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1
Zhang, Xiaobing, Xin Zhang, and Shuaihua Ye. "Calculation for Permanent Displacement of Single Slip Surface of Multi-Stage Loess Slope Based on Energy Method." Applied Sciences 12, no. 17 (August 24, 2022): 8426. http://dx.doi.org/10.3390/app12178426.
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At present, there are still some gaps in the theoretical calculation of the permanent displacement of the multi-stage loess slope under the action of earthquake. Therefore, this paper firstly uses the GEO-Studio finite element software to explore the influence of the comprehensive slope rate on the permanent displacement when the slope rate of each grade of multi-stage loess slope changes and the stage of multi-stage slope changes. The results show that it is feasible to use the comprehensive slope rate to calculate the permanent displacement of the sliding body of the multi-stage loess slope under the action of earthquake. On the basis of this conclusion, in order to simplify the calculation of permanent displacement of potential sliding soil, the other geometric parameters of the multi-stage loess slope are replaced by the comprehensive slope rate, combined with the Newmark slider displacement analysis method and energy conservation principle, and then the calculation method of permanent displacement of potential sliding soil of multi-stage loess slope under the action of earthquake is deduced. Through an example, the permanent displacement calculated by the proposed algorithm are compared with those calculated by the PLAXIS 3D software and GEO-Studio software. The results show that the permanent displacement calculated by this method is close to that calculated by the GEO-Studio software, and the difference is only 2%, and thus, the rationality of the proposed method for calculating the permanent displacement of the multi-stage loess slope under the action of earthquake is verified. The algorithm proposed in this paper provides a theoretical reference for the calculation of the permanent displacement of multi-stage loess slope under the action of earthquake.
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Malik, Moammed K., and Ibtisam R. Karim. "Slope Stability Analysis of Haditha Dam after Earthquake using Geo-Studio Software." Engineering and Technology Journal 39, no. 4A (April 25, 2021): 599–613. http://dx.doi.org/10.30684/etj.v39i4a.1909.
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The current study is designed to analyze theslope stability of Haditha damwhich is an earth-fill dam constructed on the Euphrates River in the middle-west of Iraq. Finite element modeling was used in the present study to analyze the combined seepage and post-earthquake slope stability of Haditha earth dam. The maximum water level of a steady seepage case was considered to evaluate seepage. - Three different water levels (maximum, normal, and minimum) were applied, and nine different equilibrium slope stability limits were used to analyze the upstream and downstream slopes of the dam with three horizontal maximum accelerations.The input data given to the software are the dam geometry and its material properties with the earthquake records in the year2019.The dam was investigated by considering the water in the reservoir to be at maximum, minimum and normal water levels in its actual design. It was concluded that the dam is on the safe side in terms of stability even though the change in the earthquake's conditions in Iraq.
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Tao, Gui Lan, Zi Shun Yao, Bin Zheng Tan, Cong Cong Gao, and Yi Wen Yao. "Application of Support Vector Machine for Prediction of Slope Stability Coefficient Considering the Influence of Rainfall and Water Level." Applied Mechanics and Materials 851 (August 2016): 840–45. http://dx.doi.org/10.4028/www.scientific.net/amm.851.840.
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Slope stability estimation is a complex engineering problem involving many factors. A hybrid model based on the combination of finite element software GEO-STUDIO and support vector machine (SVM) is proposed to address the problem. The study took a high slope of Jingjiang reach of Yangtze River as the research object. Several important parameters, including values of geometric and geotechnical properties of slope as well as rainfall and water level data were used to establish the finite element model for the high slope. Besides, the validity of the model was estimate using the measured data of pore water pressure. The slope stability coefficients were calculated in GEO-STUDIO environment. And the data were used as the input samples to train and test SVM model. Results show that the agreement achieved in pore water pressure between measurement and analysis using the finite element model can be considered very reasonable. And the slope stability coefficient results by SVM coincided well with that of finite element analysis. It suggests that the proposed model has the potential to be a useful tool for the prediction of slope stability coefficient considering the influence of rainfall and water level.
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Nofrizal, Nofrizal, and Septiwila Zarinda. "STUDI EKPERIMENTAL RESPON INTENSITAS HUJAN DAN TEKANAN AIR PORI TANAH PENGARUHNYA TERHADAP KERUNTUHAN LERENG." Ensiklopedia of Journal 4, no. 2 (January 24, 2022): 296–302. http://dx.doi.org/10.33559/eoj.v4i2.1067.
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Malalak is one of the youngest sub-districts in Agam Regency, the district was previously included in the administration of the district IV koto. Malalak sub-district officially separated its elf into its own sub-district on May 24, 2007. Simalaka Road (Sicincin-Malalak-Balingka) connects between Balingka nagari in district IV Koto, Malalak nagari in Malalak sub-district, and Tandikek nagari, Patamuan, Sicincin in Padang Pariaman district.This study is classified into applied research. will use soil parameter and rainfal to find out, and analyze the extent of rain characteristics on slope collapse, as well as compare the safe factors obtained using fellenius medote and Geo-studio V Software, due to disturbed soil stability or slope building rocks.In determining the value dari the safety factor of the slope by using software Geo-Slope /W obtained the value of safety factor is 0.70. The result of vibrational influence as well as the frequent rain stability of the slopes experienced a considerable decrease in the safety value of the slopes and showed that the slope conditions unstable. Analisis safety factor from research conducted on malalak road section KM 31 can be summed up a few things as follows. From the analysis obtained a definition of the factors that cause slope unstableness. From the calculation results can be that rainwater infiltration is very influential to the stability of the slope, where safety factors or FK (Safety Factor) slopes decrease along with the length of rainwater infiltration that occurs in the area especially during the soil hoarding process occurs, this can be seen from the results of geostudio analysis and fellenius method that shows reduced slope safety factors.
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Vivekananda, Sankarpana, and Chappidi Hanumantha Rao. "Probabilistic stability analysis of narasimharaya sagar earthen dam by using geo-studio software." E3S Web of Conferences 391 (2023): 01039. http://dx.doi.org/10.1051/e3sconf/202339101039.
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Since every potential failure scenario might result in significant losses in both lives and property, the construction of dams needs extensive research to ensure the safety and feasibility of these large engineering structures. In this article, the Analyses should be performed upon specifically to evaluate seepage, slope stability, and soil liquefaction of significant earthen dam. A numerical technique employing the finite element method (FEM) was used in this article. Finite element software (GEO-STUDIO 2022) was used to carry out both steady-state and transient seepage analyses and pseudo-static ground motion That deals with the present work behavior of the Narasimharaya Sagar (Gorakallu Balancing Reservoir) earthen dam which is in the earthquake prone area of Zone II (as per IS 1893-2002).Geostudio 2022’s SLOPE/W, SEEP/W, and QUAKE/W tools examine the stability characteristics slope, seepage, and earthquake (finite element modelling based software). The model with the reservoir at full capacity is initially examined using SEEP/W to identify the piezometric line, which serves as the foundation for SLOPE/W to determine slope stability. Afterwards, it is exposed to a 0.1 peak ground acceleration earthquake motion using QUAKE/W to know its dynamic stability.
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Malik, Mohammed Karim, and Ibtisam Raheem Karim. "Seepage and Slope Stability Analysis of Haditha Dam using Geo-Studio Software." IOP Conference Series: Materials Science and Engineering 928 (November 19, 2020): 022074. http://dx.doi.org/10.1088/1757-899x/928/2/022074.
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Hermansyah, Hermansyah, Irwan Irwan, Habib Satria, and Indri Dayana. "Simulation of Cofferdam Calculations Using Geo-Studio Application in Peusangan Hydropower Dam Construction." Andalasian International Journal of Applied Science, Engineering and Technology 3, no. 2 (August 6, 2023): 89–92. http://dx.doi.org/10.25077/aijaset.v3i2.82.
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Cofferdam is a building in the form of earth, stone, concrete or masonry filling and holds water, prevents flooding, provides irrigation. The building has many functions such as for agriculture, power generation, and tourist attractions. Cofferdam will also be very helpful in flood control which will control flood water so that it will not overflow excessively which endangers the surrounding community. Besides having great benefits. If the cofferdam collapses (broken) it will cause flash floods that result in casualties. Therefore the cofferdam must be designed safely and technically feasible. The research approach used in this study is a quantitative approach using the 2012 GEO-SLOPE program. The conclusions from the analysis of slope seepage and seepage stability are the Critical Safety Factors for cofferdam stability according to the results of the analysis after running SLOPE/W are 1.711 & 1.512 because it is higher than 1.5 (SNI 8460:2017 Geotechnical Requirements Design, This means that the stability of the cofferdam is safe. The modeling results show that the seepage discharge is 1.81x10-7 m3/s = 1.81x10-4 liters/sec = 15.64 liters/day which is smaller than the maximum allowable discharge of 50 liters/day. So it can be concluded that the seepage discharge is safe.
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Tan, Mengxi, and Sai K. Vanapalli. "Performance estimation of a shallow foundation on an unsaturated expansive soil slope subjected to rainfall infiltration." MATEC Web of Conferences 337 (2021): 03009. http://dx.doi.org/10.1051/matecconf/202133703009.
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In the last two decades, there has been a significant increase in infrastructure development on slopes of hilly regions of the world, due to population growth. There are many infrastructures on unsaturated expansive slopes, especially in semi-arid and arid regions. Rainfall infiltration is one of the major factors that contributes to the slope and infrastructure foundations failures on hilly slopes with unsaturated expansive soils. In the current study, a rational approach is proposed considering the combined influence of the foundation-slope behavior based on the principles of unsaturated soil mechanics. This is achieved by a novel numerical modelling approach using the commercial software Geo-studio to investigate the performance of strip foundation located on the top of the unsaturated expansive soil slope subjected to various rainfall infiltration conditions. Hydro-mechanical coupling analysis is conducted to evaluate the rainfall water infiltration influence combined with slope stability analysis using limit equilibrium method. Comparisons are made between both the foundation bearing capacity, slope stability before and after rainfall water infiltration. Different failure mechanisms of the foundation and slope system are presented with and without foundation loading for various rainfall scenarios. Results summarized in this paper are helpful for the geotechnical engineers for understanding the performance of shallow foundations on unsaturated expansive soil slopes considering the influence of rainfall infiltration conditions.
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Pan, Haize, Rong Qin, Ting Mao, and Mengjie Chen. "Considering the Effect of Reservoir Water Level Lifting on the Slope Stress Analysis of Seepage Field and Stress Field Coupling." Open Construction and Building Technology Journal 8, no. 1 (December 31, 2014): 343–50. http://dx.doi.org/10.2174/1874836801408010343.
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This paper analyzes the slope stress analysis of seepage-stress field under the condition of water lifting of reservoir slope, taking a practical reservoir slope project for example, on the basis of investigation and study of the geological environment, the soil geology model of the reservoir slope is established. On the basis of interaction calculation module of the fluid structure in the software Geo-Studio and Biot theory, finite element method of seepage-stress field coupling is applied to study the variation of stress field of the reservoir slope mainly with strong weathering argillaceous sandstone and marl, on the condition that reservoir water level rise and fall. The maximum principal stress is mainly compressive stress, the tensile stress just distributes near the top of the slope; the minimum principal stress is mainly compressive stress.
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Zhao, Ya. "The Influence of Rainfall and Evaporization Wetting-Drying Cycles on the Slope Stability." Advances in Meteorology 2022 (July 9, 2022): 1–8. http://dx.doi.org/10.1155/2022/5775424.
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The decay of soil strength and the change of soil infiltration characteristics caused by the dry and wet cycle effect generated by the rainfall-evaporation process are important factors that induce slope instability. How to consider the effect of soil strength decay and water-soil characteristic curve hysteresis effect on transient stability change of slope is the key to solve this problem. In this paper, transient stability analysis of slopes considering soil strength decay and water-soil characteristic curve hysteresis is carried out based on Geo-Studio. The results of the study showed that the change of transient safety factor of the slope caused by rainfall-evaporation dry and wet cycle process has an overall decreasing trend and the safety factor decreased by 43% compared to the initial state. The seepage characteristics of the rainfall-evaporation dry-wet cycle have certain regularity. The location of slope measurement points has a greater influence on the magnitude of the pore pressure change: foot of slope > middle of slope > top of slope. Also, there is a significant response hysteresis in the change of pore pressure with increasing depth at the same location. The rainfall intensity has a certain influence on the change of slope safety factor, but its influence is not obvious when the rainfall intensity exceeds a certain amount.
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海, 强., and 玉卓 王. "基于Geo-studio的金池街滑坡稳定性分析." 工程技术与管理 4, no. 15 (January 8, 2021): 122. http://dx.doi.org/10.26549/gcjsygl.v4i15.6177.
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滑坡作为影响人类生命财产安全的重大地质灾害之一，对其的防治具有重要的意义，边坡的稳定性分析为滑坡的防治提供了重要的理论依据。论文以中国绵阳市梓潼县观义镇红旗社区金池街滑坡为工程实例，研究了Geo-Studio软件中SLOPE/W模块在滑坡稳定性分析中的应用。论文采用SLOPE/W模块中Morgenstern-Price、Janbu、Bishop和Sarma法四种计算方法中Morgenstern-Price和Janbu两种方法，分别针对天然及暴雨两种工况对滑坡进行稳定性计算。计算结果表明，利用Geo-Studio软件对边坡进行稳定性分析是可行的，且该软件还具有众多独特的优点。
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海, 强., and 玉卓 王. "基于Geo-studio的金池街滑坡稳定性分析." 工程技术与管理 4, no. 15 (January 8, 2021): 122. http://dx.doi.org/10.26549/gcjsygl.v4i15.6177.
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滑坡作为影响人类生命财产安全的重大地质灾害之一，对其的防治具有重要的意义，边坡的稳定性分析为滑坡的防治提供了重要的理论依据。论文以中国绵阳市梓潼县观义镇红旗社区金池街滑坡为工程实例，研究了Geo-Studio软件中SLOPE/W模块在滑坡稳定性分析中的应用。论文采用SLOPE/W模块中Morgenstern-Price、Janbu、Bishop和Sarma法四种计算方法中Morgenstern-Price和Janbu两种方法，分别针对天然及暴雨两种工况对滑坡进行稳定性计算。计算结果表明，利用Geo-Studio软件对边坡进行稳定性分析是可行的，且该软件还具有众多独特的优点。
13
Guo, Ying, Yating Du, Wei Shan, Mengdi Liu, and Chengcheng Zhang. "Numerical Analysis on the Stability of Sandstone-Covered Mudstone Cutting Slopes Considering Rainfall Infiltration." Applied Sciences 13, no. 3 (January 31, 2023): 1802. http://dx.doi.org/10.3390/app13031802.
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Landslide caused by rainfall are easily produced when excavating conduct in sandstone-covered mudstone strata. The expansion project of the Heishan Village to Jixi section of Dan-A Highway is used as an example to study the formation and damage mechanism of rainfall-induced landslide in sandstone-covered mudstone cutting slope. Finite element numerical is used to analyze the stability of the slope by using Geo-Studio and ANSYS software for the three different rainfall-influencing factors of rainfall intensity, duration and rainfall form. The study indicates that rainfall time and intensity will decrease the stability of the cutting slope, and that the effect of rainfall on the slope is lagging behind. When rainfall intensity is 80 mm, rainfall duration is 1 d, and stagnation is 5 h, the slope instability is in the critical state. The front slope toe is the first unstable part in the process of slope instability. Rock and artificial construction are important reasons for this phenomenon.
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Wang, Nian Qin, Bo Han, Xiao Ling Liu, and Zheng Yu. "Study on Infiltration Characteristics and Stability of Excavated Loess Slope in an Industry Site." Advanced Materials Research 1035 (October 2014): 12–17. http://dx.doi.org/10.4028/www.scientific.net/amr.1035.12.
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In industrial construction of loess area, rainfall is one of the important factors inducing excavated slope instability. Take an industry site excavated loess slope in northern Shaanxi for example, using Geo-studio in steady flow state to analyze infiltration characteristics and stability of a loess slope. The results show that: (1) The influence of the X direction maximum locate at the free face of slope foot, Y direction maximum locate at the top of slope. (2) The upper slope larger permeability coefficient, the lower the permeability coefficient is smaller, aquiclude almost have no permeability, shows that the slope is loose soil, particles with skeleton structure, easy water infiltration, the farther down the soil compaction degree is high, the worse the infiltration capacity into the water, the permeability coefficient is smaller. (3) It is easy to produce water flow in aquiclude and slope toe. Then, it soften soil, reduced the shear strength of the soil. It can explain that aquiclude and free face on slope foot always is the structure plane shear outlet of slope.
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Gupta, Alinda, Md Azijul Islam, and Md Jobair Bin Alam. "Numerical Evaluation of Slope Stability based on Temporal Variation of Hydraulic Conductivity." E3S Web of Conferences 382 (2023): 24003. http://dx.doi.org/10.1051/e3sconf/202338224003.
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Slope failure is a common phenomenon all over the world on both man-made and natural slopes. Prolonged rainfall is one of the climatic factors which is largely responsible for slope failure. During heavy and prolonged rainfall, a part of the rainwater infiltrates through the soil and seeps into the slope. The infiltrated water lowers the matric suction and increases the porewater pressure. Eventually, the generated porewater pressure decreases the strength of the soil which results in slope failures. To evaluate the effect of rainwater seepage on slope stability, it is necessary to investigate the hydraulic conductivity of the slope soil. The objective of this study is to evaluate the effect of hydraulic conductivity on slope failure mechanisms. A finite element analysis of slope stability was conducted using Geo-Studio software. A numerical model was developed and calibrated with field monitoring data. The field monitoring data included the observation of hydraulic conductivity using a Guelph Permeameter. Afterward, the temporal variation of rainfall and hydraulic conductivity was incorporated into the SEEP/W program and the consequent changes in slope stability were evaluated in SLOPE/W. From the numerical analysis, with the identical strength parameters of the soil, different factors of safety were observed when the slope sections retain different hydraulic properties. Based on the numerical analysis, it was observed that hydraulic conductivity greater than 4×10-6 cm/s leads to slope failure. Periodic monitoring of hydraulic conductivity in the field may provide deep insight into rainfall-induced slope failures.
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Yan, Tiesheng, Jun Xiong, Longjian Ye, Jiajun Gao, and Hui Xu. "Field Investigation and Finite Element Analysis of Landslide-Triggering Factors of a Cut Slope Composed of Granite Residual Soil: A Case Study of Chongtou Town, Lishui City, China." Sustainability 15, no. 8 (April 21, 2023): 6999. http://dx.doi.org/10.3390/su15086999.
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Landslides caused by excavations and precipitation events are widespread types of slope failures in southwest Zhejiang, China, in areas with granite residual soil. Investigations of the effect of high precipitation on the hydrological response, stability, and evolutionary mechanism of cut slopes in granite soil areas are lacking. The characteristics of historical landslides in Chongtou Town in southwestern Zhejiang were summarized, and a typical slope was selected for analysis. The hydraulic and mechanical properties of the residual soil and fully weathered granite were tested, and the surface displacements on the slope were monitored. Geo-studio was utilized to establish a coupled seepage-deformation model to validate the numerical method and investigate the landslide-triggering factors of the cut slope. The results showed nearly all historical landslides in Chongtou Town were triggered by precipitation events, and the slide bodies consisted of residual soil and fully weathered granite with similar geotechnical properties. The simulated and measured horizontal displacements were in good agreement, indicating the reliability of the established model and parameters. The stability coefficient decreased with an increase in the gradient or height of the cut slope. The critical height values were 5.3 m, 5.5 m, 5.7 m, 6.0 m, and 6.3 m at slopes of 60°, 65°, 70°, 75°, and 80°, respectively. Long-term torrential rain and short-term high-intensity precipitation events are likely to trigger landslides when the precipitation event lasts longer than 26 h and 78 h, respectively. The landslide formation includes four stages: slope evolution, formation of unloading zone at slope foot, migration and loss of soil particles, and instability of the cut slope. The findings can be used to prevent and manage landslides on cut slopes in areas with granite residual soil.
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Wang, Lei, Yuequan Shang, Jun Zheng, and Yingqiu Zhang. "Temporary Confined Water-Induced Landslide in the Binary Structure of a Gentle Slope: A Case Study of the Fanshantou Landslide." Water 13, no. 5 (February 25, 2021): 596. http://dx.doi.org/10.3390/w13050596.
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With the increase in rainfall, landslides occur on many gentle slopes in the mountainous areas of southeast China. Gentle slopes have a particular dual geological structure, i.e., the lower part is a gravel soil layer with good water permeability, and the surface layer is clay soil with relatively poor water permeability. Under conditions of heavy rainfall, a gentle slope with this structure is likely to collect temporary confined water. The intermittent creep of the upper slope is caused by the floating force of the temporary confined water, which causes landslide disasters. The conditions that bring about temporary confined water are related not only to the stratum structure, but also to the rainfall intensity and the initial height of the water table level. On the basis of the characteristics of the stratum of the gentle slope landslide on the front of Fanshantou Mountain, we constructed a hydrological model in GEO-STUDIO. We investigated the effect of different rainfall intensities and initial water table levels on confined water under continuous rainfall conditions and conducted a corresponding stability analysis. The results show that when both the initial water table level and the rainfall intensity are high, temporary confined water is formed rapidly, increasing the chance of a landslide disaster. The research results provide a theoretical basis for the treatment of landslides on similar gentle slopes in the mountainous areas of southeast China.
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Yuan, Yu Lin, and Yun Feng Peng. "Analysis for the Seepage Stability of the Upstream Cofferdam of One Hydropower Station." Applied Mechanics and Materials 441 (December 2013): 286–90. http://dx.doi.org/10.4028/www.scientific.net/amm.441.286.
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According to the geological conditions of upstream cofferdam and foundation of the hydropower station, analysis for the seepage of the upstream cofferdam used SEEP/W module of Geo-studio software. Analysis for the stability used SLOPE/W module with Swedish circle method and Bishop method. Safety factor of the upstream and downstream in different conditions was obtained. The results show that the design of the upstream cofferdam was reasonable, and it will provide theoretical basis for Seepage control design of cofferdam.
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Hussain Maula, Baydaa, and Ling Zhang. "Liquefaction-Induced Ground Deformation of Slopes Using Geostudio2007 Software Program." Advanced Materials Research 261-263 (May 2011): 1303–8. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.1303.
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Liquefaction phenomenon which has produced severe damage all over the world was studied under earthquake record of 0.5g; one of the major effects of liquefaction is lateral spreading. Lateral spreading occurs in sloping grounds and can cause serious damage to structures and lifelines. The objective of this paper is to study the effect of earthquake shaking on soils and slope stability using Geo Studio software 2007. The applicability of the analysis is demonstrated by analysis various slope and embankments subjected to earthquake shaking. This study investigated the effect of embankment slope angle and its geometry on liquefaction. Pore water pressure can be increased by 100% to 35% as β ranged from 35ͦ to 45ͦ respectively, it can see that liquefaction zone induced by earthquake can eliminate as flattering slope and mean while reduced lateral speared displacement. Three case studies are providing to evaluation cyclic stress ratio (CSR) due to earthquake and lateral speared for soils.
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Yu, Shuyang, Xuhua Ren, Jixun Zhang, Haijun Wang, Junlei Wang, and Wenwei Zhu. "Seepage, Deformation, and Stability Analysis of Sandy and Clay Slopes with Different Permeability Anisotropy Characteristics Affected by Reservoir Water Level Fluctuations." Water 12, no. 1 (January 10, 2020): 201. http://dx.doi.org/10.3390/w12010201.
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Evaluation of slope stability under water level fluctuations is an important topic in the Three Gorges Reservoir (TGR) in China. However, most of the previous studies regarded slope soil as isotropic material, or only considered the influence of anisotropy ratio (kr = kx/ky) but ignored the anisotropy direction (α). Meanwhile, the pore pressure–stress coupling was rarely considered in the previous numerical simulations. In the present study, the SIGMA/W and SLOPE/W modules in Geo-studio are utilized to carry out the numerical simulation of Caipo slope under the drawdown of the reservoir water level, and the anisotropy ratio (kr) as well as the anisotropy direction (α) of two kinds of soils (clay and sand) are included. Results show that the anisotropy ratio kr and anisotropy direction α decrease the infiltration capacity of the soil, which increases the infiltration line hysteretic elevation (ILHE) as well as maximum horizontal displacement (MHD), and reduces the minimum safety factor (MSF). The slope toe firstly fails with the drawdown of water level. The influence of reservoir water level drop on seepage, deformation, and stability of the sand slope is less than that of the clay slope. For the sandy soil slope, it is not only necessary to consider the influence of kr, but also the influence of α. For the soil slope, we can only consider α in order to simplify calculation.
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Yu, Shuyang, Xuhua Ren, Jixun Zhang, Haijun Wang, and Zhitao Zhang. "Sensibility Analysis of the Hydraulic Conductivity Anisotropy on Seepage and Stability of Sandy and Clayey Slope." Water 12, no. 1 (January 18, 2020): 277. http://dx.doi.org/10.3390/w12010277.
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Evaluation of slope stability under rainfall is an important topic of Geotechnical Engineering. In order to study the influence of anisotropy ratio (kr = kx/ky) and anisotropy direction (α) on the seepage and stability of a slope, the SEEP/W and SLOPE/W modules in Geo-studio were utilized to carry out the numerical analysis of a homogeneous slope in Luogang District, Guangzhou City, China, which is based on the theory of unsaturated seepage and stability. Two kinds of soils (clay and sand) were included. Results show that: For sandy soil slope, the increase of kr promotes the rainfall infiltration, and the decrease of α prevents the rainfall infiltration. The maximum water content of the surface (MWCS) reaches maximum with the increase of kr and α. The rising height of groundwater (RHG) is −3–4 m and the safety factor (SF) is 1.3–1.7. For clayey soil slope, variations of kr and α have little impact on the seepage characteristics and slope stability. The MWCS remains almost the same. The rainfall infiltration depth (RID) is 0.5–1 m and the SF is about 1.7. Therefore, for sandy soil slope, it is not only necessary to consider the influence of kr, but also the influence of α. For clayey soil slope, it can be treated as isotropic material to simplify calculation.
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刘, 恒材. "Study on Stability of East Side Slope of Shengli East No. 2 Mine Based on Geo-Studio Numerical Software." Advances in Geosciences 10, no. 07 (2020): 622–28. http://dx.doi.org/10.12677/ag.2020.107061.
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Arya, I. Wayan, I. Wayan Wiraga, I. G. A. G. Surya Negara, I. Nyoman Ramia, and I. Made Wahyu Premana. "Rock slope stability analysis in Melasti Beach area – Ungasan, Bali." International research journal of engineering, IT & scientific research 9, no. 3 (May 18, 2023): 82–90. http://dx.doi.org/10.21744/irjeis.v9n3.2319.
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Melasti Beach is one of the main tourist attractions developed by the Bali Government. This beach is located in the southern area of Bali, precisely in Ungasan village, Badung Regency, Bali. At the moment, the region administrator is constructing a tourism facility by excavating a rock mass near the beach. Therefore, to avoid damage to nearby shops and beach facilities, a study is needed to be conducted about the safety of the rock mass that is being excavated. Direct observation of the rock mass and rock mass classification is conducted to obtain the physic and mechanical characteristics of the rock. To do the stability analysis of the slope, Geo-Studio 2012 software is used by inputting the data obtained from the field and laboratory data. The result of this study is a mass rock in Melasti Beach is classified as limestone which has a Fair rock classification and the factor of the safety of the rock slope/cliff is 1.631 which means the cliff is safe and is no need to build an extra reinforcement on the slope/cliff.
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Sun, Yongshuai, Ke Yang, Ruilin Hu, Guihe Wang, and Jianguo Lv. "Model Test and Numerical Simulation of Slope Instability Process Induced by Rainfall." Water 14, no. 24 (December 7, 2022): 3997. http://dx.doi.org/10.3390/w14243997.
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Due to rainfall infiltration, slope instability becomes frequent, which is the main reason for landslide disasters. In this study, the stability of slope affected by rainfall was analyzed using an indoor model test and geo-studio simulation method, and the variation law of phreatic line, seepage field, the most dangerous sliding surface, and safety factor with time were studied under rainfall infiltration. Research results showed that under the effect of rainfall, the slope failure presented a typical traction development mode. With the increase of time, the phreatic line of the slope kept rising, the water head keeps increasing, the seepage depth in the slope became deeper, and the slope stability worsened until the slope was damaged. The water head height decreased gradually from the slope left boundary to the right, and the water head width decreased gradually. The soil at the slope back edge was damaged, and the sliding soil accumulated at the slope foot, forming a gentle slope, which increased the shear strength of the slope, making the slope finally reach a stable state. In this process, the overlying soil changed from an unsaturated state to a saturated state, the pore water pressure and soil pressure increased, and then the slope was damaged, both of which decreased. Under high rainfall intensity, the slope was damaged, the soil in the slope was rapidly saturated, and the time required to produce the sliding area was short. When the rainfall intensity was the same, the smaller the slope angle was, the smaller the safety factor was. When the slope angle was the same, the greater the rainfall intensity was, the smaller the safety factor was.
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Mao, Wei, E. Chuan Yan, Yang Bing Cao, and Sheng Lai Jiang. "Simulation of Landslide Seepage Field with the Action of Reservoir Water Fluctuations." Applied Mechanics and Materials 71-78 (July 2011): 4802–7. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.4802.
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Taking a landslide in the three gorges reservoir area as an example and considering the seepage field in different time periods with rise and fall of reservoir water level of the eight conditions, we use GEO-STUDIO / SEEP module to establish a seepage model and to calculate the distribution of seepage. The results showed that: the groundwater saturation line appears in the back-phenomenon during a certain range of slope in the rising water level, saturation line was concave shape, and with the rate of increase in water level increased and that concavity gradually increase; the groundwater saturation line appears in the downstream phenomenon during a certain range of slope in the drawdown water level, saturation line was convex shape, and with the rate of decline in water level increased and that convexity increases. The effective simulation studies of the greatly and cyclical fluctuations of water level under the slope seepage field has a certain reference meaning to the landslide control in the reservoir water level fluctuations about reservoir bank landslide.
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Sholeh, Moch, M. Suhartono, and Nur Anisfi Choirini. "ANALISIS STABILITAS TUBUH BENDUNGAN PADA BENDUNGAN UTAMA PROYEK WADUK BENDO PONOROGO." PROKONS Jurusan Teknik Sipil 13, no. 2 (January 16, 2020): 83. http://dx.doi.org/10.33795/prokons.v13i2.189.
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The work of embankment in the main dam with an upright core consists of 5 pile zones: the core, filter, random, rock, and rip-rap. There was difference in planning and implementation of embankment filling. Random and rock used quarry Bondrang in planning but blasting upstream of the excavated material was used in implementation. This difference is because there are social problems with the community surrounding the Bondrang quarry. The purpose of this thesis is to repair the dam foundation, to find out the seepage discharge, to analyze the possibility of piping, to determine the safety factor of slope stability in the dam, and to determine RAB Maindam of Bendo Dam Project Ponorogo. The required data were of the geologic of the dam foundation, embankment materials, cross-sectional images of the dam body, and dam technical. Repairing the foundation using 3 methods : curtain grouting, consolidated grouting and blanket grouting; and for seepage calculations using the Cassagrande formula; to calculate safety figures using the Fellenius method and use the Geo-Studio 2012 application, the Seep / W program to find out the seepage discharge and the Geo-slope program to find out slope stability in maindam. The analysis resulted in 3 methods of repairing dam: curtain grouting with a depth of 39.83m, consolidated grouting with a depth of 5m, and blanket grouting with a depth of 15m; seepage discharge capacity <1% passing water average meaning safe; velocity seepage (7,3816 x 10-7m/sec) < velocity critical (0,004017m/sec) and 11,97 > 4 meaning safe for piping; >1.5 slope stability in various conditions without earthquake load meaning safe; 1.2 slope stability in various conditions with earthquake load meaning safe; the estimated cost IDR290,388,884,070.62 for main dam
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He, Yuqiong, Bo Li, and Xuan Du. "Soil Slope Instability Mechanism and Treatment Measures under Rainfall—A Case Study of a Slope in Yunda Road." Sustainability 15, no. 2 (January 10, 2023): 1287. http://dx.doi.org/10.3390/su15021287.
Full textAbstract:
The unique geological conditions in Yunnan make it likely for landslides to occur there. For the purpose of exploring the soil slope instability mechanism, this paper takes a slope in Yunda Road, Chenggong, Kunming, as case study and establishes a slope model utilizing FLAC 3D coupled with Geo-studio software. The displacement, strain and deformation rate of the slope under the condition of rainfall are simulated, and the influence of rainfall and rainfall duration on rainfall infiltration is analyzed. The results indicated the following: (1) The effective stress on and shear strength of slope soil at the foot of the slope gradually decreased under rainfall, resulting in the loosening of the slope soil and slip at the foot of the slope. This affected the stability of the upper slope which, in turn, reduced the stability of the whole slope; (2) When the duration of rainfall reached 72 h, the slope stability coefficient Fs = 0.88, indicating a failure state. The increments of principal stress and shear stress at the foot of the slope were the largest, and the strain speed was the fastest, with the maximum values of principal stress and shear stress reaching 0.412 and 0.579, respectively; (3) The maximum total displacement was 2.177 m at the foot of the slope, the maximum vertical Z-axis displacement was 1.673 m in the negative direction of the Z-axis, and the soil at the foot of the slope was 0.6 m in the positive direction of the Z-axis. Our simulation results were consistent with the actual failure of the slope. After analyzing the slope mechanism and adopting targeted treatment measures, the slope was subjected to four rainfall cycles without any sign of landslips, indicating that the effect of our interventions was favorable.
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Siregar, Gerald Guntur Pandapotan. "PENGARUH RENCANA PENINGKATAN VOLUME TAMPUNGAN TERHADAP STABILITAS TUBUH BENDUNGAN KEDUNG OMBO." Jurnal Teknik Sipil 17, no. 2 (April 10, 2023): 67–77. http://dx.doi.org/10.24002/jts.v17i2.5881.
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The strategy to meet the water demands of Semarang and Demak Regencies involves enhancing the storage capacity of the Kedung Ombo Dam. This augmentation will inevitably alter the typical water level, thereby affecting the stability of the dam structure as it bears a greater load. Furthermore, the Kedung Ombo Dam, which is nearly 32 years old, necessitates re-evaluation since it lacks the full benefit of contemporary design methods. This study is confined to examining the slope stability, both static and pseudostatic, at a steady state flow, with the highest normal water level elevation (elevation +92.00) as the focal point. The slope stability analysis was conducted via the finite element method using the Slope/W in Geo-Studio software. The outcome of the static slope stability analysis indicates that the safety factor of the Kedung Ombo Dam body remains above the minimum allowable safety factor. In the pseudostatic analysis, the safety factor during the Operating Basic Earthquake (OBE) remains above the minimum allowable safety factor. However, during the Maximum Design Earthquake (MDE), the safety factor demonstrates a value that is lower than the minimum allowable safety factor. Nevertheless, the analysis of fixed displacement or permanent deformation reveals that the maximum settlement that occurs during the MDE earthquake does not exceed 50% of the available freeboard.
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Imani, Fiorentina Novella Fajri, Gerard Aponno, and Akhmad Suryadi. "ANALISIS STABILITAS TUBUH BENDUNGAN PADA BENDUNGAN SEMANTOK KABUPATEN NGANJUK PROVINSI JAWA TIMUR." Jurnal JOS-MRK 2, no. 4 (December 15, 2021): 22–27. http://dx.doi.org/10.55404/jos-mrk.2021.02.04.22-27.
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Bendungan Semantok merupakan bendungan urugan tipe zonal (inti vertikal) dengan 6 zona timbunan. Bendungan Semantok merupakan prasarana pengairan yang mempunyai resiko sangat tinggi jika mengalami kegagalan. Oleh karena itu, penelitian ini memiliki tujuan untuk mengetahui besar kapasitas debit rembesan, potensi kemungkinan terjadinya erosi internal, faktor keamanan stabilitas lereng (kondisi tanpa dan dengan beban gempa), spesifikasi dan metode pelaksanaan serta perhitungan rencana anggaran biaya pada pekerjaan galian dan timbunan main dam. Data yang diperlukan diantaranya adalah data teknis bendungan, data tanah asli, data material timbunan tubuh bendungan, dan gambar desain bendungan. Penggambaran flownet dibuat dengan metode grafis lalu dilanjutkan dengan perhitungan rembesan menggunakan rumus Cassagrande dan menggunakan program Geo-Studio SEEP/W 2012. Perhitungan faktor keamanan stabilitas lereng menggunakan program Geo-Studio SLOPE/W 2012 dengan metode Fellenius. Dari hasil perhitungan diperoleh kapasitas debit rembesan yang terjadi < 1% dari rata-rata debit sungai yang masuk ke dalam waduk (0,02080 m3/detik) sehingga aman dari rembesan. Faktor keamanan terhadap erosi internal memiliki nilai 4,384 > 4 sehingga aman terhadap erosi internal. Stabilitas lereng dianalisis dalam berbagai kondisi muka air dengan dan tanpa beban gempa menghasilkan beberapa angka FK di bawah FK minimum sehingga perlu ditambah perkuatan berupa geosintetik jenis geogrid. Alat berat yang dibutuhkan adalah Excavator, Excavator+Breaker, Dump Truck, Baby Roller, Sheep Foot Roller, Smooth Drum Roller, Vibrator Roller, dan Bulldozer dengan jumlah yang disesuaikan dengan kebutuhan di lapangan. Biaya yang dibutuhkan adalah sebesar Rp. 527.835.264.000,00 untuk pekerjaan galian dan timbunan main dam Bendungan Semantok.
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Hussain, Ruqiya Abed, and Asmaa Al-samarrae. "Theoretical Analysis and Development of an Artificial Neural Network Model to Evaluate Earthen Dam Slope Stability." Tikrit Journal of Engineering Sciences 29, no. 4 (November 5, 2022): 1–9. http://dx.doi.org/10.25130/tjes.29.4.1.
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In the design of earth dams, it must be considered that the water leakage through the earth dam generates upward and pore pressure, in addition to leakage forces that cause internal erosion, which has a direct influence on the structural stability of this system. Also, the rising and dropping in the water level has a direct effect on the stability of the dam's face slope. One way to solve these issues is the installation of a core or a horizontal water drainage system. The present study relied on the GEO-Studio computer tool to evaluate cross-sectional models of earthen dams by determining the safety factor under different situations represented by a change in filter type, and the flow state as a result of raising and lowering the water level at the dam reservoir and the full fill condition of the dam reservoir. The research found that the existence of a core substantially contributed to improving the safety coefficient for the case of rising the water level (2m) and rapidly rising by assigning it the greatest safety coefficient values. The absence of a filter had an opposite influence on the safety coefficient by decreasing it. Also, the factor of safety for the downstream slope was affected by less than 5% for different flow conditions, compared with the higher effect generated by the upstream slope. Furthermore, an artificial neural network model with an accuracy ratio of more than 97% was developed for the predicted safety factor.
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Danoosh, Alaa Hu, and Maysam Th. Al-Hadidi. "Numerical simulation to the effect of applying rationing system on the stability of the Earth canal: Birmana canal in Iraq as a case study." Journal of the Mechanical Behavior of Materials 31, no. 1 (January 1, 2022): 729–38. http://dx.doi.org/10.1515/jmbm-2022-0216.
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Abstract Extreme conditions will cause the water level of high fill canal segment to change suddenly, which will affect the velocity and pore pressure of the slope. A 9 km irrigation earth canal in the city of Alsyahy, 15 km away from Al-Hilla city, and branching off from the left side of Shatt Al-Hilla at 57 km, was studied. The aim of this work is to study and analyze the effect of rationing system on the Birmana earthen canal during rapid drawdown case. Finite element modeling with Geo-Studio software was used in the present study to analyze the combined seepage and slope stability for three cycles. The resulting minimum safety factor obtained from the analysis using the saturated and unsaturated soil model was found to be 1.161, 1.142, 1.159, and 1.2 from the Janbu, Bishop, Morgenstern-Price, and Spencer methods, respectively. The factor of safety (FOS) values in three cycles are less than the required value. Finally, the FOC decreased by 66% from its value before the rationing system was applied, the area of canal and slip surface increased by 77 and 14%, respectively, due to the applied rationing system. These changes led to an irregular water distribution along the canal, in addition to a reduction in road width.
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Wu, Yuedong, Xiangyu Zhou, and Jian Liu. "Long-Term Performance of the Water Infiltration and Stability of Fill Side Slope against Wetting in Expressways." Applied Sciences 12, no. 12 (June 7, 2022): 5809. http://dx.doi.org/10.3390/app12125809.
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Different settlements and instabilities of unsaturated subgrade subjected to wetting have been paid increasing attention in the southeast coastal areas of China. However, the treatments are costly when they are used in engineering. In addition, the long-term performances of the treatments are unclear. Based on seepage theory for unsaturated soils, a novel subgrade using a capillary barrier was proposed in this study to reduce the different settlements and stabilities. Compared with previous studies, a capillary barrier was merely applied in the landfill. The long-term performance and feasibility of a capillary barrier applied in a tilted subgrade slope is worthy of study, particularly in humid climates. Using Geo-Studio, the feasibility was verified by comparing a conventional subgrade with a subgrade using a capillary barrier in southeast coastal areas in terms of pore-water pressure, water content, settlement, and the safety factor. The numerical results showed that the subgrade using a capillary barrier could provide significant improvements in the performance of reducing the impact of pore-water pressure distribution it suffered from, so as to lead to smaller different settlements. The vertical settlement of the pavement using a capillary barrier over a 1 year period was 1 cm. Compared with a conventional subgrade, the settlement fell by 94%, and the safely factor increased by 15% for the subgrade using the capillary barrier.
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Wahyudi, Rofi, and Dian Hastari Agustina. "Pengaruh Kadar Air Terhadap Kestabilan Lereng." SIGMA TEKNIKA 5, no. 1 (June 29, 2022): 151–57. http://dx.doi.org/10.33373/sigmateknika.v5i1.4153.
Full textAbstract:
Permukaan tanah sebagian besar memiliki elevasi yang berbeda. Perbedaan elevasi ini dapat disebabkan oleh mekanisme alam maupun rekayasa manusia. Lereng adalah permukaan tanah (material) terbuka yang membentuk sudut tertentu dengan bidang datar (horisontal). Penelitian ini dilakukan untuk mengetahui stabiltas lereng dengan menggunakan software Geo-Studio Slope/W. Metode Bishop digunakan untuk menganalisis kestabilan lereng dengan pemodelan lereng berupa tinggi lereng 5 meter, bidang datar bawah lereng 15,14 meter bidang datar atas 9 meter dan sudut kemiringan lereng 35 derajat. Lereng berupa tanah timbunan dengan data propertis yang diperoleh dari penelitian laboratium uji pemadatan standar (Standard Proctor Test) dan uji geser langsung (Direct Shear Test) dengan nilai kadar air tanah timbunan yang bervariasi -4%OMC, -2%OMC, OMC, +2%OMC dan +4%OMC . Hasil analisis kadar air -4%OMC diperoleh nilai faktor keamanan sebesar 1,725, kadar air -2%OMC diperoleh 1,276, kadar air OMC diperoleh sebesar 1,226, kadar air +2%OMC diperoleh sebesar 0,388, dan kadar air +4%OMC sebesar 0,289. Nilai - nilai faktor keamanan yang telah diperoleh menunjukkan semakin tinggi nilai kadar air pada tanah timbunan tersebut semakin rendah nilai faktor keamanan. Sehingga dapat disimpulkan jika nilai kadar air sangat berpengaruh terhadap kestabilan lereng
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Chen, Mo, Changlei Dai, and Yang Li. "Comparative analysis of seepage simulation for embankment in cold area during ice flood season and non-ice flood season." MATEC Web of Conferences 246 (2018): 01121. http://dx.doi.org/10.1051/matecconf/201824601121.
Full textAbstract:
Influenced by meteorological and environmental factors, ice flood is easy to occur in cold areas, causing the flood level to rise substantially and threatening the safety of embankments. Based on the analysis of the influencing factors of the seepage of the dike in the cold region, the seepage simulation model of the dike is constructed and solved by the SEEP/W module of Geo-studio software. The seepage of the Dike Section in the ice flood season and non-ice flood season under the scenario of 100-year flood level is compared and analyzed. The results show that, (1) The seepage path of non-ice flood dike mainly passes through the base layer of the dike, and the seepage path of the dike is affected by the frozen shell during the ice flood season, and the seepage path of the dike mainly passes through the frozen shell. (2) The maximum velocity of Dike Seepage in the season of ice flood is higher than that in non-ice flood season, which is easy to cause piping and collapse. (3) the maximum gradient of the embankment during the flood season has also increased, exceeding the allowable slope value of the project. During the season of ice flood, the embankment is unstable, and the embankment protection should be strengthened during the flood season.
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Mesa Lavista, Milena, José Álvarez Pérez, and Jorge Humberto Chávez Gómez. "EVALUACIÓN DEL FACTOR DE SEGURIDAD EN TALUDES DE TERRAPLENES CARRETEROS ALTOS ANTE CARGA SÍSMICA." Revista de Ingeniería Sísmica, no. 103 (September 17, 2020): 1–17. http://dx.doi.org/10.18867/ris.103.489.
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Cuando se construye un terraplén carretero, una de las variables analizadas en el diseño es la obtención del factor de seguridad para determinar la estabilidad y seguridad de los taludes. Este diseño se realiza haciendo uso de un análisis estático y, en casos más específicos y aislados haciendo un análisis sísmico. En el presente trabajo se realiza un estudio del comportamiento del factor de seguridad en taludes de terraplenes carreteros altos frente a la solicitación sísmica. Para llevar a cabo el presente estudio se realizó un diseño de experimento 32. En el diseño de experimento se varió la altura del terraplén en tres niveles y el nivel de sismicidad, construyendo acelerogramas a partir de los espectros de diseño considerando los parámetros de la sección 3.1 del Manual de diseño de obras civiles de la comisión federal de electricidad de México. En la obtención de los resultados se empleó el método de los elementos finitos (MEF) y el método de Newmark. Como herramienta computacional se empleó el software especializado Geo-Studio con el sub-módulo para el análisis dinámico QUAKE/W, y el sub-módulo para el análisis de estabilidad SLOPE/W. Los resultados obtenidos muestran la necesidad de revisar estas obras frente al sismo sobre todo en zonas de sismicidad alta cuando su altura supere los 12 m.
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Zedan, Adnan Jayed, Marewan Ridha Faris, and Ali Kareem Bdaiwi. "Performance Assessment of Shirin Earth Dam in Iraq Under Various Operational Conditions." Tikrit Journal of Engineering Sciences 29, no. 2 (August 4, 2022): 61–74. http://dx.doi.org/10.25130/tjes.29.2.8.
Full textAbstract:
Proper dam management should be ensured regularly to avoid breaches and failure. In this study, the finite element method was used to analyse the stability of the Shirin earthen dam under various conditions. The necessary laboratory tests for soils used in the construction of the dam were carried out in the laboratories of the College of the Engineering /University of Tikrit, and these data were employed in the GEO-STUDIO program to analyse the seepage and stability of the dam. The seepage was analysed at three levels of the water lake reservoir including the highest, middle and lowest water levels. In addition, factors such as the permeability of the shell layer, the presence and thickness of the dam’s core layer, the placement of filters at the back of the dam and the exit gradient have been considered. The results have shown that by increasing the permeability of the shell layer, the exit gradient is decreased while the seepage through the dam body is increased. The presence of the dam’s core layer has a significant effect on reducing the amount of seepage through the dam’s body as the amount of seepage is reduced by (99%). Moreover, it was found that the minimum safety factor is 1.95 and it occurs after (4 days) of the rapid emptying of the reservoir, and this indicates that the upstream slope of the dams is safe during water emptying.
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Yasrifullah, Achmad, and Adriani Adriani. "THE DESIGN OF THE CONSTRUCTION OF RETAINING WALLS ON THE RIVER SLOPES OF KUIN." CERUCUK 4, no. 1 (June 7, 2021): 83. http://dx.doi.org/10.20527/crc.v4i1.3580.
Full textAbstract:
North Kuin Street, North Kuin, North Banjarmasin Subdistrict, South Kalimantan Sub-district is right on the outskirts of Kuin River. Precisely the road that is in front of the Sultan Suriansyah Mosque, where the road has experienced cracks that can potentially occur landslides. In the event of an avalanche, it will result in obstructed traffic activities on the road which also affect the economy of the surrounding community. So from that the soil retaining wall is needed to maintain the stability of the land on the outskirts of the Kuin River so that landslides do not occur.This design begins with identifying problems that occur. Next is data collection of investigations in the field and laboratory. Then the data obtained are analyzed and interpreted and then visualized in the form of stratigraphy by plotting the type of soil by the results of sondir and boring that have been interpreted. After that, check the initial condition of the slope so that the shape of the avalanche can be identified. Then proceed with calculating the forces acting on the retaining wall due to traffic loads and other loads above it to obtain carrying capacity from the ground. Then proceed with modeling and analysis using Geo Studio 2012 software to see the value of SF (safety factor). At the end of the calculation the volume and price of the work unit are calculated to obtain the amount of the budget plan (RAB). From the results of the analysis of the design of anchor plaster, it was obtained a box profile of FSP VIL steel plaster with a total length of 28 m plaster. At stake uses a steel pipe with a diameter of 91.44 cm which is set at a depth of 28 m. For slope stability with pile reinforcement obtained SF = 1.835> 1.5, it can be said to be safe. Based on the calculation of the volume and price of the work unit, this design requires a cost of Rp. 7,340,166,486, -
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Sammen, Saad Shauket, Marwah Qaddoori Majeed, and Qutaiba G. Majeed. "Stability Assessment of Zoned Earth Dam under Water Particles Fluidity Effect: Hemren Dam as Case Study." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 79, no. 2 (January 15, 2021): 27–38. http://dx.doi.org/10.37934/arfmts.79.2.2738.
Full textAbstract:
Recently the numerical modeling using finite element method is take into account as a very effective tool to investigate the desired behavior of structures in geotechnical engineering. Earth dams are a water retention structures that are normally wide constructed around the world due to its significant features. These structures may be failed due to exposure to an earthquake and this will result in disaster. The main objective of this study is to assess the slope stability and the seismic response of an earthen dam. Since the matter of seismic response is still have a considerable lack of information for earth dams as a unique structure. Hemren zoned earth dam that is located in Diyala governorate, northeast of Iraq that considered as an active seismic zone has been considered as case study. Numerical modeling has been done in this study using Geo studio software. Factor of safety was calculated with different water levels in order to evaluate the dam safety with different operation water level. The excited earthquake is Elcentro while three values of peak ground acceleration were used which are 0.2, 0.25 and 0.3 g and the duration time is scaled to 10 seconds. In addition, three key points (at the core, the shell and the foundation) that represent the dam construction material are used to evaluate the dynamic response within the dam body. The results revealed that the factor of safety is increased when the water level is increase, but in the increasing in the magnitude of factor of safety with water depths of (10 and 15) m was more than the other depth. The zone of the dam core shows a negative pore water pressure value. That leads to an increasing in effective stress at the core of the dam.
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Abbas, Intisar H., and Maysam Th Al-hadidi. "Effect of Halabjah Earthquake on Al-Wand Earth Dam: Numerical Analysis." E3S Web of Conferences 318 (2021): 01016. http://dx.doi.org/10.1051/e3sconf/202131801016.
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The Halabja earthquake occurred on 12/11/2017 in Iraq, with a magnitude of 7.3 Mw, which happened in the Iraqi-Iranian borders. This earthquake killed and injured many people in the Kurdish region in the north of the country. There is no natural disaster more dangerous than earthquake, especially it occurs without warning, great attention must be paid to the impact of earthquakes on the soil and preparing for a wave of earthquakes. Numerical modeling using specific elements is considered a powerful tool to investigate the required behavior of structures in Geotechnical engineering, and the main objective of this is to assess the response of the Al-Wand dam to the Halabja earthquake, as this dam is located in an area that has been subjected to seismic activity recently. The modeling was done through the Geo-studio program, where the seepage was analyzed during the Al-wand dam using the Seep/w program. It was verified that the dam was safe against seepage failure and then moved to the QUAKE/W (a subprogram of GEOSTUDIO, which is used for liquefaction modeling of earthquakes and dynamic loading and determines the movement and increased pressures of pore water that arise due to earthquake vibration or sudden shock loads). The program was used to analyze the effect of the earthquake on the porewater pressure, effective stresses, and displacements. Also, it is not clear that the significant impact the earthquake has on these values. Finally, the Slope/w program was used to analyze the stability of the dam and to calculate the safety factor of the dam in two ways, and the results of the analysis show that the dam is considered safe under the influence of the tremor.
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Bahrami Balfeh Teimouri, Atanaz, and Ahad Bagherzadeh Khalkhali. "Stability Control of Narmab Dam and Sensitivity Analysis of Reliability Coefficients." Civil Engineering Journal 4, no. 9 (September 30, 2018): 2197. http://dx.doi.org/10.28991/cej-03091150.
Full textAbstract:
Static and quasi-static stability analysis of embankment dams is of vital importance in different stages of dam’s design, construction and operation. The stability can be studied using different techniques which are generally analyzed through Limit Equilibrium Method. Base on this main method, the critical slip surface is selected and the shear strength required to counter the slip at the selected surface is obtained and compared with shear strength of the soil at that surface in order to obtain confidence coefficient. In the present research, the Geo-studio Slope/w software that is a geotechnical software based on finite element method and is widely used in geotechnical field, is employed in order to analyze the stability of the body and foundation of Narmab dam in Golestan province. Narmab dam is a homogeneous embankment dam with a height of 60 m, crest length of 807 m and reservoir volume of 115 million cubic meters. The confidence coefficients provided by the software are compared to the permissible confidence coefficients. Moreover, the sensitivity of the confidence coefficients values to the changes in the effective factors, adhesion and internal friction coefficient, is analyzed. The analyses were performed on 8 values (±5, ±10, ±15, ±20) of c and φ and the obtained values of confidence coefficients were compared. In addition, a comparison was made between different methods of stability analysis. According to the static and quasi-static conditions, Narmab dam is stable in all loading stages (End of Construction, First Impounding and Steady State Seepage and In general, only for the static conditions of the end of construction stage, the sensitivity of adhesion is greater than the angle of internal friction, but, in other conditions and stages, the sensitivity of friction angle has more effects.
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Mrzah, Wael Noori, Raid Aziz Mahmod, and Amer Atia Lafta. "Geotechnical Properties Study of Soil Bank Slopes for Shatt Al-Hilla, Middle of Iraq." Iraqi Geological Journal 54, no. 2F (December 31, 2021): 97–109. http://dx.doi.org/10.46717/igj.54.2f.9ms-2021-12-26.
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The central regions of Babylon Governorate, located on the Shatt Al-Hilla, suffer from problems as the collapse and erosion of its banks, increase in sedimentation in the river, which reduces the river flow efficiency and forms meanders in the river. After the reconnaissance visit to determine the meandering sites. A detailed study of the area was carried out by drilling 6 test boreholes representing three areas (Ancient Babylon, Bata-Bridge, and Al-Khusrweya), two wells on both sides of the meander at a depth of 10m for each borehole to know soil properties, bearing capacity and consolidation, and its effect on the engineering construction. Soil samples have been taken to carry out geotechnical tests. also conducted a study of banks stability for three stations, where the cross-section was monitored by the M9 device and the height of the banks from both sides by the LEVEL device, using the Geo-Studio-2021 program with soil properties and by using Bishop method the safety factor was extracted for the three stations for erosion-prone areas. it was 3.44 in Ancient Babylon, Bata-Bridge was 1.7 and Al-Khusrweya was 1.6 Under natural conditions, the average river flow level reaches it in year respectively are 27.88, 27.74, 27.33 m, above sea level. Where all the stations were safe unless the water level increased or decreased. Also, the research reached a determination of the allowable bearing capacity reaches it before the landslide.
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Morgan, Adrienne Aiken, Ana Capuano, Robert Wilson, and Lisa Barnes. "Body Mass Index Trajectory and Incident Mild Cognitive Impairment Among African American Older Adults." Innovation in Aging 5, Supplement_1 (December 1, 2021): 114. http://dx.doi.org/10.1093/geroni/igab046.436.
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Abstract Previous research suggests a decline in body mass index (BMI) among older adults is associated with negative health outcomes, including mild cognitive impairment (MCI) and incident dementia (Gao et al., 2011). However, few studies have examined BMI longitudinal trajectories and how they change after MCI diagnosis among older African Americans. To characterize trajectories of change in BMI among older African American participants with no cognitive impairment at baseline we used data from the Minority Aging Research Study, MARS (N=408, 76.5% women, mean age = 73.5, mean education = 15.0). We constructed piecewise linear mixed-effects models that included a random intercept and two random slopes. The first slope began at baseline. The second slope began at MCI diagnosis allowing for acceleration in the rate of decline after the diagnosis. The results showed BMI declined over time (B=-0.19, SE=0.04, p<.001), and there was a faster decline after MCI (additional decline, B=-0.18, SE=0.068, p=.007). In a second model controlling for age, higher education was associated with a lower BMI at baseline (B=-0.36, SE=0.092, p<.001) but slower decline before MCI (B=0.02, SE=0.006, p=.001). However, after MCI the decline of participants with higher education was faster (B=-0.06, SE=0.022, p=.003). These results suggest an accelerated decline in BMI following MCI diagnosis, with higher education related to an even faster BMI decline, possibly a consequence of cognitive reserve.
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Suardi, Iman, Puji Ariyanto, Kautsar Nafi, Sigit Ariwibowo, and Munawar Ali. "Identifikasi Bidang Gelincir Menggunakan Metode Tahanan Jenis Konfigurasi Wenner (Studi Kasus Dusun Sijeruk, Kabupaten Banjarnegara)." Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 4 (December 16, 2019): 61. http://dx.doi.org/10.20961/prosidingsnfa.v4i0.35913.
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<p><strong>Abstract: </strong>Banjarnegara is landslide prone area. This research was conducted in area landslide in Dusun Gunung Raja in 2014. This research aims to identification slip surface in research location. This research used Geo-Electrical Method of Wenner. This research use 6 track. Data processing using Res2Dinv. Based on data processing, the interpretation results obtained are clay sand layer which is an aquifer, clay layer, limestone sandstone and building debris. Based on these results it is assumed that the slip plane is a clay layer with a resistivity value of 10.50 - 35.50 Ω.m. The depth of the slip plane is between 0 - 7 meters with a slope of 7.5 ° - 60 °. The type of soil movement in the study area is multi rotational.<em></em></p><p><strong>Abstrak:</strong> Banjarnegara merupakan daerah rawan longsor. Penelitian ini dilakukan di daerah sekitar longsoran di Dusun Gunung Raja pada tahun 2014. Penelitian ini bertujuan untuk mengidentifikasi bidang gelincir pada lokasi penelitian. Metode yang digunakan pada penelitian ini yaitu geolistrik tahanan jenis dengan konfigurasi Wenner. Penelitian ini sebanyak 6 lintasan. Pengolahan data menggunakan perangkat lunak Res2Dinv. Berdasarkan pengolahan data, hasil interpretasi yang didapatkan yaitu lapisan pasir lempungan yang merupakan akuifer, lapisan lempung, batu pasir gampingan dan bekas runtuhan bangunan. Berdasarkan hasil tersebut diduga bidang gelincir merupakan lapisan lempung dengan nilai tahanan jenis 10,50 – 35,50 Ω.m. Kedalaman bidang gelincir antara 0 – 7 meter dengan kemiringan lereng sebesar 7,5° – 60°. Tipe gerakan tanah pada daerah penelitian adalah multi rotasional.</p>
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Susilo, Adi, Fina Fitriah, Sunaryo, Eng Turniningtyas Ayu Rachmawati, and Eko Andi Suryo. "Analysis of landslide area of Tulung subdistrict, Ponorogo, Indonesia in 2017 using resistivity method." Smart and Sustainable Built Environment 9, no. 4 (May 16, 2020): 341–60. http://dx.doi.org/10.1108/sasbe-06-2019-0082.
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PurposeResearch has been conducted to analyze the landslide in Banaran area, Ponorogo Regency. The landslides occurred on April 1, 2017. This study was conducted to know the subsurface conditions in the Banaran area to analyze the disaster mitigation efforts. The mitigation efforts are made to reduce the risk from landslides and possible landslides.Design/methodology/approachThe method used is the geo-electric resistivity method of Wenner–Schlumberger configuration. The research was conducted in three villages namely Banaran Village, Bekirang Village and Mendak Village.FindingsThere are 12 resistivity measuring points with a track length of 410 m and a space of 10 m. The measured resistivity range is between 1.42 Ω.m and 67.500 Ω.m. The resistivity data and the local geological maps interpreted that the rocks in the Banaran area consist of clay, tuff lapilli, volcanic breccia and andesite lava. The landslide area begins at a depth of 8–35 m below the surface which is interpreted as tuff. Also, the thickness of the landslide material and the slope is = 400 which supports the occurrence of a more prominent landslide. The results of the parameter scoring of the landslide-prone areas indicated that the research area is very vulnerable to a landslide. The results of the interpretation indicate that the geo-electric resistivity method can provide a good overview for conducting landslide analysis, that is field slippage and potential material thickness occurrence landslide.Originality/valueThis article is very specific as it attempts to discover how prone Banaran are is to landslide.
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Matinnia, Benyamin, Aidin Parsakhoo, Jahangir Mohamadi, and Shaban Shataee Jouibary. "Study of the LiDAR accuracy in mapping forest road alignments and estimating the earthwork volume." Journal of Forest Science 64, No. 11 (December 3, 2018): 469–77. http://dx.doi.org/10.17221/87/2018-jfs.
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Today, differential geographical position system and total station devices are improving the accuracy of positioning information, but in critical locations such as steep slopes and closed canopy cover, the device accuracy is limited. Moreover, field surveying in this technique is time-consuming and expensive. For this reason, remote sensing technique such as light detection and ranging (LiDAR) laser scanner should be used in field measurements. The objective of this study was to evaluate and compare precision and time expenditure of total station and airborne LiDAR in producing horizontal and vertical alignments and estimating earthwork volume of two proposed forest roads in a deciduous forest of Iran. To investigate this task, the geographical position of proposed forest roads were detected by differential geographical position system and then marked on land. Mentioned roads were taken again with Leica Total Station (LTS) on control points with same 5 m intervals from start point. Recent data served as a reference value for comparison with LiDAR measurements. The data were processed in Civil 3D, Fusion and Leica geo office software. Results showed that in comparison to field-surveyed routes by LTS, the LiDAR-derived routes exhibited a horizontal accuracy of 0.23 and 0.47 m and vertical accuracy of 0.31 and 0.66 m for road 1 and road 2, respectively. The LiDAR-derived sections every 1 m exhibited cut and fill accuracy of 2.39 and 3.18 m<sup>3</sup> for road 1 and 2.98 and 5.60 m<sup>3</sup> road 2, respectively. In this study, it was proved that the road project can be prepared faster by LiDAR than that of LTS. Therefore, high accuracy of road projection by LiDAR is useful for terrain analysis without the need for field reconnaissance.
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Menozzi, Oliva. "Extramural rock-cut sanctuaries in the territory of Cyrene." Libyan Studies 46 (August 14, 2015): 57–74. http://dx.doi.org/10.1017/lis.2015.3.
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AbstractChieti University's team in Libya has been mapping and studying the extraordinary patrimony in rupestrian architecture, looking at both funerary and sacred spaces. Particular attention has been paid to the rock-cut sanctuaries in the areas to the east (Ain Hofra/Bu Miliou areas) and to the west (Baggara and Budrag) of Cyrene, which also represent the most problematic zones for looting and vandalism. Therefore, the principal need for these areas has been to plan a project of mapping and recording that is as systematic as possible for this huge patrimony. The resulting data, coming from surveys, non-invasive geo-prospecting, laser scanning of the main monuments, diagnostic mapping of the damaged monuments, as well as from the excavations, have been recorded in a multilayer GIS. In combination with the surveys, a series of excavations have also been organised in several areas in order to have stratigraphic information from sample areas, which have been chosen on the basis of both their typology/monumentality and the degree of risk of damage and looting. These sanctuaries are generally located on the steep slopes of deep canyons, typically associated with water springs, wild landscape, chthonian cults and also, therefore, funerary areas. They are generally monumentalised and emphasised by rock-cut architecture. Among the most interesting finds are the sanctuaries of Budrag and Ain Hofra, with votive inscriptions, rocky altars and shrines. Particularly interesting is the discovery of a rocky high-relief statue of Dionysus, attesting a possible open-air sanctuary in the area of Baggara. It is a unique example of rocky sculpture in Cyrene and it could be one of the best-preserved examples from the Greek world. Distinguishable by their topography, architectonic features and distance from the town, these rocky sanctuaries attest to a reciprocal osmosis between Greco-Roman and Libyan cultural, artistic and ritual elements. The levels of hybridisation and reciprocity vary from case to case and from period to period, suggesting different degrees of Greco-Roman impact, which seem to be, generally speaking, inversely proportional to the distance from Cyrene, giving space and voice to the cults and rites of the local tribes.
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Huang, Faming, Haowen Xiong, Shixuan Chen, Zhitao Lv, Jinsong Huang, Zhilu Chang, and Filippo Catani. "Slope stability prediction based on a long short-term memory neural network: comparisons with convolutional neural networks, support vector machines and random forest models." International Journal of Coal Science & Technology 10, no. 1 (April 10, 2023). http://dx.doi.org/10.1007/s40789-023-00579-4.
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AbstractThe numerical simulation and slope stability prediction are the focus of slope disaster research. Recently, machine learning models are commonly used in the slope stability prediction. However, these machine learning models have some problems, such as poor nonlinear performance, local optimum and incomplete factors feature extraction. These issues can affect the accuracy of slope stability prediction. Therefore, a deep learning algorithm called Long short-term memory (LSTM) has been innovatively proposed to predict slope stability. Taking the Ganzhou City in China as the study area, the landslide inventory and their characteristics of geotechnical parameters, slope height and slope angle are analyzed. Based on these characteristics, typical soil slopes are constructed using the Geo-Studio software. Five control factors affecting slope stability, including slope height, slope angle, internal friction angle, cohesion and volumetric weight, are selected to form different slope and construct model input variables. Then, the limit equilibrium method is used to calculate the stability coefficients of these typical soil slopes under different control factors. Each slope stability coefficient and its corresponding control factors is a slope sample. As a result, a total of 2160 training samples and 450 testing samples are constructed. These sample sets are imported into LSTM for modelling and compared with the support vector machine (SVM), random forest (RF) and convolutional neural network (CNN). The results show that the LSTM overcomes the problem that the commonly used machine learning models have difficulty extracting global features. Furthermore, LSTM has a better prediction performance for slope stability compared to SVM, RF and CNN models.
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Salmasi, Farzin, Biswajeet Pradhan, and Bahram Nourani. "Prediction of the sliding type and critical factor of safety in homogeneous finite slopes." Applied Water Science 9, no. 7 (September 23, 2019). http://dx.doi.org/10.1007/s13201-019-1038-1.
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Abstract In this paper, the effect of soil material parameters including soil specific weight (γ), cohesion (C), angle of internal friction ($$\emptyset$$ ∅ ), and geometric parameter of slope including angle with the horizontal (β) for a constant slope height (H) on factor of safety (Fs) was investigated. Fs was considered in two scenarios: (1) slope with dry condition, and (2) with steady-state saturated condition that comprises water level drawdown circumstances. In addition, the type of slip circle was also investigated. For this purpose, the SLOPE/W software as a subgroup of Geo-Studio software was implemented. Results showed that decreasing of water table level and omitting the hydrostatic pressure on the slope consequently would result in safety factor decrement. Comparison of the plane and circular failure surfaces showed that plane failure method produced good results for near-vertical slopes only. Determination of slip type showed that for state (30° < β < 45°), the three types of failure circles (toe, slope or midpoint circle) may occur. For state (45° < β < 60°), two modes of failure may occur: midpoint circle and toe circle. For state (β > 60°), the mode of failure circle is only toe circle. Linear and nonlinear regression equations were obtained for estimation of slope safety factor.
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Rathore, Vishal. "Slope stability and factor of safety analysis on different region of soil by using geo studio slope/w software." Journal of Geotechnical Engineering, December 3, 2020. http://dx.doi.org/10.37591/joge.v7i3.4260.
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Guo, Shuangfeng, Peiwen Xu, Peng Zhang, and Shengnian Wang. "Numerical Investigation of the Anti-infiltration and Anti-Erosion Performance of Composite Layers Mixed With Polyacrylamide and Basalt Fibre for the Protection of Silt Subgrade Slopes." Frontiers in Earth Science 10 (January 27, 2022). http://dx.doi.org/10.3389/feart.2022.815602.
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In view of the failure characteristics of rainfall erosion and imbricate layered sliding of silt subgrade slopes, this paper proposes a slope surface protection technology that is a composite protection layer that combines basalt fibre for reinforcing soil and polyacrylamide for solidifying soil. The anti-infiltration and anti-erosion performances of these proposed composite layers were systematically investigated through the finite element and discrete element numerical simulation methods. Based on the optimum proportions of polyacrylamide and basalt fibre found in a series of mechanical experiments, Geo-studio software was used to simulate numerical tests of rainfall infiltration of the silt subgrade slope, and the variation laws of volumetric water content and pore water pressure at the characteristic points and the selected sections of the slope were discussed. In addition, the PFC2D particle flow program was used to develop numerical tests on the slope erosion process of the composite layers and to analyze the degree of soil erosion during the process. The influences of layer thickness on infiltration and erosion were considered. In conclusion, the results indicate that the composite layers can effectively improve the anti-infiltration and anti-erosion performances of the silt subgrade slope. This highlights that the thickness of composite layers mixed with basalt fibre can satisfy the design parameter requirements for anti-erosion performance.