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Fata, Y. A., E. Suhartanto, Hendrayanto i P. Rubiantoro. "Seepage Patterns in an Earth-Rock Fill Dam Evaluation using Electrical Resistivity Tomography (ERT) Method". IOP Conference Series: Earth and Environmental Science 930, nr 1 (1.12.2021): 012090. http://dx.doi.org/10.1088/1755-1315/930/1/012090.
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Abstract Seepages in the earth-rock fill dam are usually monitored by pore pressure, seepage water table, and seepage discharge. However, those monitoring are difficult to describe the seepage patterns because they are installed only in certain points. This research evaluated the seepage pattern resulting from Electrical Resistivity Tomography (ERT). The resistivity was measured by installing electrodes upstream of the Dam at every 10 m and downstream at 20 m distances. The seepage pattern was analysed from the resistivity 2 Dimension distribution using the RES2DINV program. The results showed that the seepage pattern resulting from the ERT method’s resistivity data, which was compared with data of surface dam deformation, pore pressure, and seepage water table, could explain the seepage discharge data. Based on those confirming data, the resistivity data of the ERT method was appropriate to explain the seepage pattern in the earth-rock fill dam and can be further utilized for dam stability analysis.
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Niu, Yulong, Yuan Wang, Zhiyu Sun, Jinghua Li, Xin Xiang i Zhikui Wang. "Discrepancy between Forward and Reverse Seepage Characteristics in a Single Rough Fracture". Advances in Civil Engineering 2021 (19.03.2021): 1–19. http://dx.doi.org/10.1155/2021/6648522.
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Under the uniform seepage boundary condition, the forward and reverse seepage flow rates will vary widely. In response to this phenomenon, this paper studies the mechanism of the difference in seepage characteristics between the forward and reverse directions from the fracture profile’s roughness, Darcy and non-Darcy seepage, and distribution of eddy currents. First of all, wavelet transform was used to decompose and reconstruct the single rough fracture for 8 times, and then 9 fracture models with various roughness degrees were constructed. Then, Finite Volume Method was used to simulate the seepage in the original and approximate models of the Reynolds number varying from 0.001 to 1000. The results show that the nonlinear seepage is necessary for the difference between the forward and reverse seepage characteristics of the single rough fracture. The mechanism of the discrepancy between forward and reverse nonlinear seepages is the diverse shapes and distribution of the eddy current generated by the forward and reverse seepage. The secondary roughness provides space for the existence and development of the eddy current. The secondary roughness is the geometric basis of the discrepancy between the forward and reverse seepage characteristics.
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Bijoy, Sourov Datta, Md Yousuf Gazi, SM Mainul Kabir i Badrul Imam. "Geological and Geophysical Observations to Determine the Gas Seepage Source of Titas Gas Field Region, Bangladesh". Journal of the Asiatic Society of Bangladesh, Science 45, nr 1 (18.06.2019): 93–109. http://dx.doi.org/10.3329/jasbs.v45i1.46572.
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Titas Gas Field, the largest gas field in Bangladesh, has been encountering gas seepages in numerous points at the surface in an area of about 7 sq. km. at the southeastern part of the field since 2006. Gas has been seeping through the water wells, small and large holes in the fields including agricultural lands, in the river and through the cracks in the ground. The present research attempts to point out the source of the gas seepages based on the field studies, wireline log analyses and other available borehole data. A reconnaissance resistivity survey has been carried out around the high seepages area to detect any evidence of shallow subsurface fault. No fault was detected by resistivity survey in the shallow depth in the seepage area and thus fault as a conduit for the seepage could not be confirmed. Primarily, all wells of Titas Well Location (TWL-C) (Titas-06, 08, 09 and 10) were suspected as possible source wells as the surface distribution of seepages generally clusters around TWL-C. Titas-06 and Titas-08 were taken out of suspect list as the gas seepage distributions do not follow well path and cement bonding against reservoir sands including ‘A’ sand in these two wells are also good. Gas seepages follow the well trajectories of Titas-09 and 10 wells but cement bonding against ‘A’ gas sand in Titas-09 also discarded the well as a probable source of the gas seepage. Also, the suggestion that Titas well-03 could be a source of gas seep is also ruled out because of the fact that it is located 3 km away from the seepage area, there is no evidence of any seepage in between the well 3 and the seepage area, and the gas sands are also well protected. The above evidences turned the whole focus onto Titas-10. Gamma ray, resistivity, density, sonic and neutron log signatures recorded initially in the Titas-10 well strongly indicated a major gas sand and has been designated ‘A1’ gas sand. On the basis of various logs including CBL/VDL log it is evident that about 23 meters (3157-3180-meter MD) gas sand at the top which is not protected by cement. It is most likely source of gas seeps in Titas gas field is the gap in the cement protection at the top of A sand in Titas-10 well.
Asiat. Soc. Bangladesh, Sci. 45(1): 93-109, June 2019
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Panta, Manisha, Padam Jung Thapa, Md Tamjidul Hoque, Kendall N. Niles, Steve Sloan, Maik Flanagin, Ken Pathak i Mahdi Abdelguerfi. "Application of Deep Learning for Segmenting Seepages in Levee Systems". Remote Sensing 16, nr 13 (3.07.2024): 2441. http://dx.doi.org/10.3390/rs16132441.
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Seepage is a typical hydraulic factor that can initiate the breaching process in a levee system. If not identified and treated on time, seepages can be a severe problem for levees, weakening the levee structure and eventually leading to collapse. Therefore, it is essential always to be vigilant with regular monitoring procedures to identify seepages throughout these levee systems and perform adequate repairs to limit potential threats from unforeseen levee failures. This paper introduces a fully convolutional neural network to identify and segment seepage from the image in levee systems. To the best of our knowledge, this is the first work in this domain. Applying deep learning techniques for semantic segmentation tasks in real-world scenarios has its own challenges, especially the difficulty for models to effectively learn from complex backgrounds while focusing on simpler objects of interest. This challenge is particularly evident in the task of detecting seepages in levee systems, where the fault is relatively simple compared to the complex and varied background. We addressed this problem by introducing negative images and a controlled transfer learning approach for semantic segmentation for accurate seepage segmentation in levee systems.
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Fatma, Gatot Yuliyanto i Udi Harmoko. "Identify the Oil Seepage in Plantungan Geothermal Manifestation, Kendal Using HVSR Method". E3S Web of Conferences 125 (2019): 15004. http://dx.doi.org/10.1051/e3sconf/201912515004.
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The presence of oil seepage to the surface indicates that at least an active petroleum system is present subsurface. Oil seepage that occurred in Plantungan, Kendal, Central Java, has been known since 1971 and still produces seepage until today. On the research area, three oil seepages point were found. Plantungan region is located in East Serayu Zone underlain by volcanic area, and based on the Geology Map, the research area is located in Banjarnegara-Pekalongan Sheet. To understand the geology condition of the research area, a subsurface mapping is needed, even though the mapping does not provide the depth of bedrock and reservoir, data recording using HVSR (Horizontal to Vertical Spectrum Ratio) method that has been done in 18 points is able to provide Vp and density profile to understand the distribution of oil seepage. The oil seepage is most prominent close to SB09 location, however the result from crossplot found that the value of highest Vp×density is on SB12A with 4,306,197 kg/m2s, and lowest Vp×density in on SB17A with 302,305.3 kg/m2s.
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Conti, Stefano, Claudio Argentino, Chiara Fioroni, Aura Cecilia Salocchi i Daniela Fontana. "Miocene Seep-Carbonates of the Northern Apennines (Emilia to Umbria, Italy): An Overview". Geosciences 11, nr 2 (28.01.2021): 53. http://dx.doi.org/10.3390/geosciences11020053.
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The natural emission of methane-rich fluids from the seafloor, known as cold seepage, is a widespread process at modern continental margins. The studies on present-day cold seepages provide high-resolution datasets regarding the fluid plumbing system, biogeochemical processes in the sediment, seafloor seepage distribution and ecosystems. However, the long-term (hundreds of thousands to millions of years) evolution of cold seepage remains elusive. The identification and study of outcrop analogous now exposed on land represent a valuable method for better understanding the effects of geological processes and climate forcing on the development of cold seepage systems. Here, we provide an overview on Miocene seep-carbonate deposits of the northern Apennines (from Emilia to the Umbria-Marchean sector, Italy), based on decades of field research integrated with detailed sedimentological and geochemical investigations. We report a total of 13 seep-carbonate outcrops, which formed in three different structural settings of the paleo-accretionary wedge corresponding to wedge-top basins, outer slope and intrabasinal highs at the deformational front. We discuss the recurring lithostratigraphic occurrence of seep deposits and the main compositional features (carbonate facies, carbon and oxygen stable isotopes) in order to interpret the seepage dynamics, duration and infer the contribution of methane-rich fluids released by paleo-gas hydrates. The datasets presented in this study represent a valuable complete record of cold seepage spanning ~12 Myr, that can be used to better understand factors controlling the regional-scale spatial and temporal evolution of cold seepage systems at modern active continental margins.
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Yang, Jinxiu, Mingyue Lu, Zhiguang Yao, Min Wang, Shuangfang Lu, Ning Qi i Ying Xia. "A Geophysical Review of the Seabed Methane Seepage Features and Their Relationship with Gas Hydrate Systems". Geofluids 2021 (12.10.2021): 1–26. http://dx.doi.org/10.1155/2021/9953026.
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Seabed methane seepage has gained attention from all over the world in recent years as an important source of greenhouse gas emission, and gas hydrates are also regarded as a key factor affecting climate change or even global warming due to their shallow burial and poor stability. However, the relationship between seabed methane seepage and gas hydrate systems is not clear although they often coexist in continental margins. It is of significance to clarify their relationship and better understand the contribution of gas hydrate systems or the deeper hydrocarbon reservoirs for methane flux leaking to the seawater or even the atmosphere by natural seepages at the seabed. In this paper, a geophysical examination of the global seabed methane seepage events has been conducted, and nearby gas hydrate stability zone and relevant fluid migration pathways have been interpreted or modelled using seismic data, multibeam data, or underwater photos. Results show that seabed methane seepage sites are often manifested as methane flares, pockmarks, deep-water corals, authigenic carbonates, and gas hydrate pingoes at the seabed, most of which are closely related to vertical fluid migration structures like faults, gas chimneys, mud volcanoes, and unconformity surfaces or are located in the landward limit of gas hydrate stability zone (LLGHSZ) where hydrate dissociation may have released a great volume of methane. Based on a comprehensive analysis of these features, three major types of seabed methane seepage are classified according to their spatial relationship with the location of LLGHSZ, deeper than the LLGHSZ (A), around the LLGHSZ (B), and shallower than LLGHSZ (C). These three seabed methane seepage types can be further divided into five subtypes considering whether the gas source of seabed methane seepage is from the gas hydrate systems or not. We propose subtype B2 represents the most important seabed methane seepage type due to the high density of seepage sites and large volume of released methane from massive focused vigorous methane seepage sites around the LLGHSZ. Based on the classification result of this research, more measures should be taken for subtype B2 seabed methane seepage to predict or even prevent ocean warming or climate change.
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Enoh, Mfoniso Asuquo, Richard Ebere Njoku i Esomchukwu Chinagorom Igbokwe. "Geospatial Interpretation of Onshore Hydrocarbon Micro–Seepage Induced Alterations in Soils and Sediments by Spectral Enhancement Techniques". International Journal of Design & Nature and Ecodynamics 16, nr 3 (30.06.2021): 307–13. http://dx.doi.org/10.18280/ijdne.160309.
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Hydrocarbon micro – seepages are light hydrocarbon that cause oxidation – reduction reaction on the earth’s surface, resulting in alterations and anomalies such as red bed bleaching, ferrous iron enrichment and increase in the concentration of clay minerals and carbonate in overlying soils and sediments. Remote sensing has become a valuable tool in hydrocarbon micro – seepage studies and have been successfully used to interpret surface alterations and anomalies of minerals. In this study, Landsat 7 ETM+ remotely sensed data was utilized for interpreting the onshore hydrocarbon micro – seepage induced alterations zone in Ugwueme. Spectral enhancements techniques such as the principal component analysis (PCA), band ratio (BR) and false color composite (FCC) were adopted for delineating alteration zones. With Landsat 7 ETM+ band selection, and for PCA, the 1457PC3, 1345PC2 and 3457PC4 are the most suitable PC image for spectral enhancement of ferric iron, ferrous iron and clay minerals. Band ratio index such as (3/1), (7/5) and (2+5)/(3+4) also yields better enhancement for anomalous micro – seepage. The study shows that PCA, BR, FCC are good spectral enhancement techniques for interpreting hydrocarbon micro – seepage alterations in overlying soils and sediments.
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Cao, Jiansheng, Changming Liu i Wanjun Zhang. "Response of rock-fissure seepage to snowmelt in Mount Taihang slope-catchment, North China". Water Science and Technology 67, nr 1 (1.01.2013): 124–30. http://dx.doi.org/10.2166/wst.2012.542.
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The complex physiographic and hydrogeological systems of mountain terrains facilitate intense rock-fissure seepages and multi-functional ecological interactions. As mountain eco-hydrological terrains are the common water sources of river basins across the globe, it is critical to build sufficient understanding into the hydrological processes in this unique ecosystem. This study analyzes infiltration and soil/rock-fissure seepage processes from a 65 mm snowfall/melt in November 2009 in the typical granitic gneiss slope catchment in the Taihang Mountains. The snowfall, snowmelt and melt-water processes are monitored using soil-water time-domain reflectometry (TDR) probes and tipping bucket flowmeters. The results suggest that snowmelt infiltration significantly influences soil/rock water seepage in the 0–100 cm soil depth of the slope-catchment. It is not only air temperature that influences snowmelt, but also snowmelt infiltration and rock-fissure seepage. Diurnal variations in rock-fissure seepage are in close correlation with air temperature (R2 > 0.7). Temperature also varies with soil/rock water viscosity, which element in turn influences soil/rock water flow. Invariably, water dynamics in the study area is not only a critical water supply element for domestic, industrial and agricultural uses, but also for food security and social stability.
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Akinlabi I. A. i Olanrewaju S. A. "Assessment of Seepage in an Embankment Dam Using Very Low Frequency Electromagnetic and Geoelectrical Methods". Asian Journal of Environment & Ecology 23, nr 7 (2.06.2024): 114–24. http://dx.doi.org/10.9734/ajee/2024/v23i7568.
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Geoephysical surveys involving Very Low Frequency Electromagnetic (VLF-EM), Vertical Electrical Sounding (VES) and 2D resistivity imaging were conducted along the embankment of Asejire dam to detect potential seepage zones and assess the integrity of the dam. 750 VLF-EM measurements were made at 10 m station interval using the VLF-EM Equipment. 24 Schlumberger VES were conducted at 20 m interval using resistivity meter and its accessories. The current electrode spacing (AB/2) was varied from 1 m to 100 m. The 2D resistivity profiling employed the dipole-dipole configuration with electrode spacing, a = 20 m and expansion factor, n = 1 - 5. The VLF-EM data were processed and modelled using Fraser Filtering and Karous-Hjelt software to delineate subsurface zones of varying conductivities suggesting anomalous seepage. The VES data were quantitatively interpreted using the partial curve matching technique and 1D resistivity inversion algorithm while the dipole-dipole data were inverted using 2D resistivity inversion procedure. The VLF-EM inverted sections revealed prominently conductive zones indicating anomalous seepage zones beneath the dam embankment. The relatively less conductive zones possibly indicate reduced seepage. The results of VES interpretation revealed three geoelectric layers beneath the dam embankment representing the caprock, core and bedrock. The 2D inverted resistivity sections delineated zones with anomalously low resistivity generally less than 10 Ωm, indicating anomalous seepage, beneath the embankment. This study has demonstrated the effectiveness of combining the VLF and geoelectrical methods for delineating anomalous seepages in the assessment of dam safety. The anomalously low resistivity/high conductive zones identified beneath the dam embankment are suspected anomalous seepage zones which can threaten the integrity of the dam. Routine monitoring and remedial measures are therefore recommended to forestall the failure of the dam.
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Alzamily, Zaid Neamah, i Basim Sh Abed. "Comparison of Seepage Trough Zoned Earth dam Using Improved Light-Textured Soils". Journal of Engineering 28, nr 3 (1.03.2022): 32–45. http://dx.doi.org/10.31026/j.eng.2022.03.03.
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Seepage through earth dams is one of the most popular causes for earth dam collapse due to internal granule movement and seepage transfer. In earthen dams, the core plays a vital function in decreasing seepage through the dam body and lowering the phreatic line. In this research, an alternative soil to the clay soil used in the dam core has been proposed by conducting multiple experiments to test the permeability of silty and sandy soil with different additives materials. Then the selected sandy soil model was used to represent the dam experimentally, employing a permeability device to measure the amount of water that seeps through the dam's body and to represent the seepage line. A numerical model was adopted using Geo-Studio software in the branch (SEEP/W) to simulate the experimental model, examined soils with different percentages of additives, and compared the numerical and experimental results to predict the innovation model of soil. It was found that the sandy type (C) soil model has a permeability very close to that of clay soil when using 10% cement kiln dust (CKD) and 5% cement as additives. Furthermore, soil type (C) was calibrated with the core soil of HIMREEN Earth dam, which is clay soil, as well as with the core soil of HADITHA Earth dam, which is composed of dolomite. The comparison between the results of the hypothetical simulated cases and the real cases were revealed a high agreement between the two cases according to the resulted of identical phreatic (seepage) lines and the calculated amount of seepages water from these cases.
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He, Pengli, Jinjun Guo i Shixu Zhang. "Feasibility of Microbially Induced Carbonate Precipitation to Enhance the Internal Stability of Loess under Zn-Contaminated Seepage Conditions". Buildings 14, nr 5 (26.04.2024): 1230. http://dx.doi.org/10.3390/buildings14051230.
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Loess is widely distributed in Northwestern China and serves as the preferred engineering construction material for anti-fouling barriers. Heavy metal contamination in soil presents significant challenges to the engineering safety of vulnerable loess structures. Hence, there is an urgent need to investigate the impact of heavy metal ions on their percolation performance. In order to investigate the effectiveness of microbially induced carbonate precipitation (MICP) using Sporosarcina pasturii (CGMCC1.3687) bacteria in reducing internal seepage erosion, a saturated permeability test was conducted on reshaped loess under constant water head saturation conditions. The response of loess to deionized water (DW) and ZnCl2 solution seepages was analyzed by monitoring changes in cation concentration over time, measuring Zeta potential, and using scanning electron microscopy (SEM). The results indicate that the hydrolysis of Zn2+ creates an acidic environment, leading to the dissolution of carbonate minerals in the loess, which enhances its permeability. The adsorption of Zn2+ ions and the resulting diffusion double-layer (DDL) effect reduce the thickness of the diffusion layer and increase the number of free water channels. Additionally, the permeability of loess exposed to ZnCl2 solution seepage significantly increased by 554.5% compared to loess exposed to deionized water (DW) seepage. Following the seepage of ZnCl2 solutions, changes in micropore area ratio were observed, decreasing by 48.80%, while mesopore areas increased by 23.9%. MICP treatment helps reduce erosion and volume shrinkage in contaminated loess. Carbonate precipitation enhances the erosion resistance of contaminated loess by absorbing or coating fine particles and creating bridging connections with coarse particles. These research results offer new perspectives on enhancing the seepage properties of saturated loess in the presence of heavy metal erosion and the geochemical mechanisms involved.
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Barnett, Anna. "Seabed seepage". Nature Climate Change 1, nr 909 (27.08.2009): 99. http://dx.doi.org/10.1038/climate.2009.81.
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Flint, David. "Shale seepage". New Scientist 219, nr 2924 (lipiec 2013): 29. http://dx.doi.org/10.1016/s0262-4079(13)61683-8.
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Luo, Yufeng, Kaihua Bai, Seydou Traore, Hong Gu, Yong Sun, Yujiang Xiong, Xiyun Jiao i Guy Fipps. "Determining Seasonal Canal Seepage Using Stage-Seepage Relationship". Irrigation and Drainage 65, nr 3 (20.01.2016): 334–40. http://dx.doi.org/10.1002/ird.1960.
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Zhang, Yaolei, Haitong Sui, Lei Yang i Rongfeng Lin. "An Experimental Investigation on the Shear-Seepage Coupling Failure Behavior of Split Grouting-Reinforced Body". Processes 11, nr 9 (10.09.2023): 2704. http://dx.doi.org/10.3390/pr11092704.
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A split grouting-reinforced body (SGRB) is the new surrounding rock that forms after split grouting reinforcement in tunnels and underground engineering, and its shear-seepage behavior is one of the critical factors affecting tunnel stability. The effects of seepage pressure, confining pressure, and the roughness of the soil–slurry interface on the shear-seepage characteristics of SGRB specimens were investigated using a modified triaxial shear-seepage coupling test system. The failure mechanism for the SGRB was analyzed taking into account its seepage behavior and mechanical characteristics. The results showed that the seepage process of the SGRB specimens could be divided into four stages according to the seepage velocity, including the waterless, rapid, decelerating, and steady seepage stages, and the corresponding water turbidity in the seepage stages was classified as turbid, mildly turbid, or clear, respectively. The peak shear stress of the soil–slurry interface of the SGRB specimens under seepage was lower than that in the waterless environment, and the peak shear stress decreased from 57.25 kPa (waterless) to 29.37 kPa (a seepage pressure of 0.08 MPa), marking a reduction of 50.74%. The seepage phenomenon of the specimens was related to the ‘seepage-to-confining ratio’, and its critical points in the waterless, seepage, and seepage surge stages were 0.2, 0.4, and 0.6, respectively.
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Xie, Jian Bin, Jing Fan, Zhi Liang Wang, Wen Lian Liu i Jing You Hu. "Numerical Simulation on the Three-Dimensional Seepage Field of Zhelamuqing Tailings Dam". Applied Mechanics and Materials 256-259 (grudzień 2012): 19–25. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.19.
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Based on the engineering geological, hydrogeological conditions and survey results of Zhelamuqing tailings dam, two types seepage problems in the tailings dam which are saturated seepage and saturated - unsaturated seepage were described and solved by Darcy law and Richards Equation respectively. Then the three-dimensional seepage field of tailings dam under steady saturated state was simulated by finite element method (FEM). And the seepage line of saturated - unsaturated seepage field in the tailings dam was simulated and predicted by numerical analysis method when the embankment is enduring the flood. Subsequently, the simulated seepage line of saturated - unsaturated seepage field in the tailings dam was verified by the survey result. Results show that it is feasible to describe the saturated seepage and saturated - unsaturated seepage by means of Darcy law and Richards Equation respectively and it is effective to simulate the three-dimensional seepage field of tailings dam under steady saturated state by using the finite element software Midas GTS. Results also show that the simulated seepage line of saturated - unsaturated seepage field in the tailings dam agree with the survey result.
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Li, Hao, i Meng Yang. "Application Study of Distributed Optical Fiber Seepage Monitoring Technology on Embankment Engineering". Applied Sciences 14, nr 13 (21.06.2024): 5362. http://dx.doi.org/10.3390/app14135362.
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It is very important for embankment engineering to consider the seepage factor. If the potential seepage is not discovered in time and seepage control measures are not appropriate, seepage is very likely to cause damage and deformation, resulting in embankment failure. Based on temperature and seepage fields theories, a temperature–seepage coupled model is established in this paper. It is combined with a distributed temperature sensing (DTS) system to measure the temperature field of the porous media. This approach allows for the inversion of the inner seepage field, realizing the real-time monitoring of embankment health to ensure its safety and long-term operation. According to the coupling analysis on the temperature–seepage fields, for practical engineering, the influence of temperature on the seepage field is small and neglectable. Only the effect of the seepage field on the temperature field is considered. The DTS optical fiber temperature measurement system is widely used in various projects nowadays because of its high stability and efficiency advantages. The optical fiber is sensitive to temperature and can give fast and accurate temperature feedback regarding seepage location. Combined with the Heat Transfer Module in COMSOL, the multi-line heat source method can be used to invert the seepage field according to the temperature field of the porous medium inside the embankment and derive the seepage flow rate of the stable seepage field. For unstable seepage, optical fiber is good at seepage measuring and location detecting. For different practical engineering, a different heating power can be used for different seepage conditions. By monitoring the temperature change, the seepage condition can be inverted which is one of the indicators for evaluating engineering safety.
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Yang, Xu Liang, Ri Chen Ji, Wen Wen Bai i Xi Chen. "Steady Seepage Analysis of the Filled Channel Slope with Anisotropy". Advanced Materials Research 1033-1034 (październik 2014): 411–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.411.
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Middle Route of South-to-North Water Transfer Project main canal is grand supplied channel, it has the high requirements for transfer water reliability, so seepage control is particularly important for the channel slope along canal. According to conditions of seepage field and transformed relations of permeability coefficient to respectively simulate the seepage of channel slope with the homogeneous isotropic seepage field and the homogeneous anisotropic seepage field, the mathematical model and finite element model were created for the seepage of the filled channel slope with stratified and rolled, using ANSYS thermal analysis module for steady seepage analysis. Compared analysis shows that the seepage of the stratified and rolled channel slope in homogeneous anisotropic of seepage field is more intense than in homogeneous isotropic of seepage field, the analysis of the stratified channel slope by the homogeneous anisotropic seepage field matches the actual and is also more reasonable.
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Qiu, Li Ting, Zhen Zhong Shen i Xiao Hu Tao. "Optimization of Seepage Prevention of Ma Erdang Hydropower Station". Advanced Materials Research 1065-1069 (grudzień 2014): 619–24. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.619.
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Base on the design of seepage control, the three-dimensional non-steady saturated - unsaturated seepage finite element analysis program CNPM3D is used to establish the three-dimentional finite element seepage model of junction area during operating period. The seepage field of dam site area is studied under the different anti-seepage curtain arrangement scheme. Specifically, the seepage gradient and the seepage discharge of the panel, major material zone, foundation curtains and two sides abutment curtains are analyzed to evaluate the stability of the major district of dam area, in order to provide suggestions for choosing the seepage control standard in the next deepen design stage.The calculation results show that the panel and the impervious curtain anti-seepage effect is remarkable.Impervious curtain can greatly reduce the total seepage flow of the dam and its foundation.However the curtain deepened to 1Lu has little effect on seepage discharge. It is showed that the seepage prevention standards of 3 lu should be proposed in the deepen design stage for both security and economic benefit. The achievement and experience of this seepage prevention design should be taken into consideration for other similar projects.
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Yin, Li Ming, Jun Tao Chen i Wen Bin Sun. "Experimental Study on Three Dimensional Coupled Stress-Seepage Law of Single Fracture". Applied Mechanics and Materials 353-356 (sierpień 2013): 524–28. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.524.
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Equation of three dimensional stress, seepage pressure and permeability coefficient was obtained by theoretical analysis. Applying the true triaxial rock testing system of coupled stress-seepage, seepage test of granite sample with prefabricated single fracture was made under three dimensional coupled stress-seepage. The results show that three dimensional stress have the inhibition effect on single fracture seepage, and the normal main stress, having the leading role, obviously influences the permeability coefficient; seepage pressure has the promote effect on single fracture seepage, resisting the normal main stress. Fitting formula of granite permeability coefficient was gained under coupled stress-seepage which indicated the exponential relationship between permeability coefficient and three dimensional stress and seepage pressure.
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Jiang, Zhenxiang, i Jinping He. "Detection Model for Seepage Behavior of Earth Dams Based on Data Mining". Mathematical Problems in Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/8191802.
Pełny tekst źródłaStreszczenie:
Seepage behavior detecting is an important tool for ensuring the safety of earth dams. However, traditional seepage behavior detection methods have used insufficient monitoring data and have mainly focused on single-point measures and local seepage behavior. The seepage behavior of dams is not quantitatively detected based on the monitoring data with multiple measuring points. Therefore, this study uses data mining techniques to analyze the monitoring data and overcome the above-mentioned shortcomings. The massive seepage monitoring data with multiple points are used as the research object. The key information on seepage behavior is extracted using principal component analysis. The correlation between seepage behavior and upstream water level is described as mutual information. A detection model for overall seepage behavior is established. Result shows that the model can completely extract the seepage monitoring data with multiple points and quantitatively detect the overall seepage behavior of earth dams. The proposed method can provide a new and reasonable means of quantitatively detecting the overall seepage behavior of earth dams.
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Liu, Ruhao, Yu Sun, Xinrui Wang, Baiquan Yan i Haitao Yu. "Characteristics of Seepage Barriers in Fluvial Reservoirs of Meandering Rivers and Their Impacts on Water Injection Development: A Case Study of Neogene Guantao Formation in Block M, Gudao Oilfield". Geofluids 2022 (15.04.2022): 1–14. http://dx.doi.org/10.1155/2022/8782179.
Pełny tekst źródłaStreszczenie:
To deepen our understanding of reservoir heterogeneity, seepage barriers in the study area were divided into interlayer, intralayer, and planar levels based on their spatial distribution characteristics and then investigated by taking the third member of the Neogene Guantao Formation in the block M of the Gudao oilfield as an example. Based on their genesis characteristics, the interlayer seepage barriers were divided into the overbank sand-overbank sand type, overbank sand-channel type, isolated channel superposition type, and channel shallow-cut type. The planar seepage barriers were categorized into the channel boundary type, abandoned channel type, channel-overbank sand type, and floodplain mudstone type. The intralayer seepage barriers were classified into the mudstone type and physical property type. Classifying multiple levels of different types of seepage barriers led to the refinement of their spatial characteristics. The strength of seepage barriers was characterized using the “seepage barrier coefficient” and “reservoir quality coefficient,” and the small-valued coefficients of the interlayer and intralayer seepage barriers indicated that these seepage barriers are characterized by large thickness, high mudstone content, poor physical properties, and weak seepage ability. The strength of the planar seepage barriers was dependent on the sedimentary facies types and channel stages, and the difference between planar seepage barriers was characterized using the reservoir quality coefficient. The seepage barriers were described based on the multilevel classification of seepage barrier categories, the intralayer seepage barriers with a lateral accretion pattern in the meandering river point bars were identified and described, and the distribution characteristics of seepage barriers were summarized at multiple levels. The method of “hierarchical analysis, skeleton construction, and category fitting” was used to establish 3D models of different levels of seepage barriers, and a modeling method based on the characteristics of intralayer seepage barriers under the constraint of architecture pattern was used to model intralayer seepage barriers with a lateral accretion pattern. In the monitoring of water injection profiles, it was found that the extent of blockage achieved by seepage barriers affects the water injection volume and thus controls the fluid transport pattern. Due to the development characteristics of the seepage barrier in the formation, there are some differences in injection production efficiency under different well pattern matching modes. The research on the distribution characteristics of different levels of seepage barrier categories provides a reliable geological basis for improving the injection-production relationship.
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Yan, Guo Xin, i Wei Wu. "Analysis on Seepage Effects of Plastic Concrete Cut-Off Wall in Construction and Operation Period of Hydropower Station Tail Channel". Applied Mechanics and Materials 580-583 (lipiec 2014): 1816–22. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.1816.
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By numerical calculation, it analyzed the seepage effects of plastic concrete cut-off wall in in construction period. On construction period, the seepage flow from inside of channel to outside at unit length is 0.753m3/h. The seepage flow from under plastic concrete cut-off wall is 0.646m3/h which is 85.79% of total seepage flow. Under certain condition on operation period, the seepage flow from inside of channel to outside at unit length is 0.394m3/h. The seepage flow from under plastic concrete cut-off wall is 0.358m3/h which is 90.86% of total seepage flow. Under another condition on operation period, the seepage flow from inside of channel to outside at unit length is 0.249m3/h. The seepage flow from under plastic concrete cut-off wall is 0.236m3/h which is 94.78% of total seepage flow. In It showed the plastic concrete cut-off wall has obvious effect.
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Shi, Xuyang, Wei Zhou, Qingxiang Cai i Xiang Lu. "Experimental Study on Nonlinear Seepage Characteristics and Particle Size Gradation Effect of Fractured Sandstones". Advances in Civil Engineering 2018 (15.10.2018): 1–11. http://dx.doi.org/10.1155/2018/8640535.
Pełny tekst źródłaStreszczenie:
Seepage mutation of fractured rock mass is one of the main inducements of dump slide and other disasters. Pore structure is a significant factor affecting the seepage characteristics of fractured rock mass, while particle size gradation has an important effect on the distribution of pore structure. Through the self-developed experimental system, the nonlinear seepage test on the fractured sandstones of the coalseam roof was conducted to investigate the influence of seepage pressure, porosity, and fractal dimension. Besides, the nonlinear seepage model was established by Barree–Conway theory. The results showed that, during the seepage process of fractured sandstone, there were significant nonlinear characteristics, which increased with the increase of the seepage pressure. With the increasing porosity, there was greater average pore size of fractured sandstone, stronger permeability, and weaker nonlinear seepage. The seepage characteristics approximated to that of Darcy model. However, with increasing grading fractal dimension, there were smaller average pore size of fractured sandstone, weaker permeability, and stronger nonlinear seepage. The seepage characteristics approximated to that of Forchheimer model.
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Song, Zhi Fei, i Qin Huan Cui. "Research Status on Muddy Water Seepage Theory". Advanced Materials Research 790 (wrzesień 2013): 142–45. http://dx.doi.org/10.4028/www.scientific.net/amr.790.142.
Pełny tekst źródłaStreszczenie:
Muddy water seepage theory is an important content which can not be ignored in seepage calculation. The study on muddy water seepage theory starts late. Now most of the theory used for seepage calculation is clear water theory. The process of the percolation of muddy water and clear water has the same physical mechanism. There are still special effects on the process of the percolation in relation to sediment material in muddy water.The scope of application of muddy water seepage theory is wide. Muddy irrigation, water-soil conservation, tailings dam seepage analysis and many other fields require muddy water seepage theory. The theory has important theoretical and application value in production practice. Based on the research status on muddy water seepage theory, this paper discusses the seepage experiment,the flow mechanism and engineering application in many aspects, analyses and summarizes previous research achievements. Finally, a brief conclusion of the key problems and the development trend of muddy water seepage theory are elaborated.
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Xu, Yun Feng, Zhen Zhong Shen i Chao Xin Shao. "Seepage Stability Analysis for Surrounding Rock Mass of Diversion Tunnel by FEM". Advanced Materials Research 787 (wrzesień 2013): 622–25. http://dx.doi.org/10.4028/www.scientific.net/amr.787.622.
Pełny tekst źródłaStreszczenie:
Based on the actual conditions of the project and related experience, the seepage model of diversion tunnel and its surrounding rock mass was built to analyze its seepage stability. The seepage field was calculated by using finite element method (FEM) and cut-off negative pressure method. Two typical cross-sections and working conditions were chosen to evaluate the seepage stability of the surrounding rock mass. According to the results, the seepage gradient is larger when one tunnel is filled with water while the other is empty. The maximum seepage gradient is less than the allowable seepage gradient, so the surrounding rock mass of the diversion tunnel can meet the demand of seepage stability.
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Xuefeng, Fan, Zhenyu Wu, Liu Lijun, Yanfeng Wen, Shu Yu, Zhao Zepeng i Zefa Li. "Analysis of Sluice Foundation Seepage Using Monitoring Data and Numerical Simulation". Advances in Civil Engineering 2019 (19.09.2019): 1–15. http://dx.doi.org/10.1155/2019/2850916.
Pełny tekst źródłaStreszczenie:
For sluices built on soil foundations, seepage safety of the foundation is one of the most concerns during operation of sluices. Monitoring data could reflect the real seepage behavior in the foundation, but of which the shortcoming is that generally only the local seepage states can be measured. The seepage field in the whole foundation can be analyzed by numerical simulation. The permeability coefficients of the foundation materials significantly affect the numerical simulation results; however, it is difficult to accurately determine the values of permeability coefficients. In this paper, an approach based on response surface method (RSM) for calibration of permeability coefficients was proposed, and the efficiency of parameter calibration is improved by constructing the response surface equation instead of time-consuming finite element calculation of foundation seepage. The seepage in a sluice foundation was analyzed using monitoring data and numerical simulation. The monitoring data showed that the seepage pressure in the foundation periodically varies with high value in flood season and low value in dry season. After calibration of the permeability coefficients of the foundation materials using the measured seepage pressure, the seepage fields in the foundation for different water levels were numerically simulated to investigate the cause for the periodical variation of the seepage pressure and the seepage safety of the foundation was assessed with the calculated seepage gradients. The methods adopted in this study could be applied to seepage analysis for sluice foundations with similar geologic conditions and antiseepage measures.
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Cai, Wenya, Yan Wang, Fujun He, Pengyuan Zhang i Shuo Sun. "The Seepage-Destruction Mechanism of Water Inrush Channel of Sandstone Fault Filling Using the EDEM-Fluent Method". Advances in Civil Engineering 2022 (5.10.2022): 1–11. http://dx.doi.org/10.1155/2022/3313013.
Pełny tekst źródłaStreszczenie:
By the EDEM-Fluent coupling calculation method, the formation mechanism of the seepage failure water inrush channel and the migration of particles in the sandstone fault filling body are studied. Under the condition of variable hydraulic gradient, the whole seepage process can be divided into three stages: slow seepage stage, sudden seepage stage, and stable seepage stage. In the stage of slow seepage, the mass of lost particles is small. In the stage of sudden seepage, particles are lost on a large scale. In the stable seepage stage, the model is basically in a stable state. During the seepage process, the particles in the outlet zone will move before the particles in the inlet zone under the action of the seepage force. The overall movement trend of particles can be predicted, while the movement trajectory of a single particle is irregular. The change trend of the contact quantity between particles is basically consistent with the change in the quality of the lost particles. Moreover, the change in the contact quantity of particles is caused by the loss of the filler particles.
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Hou, Jifeng, Zhongping Guo, Weizhen Liu, Hengze Yang i WenWu Xie. "Study on Damage Model and Damage Evolution Characteristics of Backfill with Prefabricated Fracture under Seepage-Stress Coupling". Advances in Materials Science and Engineering 2020 (9.03.2020): 1–11. http://dx.doi.org/10.1155/2020/3642356.
Pełny tekst źródłaStreszczenie:
Aiming at the backfill with prefabricated fracture under seepage-stress coupling, the concepts of fracture macrodamage, loaded mesodamage, seepage mesodamage, and total damage of backfill were proposed. Based on the macroscopic statistical damage model, the coupling effect of seepage, stress, and initial fracture was considered comprehensively and the damage model of backfill with prefabricated fracture under seepage-stress coupling was established. The mechanical properties of backfill with prefabricated fracture under different seepage water pressures and confining pressures were tested and the rationality of the model was verified. The research shows that the mechanical properties of backfill with prefabricated fracture under the seepage-stress coupling are determined by the seepage water pressure, the load, the initial fracture, and the coupling effect. Fracture and seepage have significant effects on the damage of the backfill. When the seepage water pressure is low, the fracture damage dominates; however, when the seepage water pressure is high, the seepage damage dominates; the total damage under the coupling action is more serious than the single factor. The development laws of the total damage evolution curves under different seepage water pressures and confining pressures are basically the same, and they show the S-shaped distribution law with the increase of the axial strain. With the increase of confining pressure, the damage effect of fracture and seepage on the backfill is weakened, indicating that the confining pressure has a certain inhibitory effect on the damage evolution of the backfill. The research results can provide a theoretical basis for the study of the stability of backfill with geological defects such as joints and fractures in deep high-stress and high-seepage water pressure coal mines.
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Wang, Fei Han, Guo Xin Yan i De Jun Zhao. "Analysis on Mechanism of Coupling Fields of Seepage and Stress and its Modeling". Advanced Materials Research 919-921 (kwiecień 2014): 1211–15. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1211.
Pełny tekst źródłaStreszczenie:
In rock and soil media, seepage and stress fields are interacting and interrelated system. Analyzing on mechanism of seepage field acting on stress field and on mechanism of stress field acting on seepage field in rock and soil media, it established mathematical model of seepage field with stress field acting on and mathematical model of stress field with seepage field acting on. According to coupling mechanism, it gave mathematical model of coupling seepage field and stress field and corresponding steps of FEM
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Liu, Ze Han, Zhen Zhong Shen, Wen Wu Qing, Su Fan Xiong i Lei Gan. "Anti-Seepage Evaluation of Reinforcement Effect for Fengchan Earth Dam". Key Engineering Materials 753 (sierpień 2017): 290–94. http://dx.doi.org/10.4028/www.scientific.net/kem.753.290.
Pełny tekst źródłaStreszczenie:
Currently, there is a large amount of earth dams should be reinforced because of the running incessantly in a long period in our country. And the anti-seepage evaluation is an extremely critical and indispensable index to scrutinize the reinforcement effect of earth dam comprehensively. According to the real engineering conditions of the dam, the finite element seepage analysis method is used to compute the seepage characteristics in the Fengchan reservoir before and after the reinforcement in this paper. The results show that the effect of the anti-seepage system is well for adopting the concrete slope protection and concrete anti-seepage wall. The seepage state of foundation and dam body is improved evidently. The seepage gradient and seepage quantity of each material zone reduce significantly and meet the standard requirement of specification.
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Yan, Jun, Si Hong Liu i Bin Zhou. "Numerical analysis of the anti-seepage measures for high earth rockfill dam on deep overburden". Applied Mechanics and Materials 170-173 (maj 2012): 1872–77. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.1872.
Pełny tekst źródłaStreszczenie:
The anti-seepage measures of a high earth rockfill dam built on the foundation with a deep overburden affects the stability and safety of the dam greatly. Nowadays there are few researches on this area both at home and abroad. On the basis of the finite element seepage analysis of the Pubugou high rockfill dam in which core walls and two cut-off walls are designed as the anti-seepage measures, the real seepage behavior of the seepage field is obtained in this paper, as well as the seepage characters of the seepage field under different arrangements of the cut-off walls. The conclusions have a certain referential value for the design of the anti-seepage measures for the similar projects with the foundation of a deep overburden.
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Patel, Mahesh, Shantanaba Majumder i Bimlesh Kumar. "Statistical description of morphological characteristics of bedforms in seepage affected alluvial channels". Canadian Journal of Civil Engineering 45, nr 2 (luty 2018): 87–98. http://dx.doi.org/10.1139/cjce-2017-0356.
Pełny tekst źródłaStreszczenie:
In this study, experiments were performed in a curvilinear cross-sectional threshold alluvial channel with no seepage and with seepage conditions to understand the influence of downward seepage in an alluvial channel. We observed that a stable channel during the no seepage condition started to approach a stable channel in the transporting stage with downward seepage. Increased value of Shields stress was observed after the application of seepage. In addition, this study deals with the effect of downward seepage on the evolution of alluvial bedforms. In this regard, multi-temporal bed elevation profiles were collected along the test section of channel, which are used to characterize migrating bedforms. Results reveal greater fluctuations and variability on the channel bed under the influence of increased seepage discharge. Slope of the power spectral density with wave number was significantly increased with an increment in seepage percentage, showing more inhomogeneous arrangement of bedforms and larger roughness over the channel boundary.
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Chen, Shou-Kai, i Xiaoyue Zhang. "Seepage Control in a High Concrete Face-Rock Fill Dam Based on the Node Virtual Flow Method". Open Construction and Building Technology Journal 10, nr 1 (14.12.2016): 547–60. http://dx.doi.org/10.2174/1874836801610010547.
Pełny tekst źródłaStreszczenie:
The seepage control system of a high Concrete Face Rock-Fill Dam (CFRD) may have anti-seepage deficiencies during both construction and operation. In order to solve these, the three-dimensional Finite Element Method (FEM) model was built based on dam body filling, anti-seepage system, defect location and bedrock distribution. The seepage field simulation and computation were carried out using an improved node virtual flux method and the zero-thickness crack model theory. The water head distribution, seepage lines and dam leakage field were obtained by simulation under different conditions, and the seepage characteristics during construction and operation were analyzed systematically. Taking a high CFRD as an example, the results showed that during the flood-control construction period, the incomplete nature of the dam face slab can lead to seepage damage near the second seepage control line. Moreover, during operation period; the seepage control system was still effective when the dam face slab was incomplete.
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Ardiansyah, Rahman Hakim, i Ignatius Sriyana. "EVALUASI DEBIT REMBESAN DARI DATA BACAAN V-NOTCH PADA BENDUNGAN BENEL". Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil 26, nr 2 (1.12.2021): 209. http://dx.doi.org/10.32497/wahanats.v26i2.3134.
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The Benel Dam, one of the dams in Bali, is an already operational dam, so it necessary to monitor the behavior of the dam body to be able to find out as early as possible if an anomaly occurs, one of which is monitoring seepage discharge at the v-notch. The purpose of this study is to determine the fluctuation of seepage discharge and its correlation to the reservoir level, and to determine the safety of the seepage discharge that occurs. The evaluation of seepage discharge is carried out on reading data that is not influenced by rainfall, then compares it with the limits of the seepage acceptance criteria and seepage index. From the analysis results show the correlation between seepage discharge and reservoir level r = 0.2296 and after parsing the data, it is obtained for 2013, 2014, 2018 and 2019 data that the correlation level is moderate - very strong. The results of the parsing then selected data that is not affected by rainfall. The seepage discharge that occurs is still smaller than 0.14 liters/minute/meter, while the seepage index (QI) is greater than 1. In the seepage index analysis, it is necessary to use the seepage path length parameter that is appropriate or close to the actual condition.
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Wu, Yue, Yan-Zhi Li, Wei-Guo Qiao, Zhen-Wang Fan, Shuai Zhang, Kui Chen i Lei Zhang. "Water Seepage in Rocks at Micro-Scale". Water 14, nr 18 (11.09.2022): 2827. http://dx.doi.org/10.3390/w14182827.
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To complete groundwater diversion, the complex flow law of groundwater in rocks must be investigated so that groundwater diversion can be improved. This research uses the computer finite element method (FEM), CT scanning calculation method, Avizo method, and digital core technology combined with the Fluent calculation method (FCM) to reconstruct rocks with microscopic pore structures on a computer. The numerical simulation results under different conditions show that: the total pressure change gradually decreases under different pressure gradients. In a seepage channel, the seepage path does not change with the change in seepage pressure, and the seepage velocity is the largest in the center of the pore. The longer the seepage path is, the greater the decrease in seepage velocity. Different seepage directions have similar seepage laws. The research results provide effective guidance for the project to control groundwater.
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Sharma, Anurag, i Bimlesh Kumar. "Double averaged turbulence characteristics of alluvial channel with downward seepage". Canadian Journal of Civil Engineering 45, nr 2 (luty 2018): 135–51. http://dx.doi.org/10.1139/cjce-2016-0581.
Pełny tekst źródłaStreszczenie:
Present work evaluates the double averaged turbulence characteristics of the sand bed channel subjected to the downward seepage through permeable bed. Measures of turbulent statistics are observed to increase with the application of downward seepage. The form induced stress in near bed has a reducing effect with no seepage and an increasing effect with seepage. The seepage increases the turbulent kinetic energy and turbulent intensities causing the bed particles to move rapidly. The quadrant analysis suggests that at near bed, the sweep events in flows with seepage are the main bursting events towards the Reynolds stress production, while ejection and sweep events in no seepage flow have almost equal contribution. The increase in sediment transport with seepage is caused by an increase in flow turbulence production and an associated decrease in turbulent kinetic energy dissipation and turbulent diffusion.
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Chavan, Rutuja, i Bimlesh Kumar. "Downward seepage effects on dynamics of scour depth and migrating dune-like bedforms at tandem piers". Canadian Journal of Civil Engineering 47, nr 1 (styczeń 2020): 13–24. http://dx.doi.org/10.1139/cjce-2017-0640.
Pełny tekst źródłaStreszczenie:
The present study focuses on multi-scale statistical characterization of scour depth at tandem piers and migrating dune-like bedforms forming behind the piers in downward seepage affected alluvial channel, using an experimental approach. Experiments were conducted using two circular piers arranged in a tandem manner for no seepage, 10% seepage, and 15% seepage condition. The erosive capacity of reversal flow is hindered with downward seepage, which results in reducing velocity and Reynolds stress near the bed at upstream of piers in case of seepage runs. The bed elevation of the scoured region is decreasing with the increasing seepage percentage and the growth in scour depth is diminishing with time. The celerity of scour depth is decreasing with time as well as decreasing with increasing downward seepage. Probability density function of bedform elevation has positive tail slightly thicker than the Gaussian.
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Zhen, Zhixin, Xuewei Ma i Bo Ma. "Exploration and Research on the Propagation Law of Seepage Risk Network in Tailings Storage Facility". Discrete Dynamics in Nature and Society 2021 (8.11.2021): 1–14. http://dx.doi.org/10.1155/2021/8704259.
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The seepage accident of a tailings pond poses a serious threat to the stability of tailings dams and the surrounding environment. To reduce the occurrence of seepage accidents, this paper studies the identification of seepage hazards, the propagation law of seepage risk, the importance of hazards, and the priority of hazard treatment. To overcome the subjectivity and omission of hazard identification, according to the complexity and dynamics of tailings seepage, this paper proposes the evidence-based identification method of three-dimensional seepage hazards (EIMTSH) to identify the hazards of the tailings seepage system and the relationship between hazards. Then, on the basis of identifying the hazards of the tailings seepage system, the propagation network of seepage risk in tailing ponds (PNSRTP) is constructed based on the complex network theory. By analyzing the characteristics of the PNSRTP, it can be found that the propagation of seepage risk is scale-free and small-world. Through the node deletion method, this paper finds that the nodes with a higher degree value can reduce the network efficiency more quickly and should be governed first. By giving priority to the treatment of hazards with higher degree, the propagation of seepage risk can be reduced more quickly and the risk management level of tailings ponds can be improved, which is helpful to realize the sustainable development of mining production.
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Zhou, Desheng, Haiyang Wang, Yafei Liu, Shun Liu, Xianlin Ma, Wenbin Cai i Hai Huang. "Effect of Seepage Force on the Wellbore Breakdown of a Vertical Wellbore". Geofluids 2021 (7.04.2021): 1–12. http://dx.doi.org/10.1155/2021/8871535.
Pełny tekst źródłaStreszczenie:
As a fluid flows through a porous media, a drag force, called seepage force in the paper, will be formed on the matrix of the media in the fluid flowing direction. However, the seepage force is normally ignored in the analysis of wellbore fracturing during hydraulic fracturing operation. In this paper, an analytical model for seepage force around a vertical wellbore is presented based on linear elasticity theory, and the effect of the seepage force on wellbore breakdown has been analyzed. Also studied are the effects of the two horizontal principal stresses and the reservoir permeability on the action of seepage force. The paper proves that seepage force lowers formation breakdown pressure of a vertical wellbores; the deeper a formation is, the greater action of the seepage force; seepage force contributes more to breakdown formation with small difference of the two horizontal stresses such as unconventional reservoirs; seepage force increases as rock permeability decreases, and it should not be ignored in hydraulic fracturing analysis, especially for low-permeability formation.
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Shi, Shaoshuai, Xiangxiang Zhu, Zhiguo Cao, Lin Bu, Zhijie Wen, Zongqing Zhou, Weidong Guo i Ruijie Zhao. "Experimental Study of Seepage Characteristics of Filling Structures in Deep Roadway". Geofluids 2022 (14.03.2022): 1–13. http://dx.doi.org/10.1155/2022/9517011.
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In order to study the seepage failure mechanism of roadway filling medium consisting of cohesive soil under complex hydrogeological conditions, a large-scale triaxial stress-seepage test system was utilized to investigate the influence of kaolin content and seepage loading rate on the seepage characteristics of filling medium. Through the analysis on the variation rules of sand loss and particle size distribution, the seepage characteristics and whole process of seepage instability of filling medium were explored in depth. It is concluded that (1) The seepage instability process of filling medium can be categorized into three stages: the initiation loss of fine clay, the accelerating loss of soil, and the stable status of soil loss. (2) The seepage failure process rate is proportional to the seepage loading rate and inversely proportional to the content of kaolin. (3) The kaolin and sand content of remaining mixture presented initial>bottom>middle>top status. The research results have guidance value for exploring the instability evolution mechanism of filling medium in deep roadway.
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Yan, Zhong Qi, Zhen Zhong Shen i Li Qun Xu. "Study on Optimization of Anti-Seepage and Drainage System for High Concrete Sand-Gravel Dam". Applied Mechanics and Materials 733 (luty 2015): 451–55. http://dx.doi.org/10.4028/www.scientific.net/amm.733.451.
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The design height of a concrete sand-gravel dam is up to 251 meters, which has strong unloading rock masses with great depth on the left bank. According to the topographic and hydro geologic conditions of the dam site, a three-dimensional finite element model for seepage calculation of the dam is established. Based on the equivalent continuum method, the effect of anti-seepage and drainage system within run-time with normal storage level is studied, meanwhile, the seepage elements are obtained, including the seepage of the groundwater, the discharge of the dam, the seepage gradient of the dam body and the impervious curtain and so on, thus the conclusion that the anti-seepage and drainage system is reasonable is verified. What’s more, the influence of the different length and depth of the anti-seepage curtain to the distribution of groundwater seepage as well as the effect of "L" type drainage in the dam body are analyzed in order that the suggestion of the optimization of anti-seepage and drainage system is put forward for the high concrete sand-gravel dam.
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Yuan, Li, i Jia Lei. "The Analysis of the Seepage Characteristics of Tailing Dams Based on FLAC3D Numerical Simulation". Open Civil Engineering Journal 9, nr 1 (26.06.2015): 400–407. http://dx.doi.org/10.2174/1874149501509010400.
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In this paper, the Guangxi’s red mud disposal field is taken as the study area. Appropriate calculating parameters and boundary conditions were selected based on the survey data to build a Mohr-Coul0mb and fluid model under the plane-strain condition. FLAC software was adopted to simulate the distribution of pore water pressure, filtrate seepage paths, and leakage of the dam body under conditions with no anti-seepage design, with partial anti-seepage design and with full anti-seepage design respectively, which provided a technical base for the anti-seepage design of this tailing reservoir. The results showed that this software could better simulate the leakage of red mud tailing dams. The reservoir area displayed obvious leakage characteristics, so full anti-seepage measures and appropriate seepage-proofing materials should be employed to deal with the dam body and the reservoir area to prevent environmental pollution and guarantee the stability of the tailing dams. The method not also can provide the technical reference for the evaluation of anti-seepage works, but also gives important guidance for the anti-seepage works.
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Qi, Jian Feng, Xue Lin Song i An Long Li. "The Soil Plug Failure Analysis during the Suction Penetration of Bucket Foundation". Advanced Materials Research 243-249 (maj 2011): 3092–97. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.3092.
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A physical model test is conducted to study the hydraulic gradient and soil plug development during the suction penetration of bucket foundation in the silts. Furthermore, a FEM simulation is carried out by changing the geotechnical parameters and constitutive model to deeply study the suction penetration mechanism. Through the comprehensive analysis, the results indicate that the seepages inside and outside the bucket foundation are the direct reasons for the formation of soil plugs, and that there are the high hydraulic gradient and the safety mechanism preventing soil flow failure for the silts in the bucket foundation. The seepage changes not only the permeability of soil body but also the physical and mechanical properties, and enhances the rheological property and time effect. Thus, the soil plug failure is not seepage failure, not unloading expansion yet, is a complex deformation failure mode under the protection of safety mechanism of bucket foundation.
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Song, Zhan Ping, An Nan Jiang i Jiao Zhang. "Studying the Rock Seepage Parameters Identification Method Based on Finite Element Method and Difference Evolution Arithmetic". Key Engineering Materials 474-476 (kwiecień 2011): 933–37. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.933.
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The seepage of rock and soil is a common problem in geotechnical engineering, because of the uncertainty property of rock and soil, how to ascertain the seepage parameter of rock and soil becomes a problem to solve. Aiming to the problem, after introducing the theory of seepage parameter identification, the paper combines unstable seepage finite element method (FEM) and difference evolution (DE) arithmetic, constructs intelligent identification FEM method of seepage parameter, and develops the procedure. The hydraulic head distribution of seepage field can be calculated accurately by FEM and the optimal solution can be obtained by DE, the seepage FEM being embedded in DE, overcoming the local optimization problems of conventional methods and improving the precision of identification. A tam sample is calculated by the method, it states that the convergence speed is quick and result is satisfied. It is a powerful method for seepage parameter identification.
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Li, Yongye, Xiaoteng Song, Yaqi Pang, Xiaoni Yang, Xuelan Zhang, Liyue Yao i Xihuan Sun. "Laboratory investigation of permeability property of natural gravels with different particle sizes under different laying conditions". Science Progress 104, nr 1 (styczeń 2021): 003685042110023. http://dx.doi.org/10.1177/00368504211002357.
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The seepage properties of natural gravel are one of the problems to be considered in seepage project designs. In this paper, the seepage properties of the natural gravel with particle sizes of 5, 20 and 60 mm were investigated under different laying conditions. The effect of the particle size, laying depth, bulk density and pressurized head on the seepage properties of the natural gravel was analyzed by using the combined methods of theoretical analysis with physical model test. The results showed that the seepage flow in the natural gravel was non-laminar flow in the test conditions described in this paper. Meanwhile, the relationship between particle size, laying depth, bulk density, pressurized heads and seepage property was established. The seepage discharge increased with the increase of the pressurized head and particle size, and decreased with the increasing of laying depth and bulk density. The critical laying depth and bulk density can be obtained when the seepage discharge becomes zero. The empirical formula of the seepage discharge of natural gravel with different particle sizes, laying depths, bulk densities and pressurized heads was obtained with the method of nonlinear regression, which can be expressed as: [Formula: see text]. The empirical formula was experimentally validated. The maximum relative error did not exceed 6.73%, proving that the empirical formula of the seepage discharge of natural gravel was rational. The results can provide an important reference to further studying the seepage properties of macropore media, and form a theoretical basis for applying the natural gravel in the seepage projects.
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Zhang, Duo, Sing Kiong Nguang, Lan Shu i Dong Qiu. "Trilinear fuzzy seepage model of shale gas reservoirs with multiple fuzzy parameters". Journal of Intelligent & Fuzzy Systems 40, nr 6 (21.06.2021): 11777–97. http://dx.doi.org/10.3233/jifs-202898.
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This paper focuses on establishing the trilinear fuzzy seepage model with multiple fuzzy parameters for shale gas reservoirs. Different from the conventional seepage models of shale gas reservoirs, the multiple fuzzy parameters seepage model uses fuzzy numbers to describe some parameters with uncertainty. Firstly, the multiple fuzzy parameters seepage model is constructed based on fuzzy concepts. The fuzzy structure element method and the centroid method are used to solve the fuzzy seepage model and defuzzifier, respectively. Secondly, the advantages of the development fuzzy model over the conventional seepage model are discussed and illustrated through numerical examples and simulations. Finally, to further study the seepage laws inside shale gas reservoirs, this paper explores the sensitivity of relevant main control parameters to gas production based on the development model.
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Yang, Ning, Xuyong Wang i Jixun Ren. "Numerical simulation of temperature field of a new type of freezing device under seepage effect". PLOS ONE 19, nr 5 (16.05.2024): e0298003. http://dx.doi.org/10.1371/journal.pone.0298003.
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In order to investigate the development of the temperature field of a new type of freezing reinforcement under seepage conditions, in this paper, COMSOL finite element software was used to simplify the model and simulate the effect of groundwater seepage on the development of the temperature field of frozen pipes by coupling the Darcy’s law module and the heat transfer module for porous media. The heads of water were also varied to simulate the change in seepage velocity to further investigate the effect of seepage velocity on the temperature field. The results of the study show that the freezing wall formed in the high head region was thinner than that in the low head region due to the effect of seepage, and this phenomenon was aggravated with the increase of seepage rate; The effect of seepage action on the temperature field had a hysteresis along the seepage direction; When the seepage rate was greater than 1.65 m/d, the soil in the center of the device feezed better and could form a tight and dense freezing wall comparable to the size of the freezing device; When the seepage rate was greater than 5.78 m/d, the temperature of the center soil body gradually increased, and eventually the freezing curtain cannot be formed.
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Wang, Yu, Xiangbao Duan, Yanchang Gu i Shijun Wang. "Experimental Investigation of the Seepage-Induced Failure Process in Granular Soils". Geofluids 2022 (22.08.2022): 1–17. http://dx.doi.org/10.1155/2022/5703151.
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Seepage-induced failure may disable the bearing capacity of foundations in dams and embankments. However, the evolution mechanism of the seepage failure process in granular soils is not well understood. In this paper, a series of laboratory hydraulic tests were performed to investigate the seepage failure process in sandy gravels and fine-grained sands. Seepage behaviors of the hydraulic gradient, seepage flow velocity, and permeability coefficient were observed, and then, the Reynolds number was obtained to describe the seepage regime. By linking the hydraulic gradients with the Reynolds number, the seepage failure process was quantitatively divided into four phases: (i) incubation ( Re < 0.85 ), (ii) formation ( 0.85 ≤ Re ≤ 5 ), (iii) evolution ( 5 < Re ≤ 50 ), and (iv) destruction ( 50 < Re ). The findings of the study identified an approximately linear relationship between the hydraulic gradient and the seepage velocity in the phases of incubation and formation in which the viscous drag effects are not negligible, corroborating Darcy’s view. However, in the phases of evolution and destruction, the hydraulic gradient and the seepage velocity are nonlinearly related, indicating that the inertial force plays a leading role, and the quadratic equation is relevant for the regime transition from laminar flow to turbulent flow. Finally, the mechanism of each phase in the seepage failure process was clarified. Fine content and uniformity coefficient are internal factors that affect the potential of seepage failure, while the seepage force that drives the transport of fine particles is an underlying cause that promotes the development of seepage failure. This study will be quite useful in identifying the limits of applicability of the well-known “Darcy’s law,” in further improving the physical modelling associated with fluid flow through granular soils.