Готові списки джерел за темами / Regional slope stability analysis

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Добірка наукової літератури з теми "Regional slope stability analysis"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Regional slope stability analysis"

He, Jian Ping, and Ya Li Wang. "Stability Analysis and Evaluation of QingXi High-Cutting Slope." Applied Mechanics and Materials 438-439 (October 2013): 1376–79. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.1376.

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Rock nature is mainly controlled by joint-fissur, the stability of rock slope is mainly controlled by the joint surface, the destruction of the slope caused wedge instability formed by joint plane cutting. Stereographic projection can analyze simply and intuitively spatial association relations of straight line and plane in geological body, judge high-cutting slope stability and decisive factor of judge stability of high-cutting slope by means of direction and tendency relationship of rock slope and structural plane. This paper uses stereographic projection to analyze and judge high-cutting slope stability formed by artificial mechanical excavation in Qingxi, and decisive factor of stability according to deformation and fracture and the trends in the high-cutting slope regional, puts forward the high-cutting slope control measures and methods to ensure slope stability and security.

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Wei, Fang. "Regional Stability Analysis of Red Clay Slope Based on Different Failure Modes: A Case Study in Taizaifu Area, Fukuoka." Advances in Civil Engineering 2019 (October 15, 2019): 1–11. http://dx.doi.org/10.1155/2019/1269832.

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Red clay slopes have different failure modes in different geological and climatic contexts. Underlying weak layers are frequently witnessed in integral failures because of the reverse consolidation characteristics. On the contrary, heavy rainfall often causes superficial sliding for a considerable infiltration through developed microfractures. Based on the Geographic Information System, regional stability of red clay slopes was evaluated with two failure modes, such as “integral sliding” and “planar sliding.” First, terrain and borehole data of the study area were used to construct the digital elevation model. Second, slope units were partitioned as research objects. For integral sliding, the slip surface was supposed to lie above the strata interface, and it was regarded as a lower part of an ellipsoid. After calculating safety factors of potential slip surfaces that were randomly generated by the Monte Carlo method, the minimum safety factor of the slope unit and the critical slip surface could be determined. For shallow landslides triggered by rainfall infiltration, the one-dimensional infiltration model and infinite slope model were used. Moreover, the difference between the sliding direction of each column and the main aspect of entire slope unit was considered in safety factor calculation. Finally, regional slope stability characterized by the safety factor would be available; thus, it would be beneficial to sliding prevention and disaster treatment in this region.

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Lafleur, J., V. Silvestri, R. Asselin, and M. Soulié. "Behaviour of a test excavation in soft Champlain Sea clay." Canadian Geotechnical Journal 25, no. 4 (November 1, 1988): 705–15. http://dx.doi.org/10.1139/t88-081.

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The field observations made during a sloped excavation in a soft sensitive clay are presented. The test site is located in Saint-Hilaire, in a typical Champlain Sea clay deposit, of 30 m depth. The trench was 8 m deep and 60 × 60 m square and its slopes were at 45, 34, 27, and 18° to the horizontal. The induced pore pressures and total lateral stresses have been recorded with vibrating-wire instruments since the beginning of the excavation. The steepest, 45° slope completely failed 1 day after excavating and the 34° slope, 2 weeks after. The piezometer readings have shown that the groundwater regime was modified proportionally to the changes in total stresses; these modifications took place within a time period of 5 months, after which the heads became more or less constant. The total stress cells indicated significant rotation of the principal axes at the toe of the slopes. Stability analyses using the lowest vane strength profile gave minimum factors of safety of 1.15 for the 45° slope and 1.23 for the 34° slope, thereby underestimating the risks of failure. Back analyses using regional effective shear strength parameters were made and the parameters mobilized at failure were found to be [Formula: see text] and [Formula: see text]. Key words: case record, excavation, soft clay, slope stability, back analysis.

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Yu, Guo, Mowen Xie, and Yong Li. "Evaluation methods of regional bank slope stability based on geographic information systems and integrated information model." Journal of Geography and Cartography 5, no. 1 (January 26, 2022): 7. http://dx.doi.org/10.24294/jgc.v5i1.1411.

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Through the combination of the geographic information systems (GIS) and the integrated information model, the stability of regional bank slope was comprehensively evaluated. First, a regional bank slope stability evaluation index system was established through studying seven selected factors (slope grade, slope direction, mountain shadow, elevation, stratigraphic lithology, geological structure and river action) that have an impact on the stability of the slope. Then, each factor was rasterized by GIS. According to the integrated information model, the evaluation index distribution map based on rasterized factors was obtained to evaluate the stability of the regional bank slope. Through the analysis of an actual project, it was concluded that the geological structure and stratigraphic lithology have a significant impact on the evaluation results. Most of the research areas were in the relatively low stable areas. The low and the relatively low stable areas accounted for 15.2% and 51.5% of the total study area respectively. The accuracy of slope evaluation results in the study area reached 95.41%.

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Bravo-Zapata, Matías F., Enrique Muñoz, Pablo Lapeña-Mañero, José Miguel Montenegro-Cooper, and Robert W. King. "Analysis of the Influence of Geomechanical Parameters and Geometry on Slope Stability in Granitic Residual Soils." Applied Sciences 12, no. 11 (May 31, 2022): 5574. http://dx.doi.org/10.3390/app12115574.

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Granitic residual soils are soils formed by the in situ weathering of intrusive granitic rocks and are present in different parts of the world. Due to their large presence, many civil engineering projects are carried out on and within these soils. Therefore, a correct characterization of the slopes is necessary for slope stability studies. This investigation aims to study the influence of the values of geomechanical parameters (specific weight, cohesion, and friction angle) and the geometry of a slope (height and inclination) on slope stability of residual granitic soils in dry and static conditions. To this end, an automatic system was developed for the numerical study of cases using the finite element method with limit analysis. The system allows modeling, through Monte Carlo simulation and different slope configurations. With this system, the safety factors of 5000 cases were obtained. The results of the models were processed through the SAFE toolbox, performing a Regional Sensitivity Analysis (RSA). The results of this research concluded that the order of influence of the factors were: slope angle > slope height > cohesion > friction angle > unit weight (β > H > c > ϕ > γ).

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Ge, Qi, He Wu, and Ya Feng Gong. "Research on the Soil Slope Stability Based on Soil Strength Deterioration in Seasonal Frozen Areas." Advanced Materials Research 243-249 (May 2011): 4270–73. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4270.

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Soil slope is one of the main parts of the road engineering. The stability of the slope is an essential prerequisite to ensure the safe operation of road transport. In seasonal frozen regions, shallow landslide hazards in soil slopes usually happen, which pose a serious threat to road safety operations. During the melting process, there forms stagnant water lubrication between the melting soil and freezing soil interface, which constitutes the weak interface of landslide hazard. Special methods to form the freezing – thawing (F-T) surface is designed, and takes consider the interface strength as the foundation of experimental tests, then opening to research the soil slope stability. Safety factor modification of the soil slope is presented. The conclusions of this paper present well theoretical and applied value to the regional slope failure analysis.

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Wang, Liang Qing, P. H. S. W. Kulatilake, Hui Ming Tang, and Ye Liang. "Rock Slope Stability Study for Yujian River Dam Site Based on Kinematic Analyses." Advanced Materials Research 446-449 (January 2012): 2048–55. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.2048.

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Lithological information, rock mass fracture data and discontinuity shear strength obtained through field investigations have been used in conducting kinematic analyses for the rock slopes that exist in the Yujian River dam site to evaluate the stability of the slopes. Results given in the paper can be considered as conservative because of several conservative assumptions used in the analyses. Dam site slopes seem quite stable up to 40º dip angle. Out of the three basic failure modes, possible wedge sliding seems to be the most likely one followed up with possible plane sliding as the second. Irrespective of the considered slope regions, slope dip direction ranges 270-315º and 200-210º seem to be the worst cases for possible instability of slopes in the dam site. Regional slopes in the dam site can be ranked with respect to safety from the lowest to highest in the following order: R-c-1, R-e-2, R-c-2, R-d-1, R-b, R-a, R-d-2 and R-e-1. Note that the dam site slopes are currently stable and the existing slope angles agree well with the results obtained from the rock slope stability analyses.

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López-Vinielles, Juan, José A. Fernández-Merodo, Pablo Ezquerro, Juan C. García-Davalillo, Roberto Sarro, Cristina Reyes-Carmona, Anna Barra, et al. "Combining Satellite InSAR, Slope Units and Finite Element Modeling for Stability Analysis in Mining Waste Disposal Areas." Remote Sensing 13, no. 10 (May 20, 2021): 2008. http://dx.doi.org/10.3390/rs13102008.

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Slope failures pose a substantial threat to mining activity due to their destructive potential and high probability of occurrence on steep slopes close to limit equilibrium conditions, which are often found both in open pits and in waste and tailing disposal facilities. The development of slope monitoring and modeling programs usually entails the exploitation of in situ and remote sensing data, together with the application of numerical modeling, and it plays an important role in the definition of prevention and mitigation measures aimed at minimizing the impact of slope failures in mining areas. In this paper, a new methodology is presented; one that combines satellite radar interferometry and 2D finite element modeling for slope stability analysis at a regional scale, and applied within slope unit polygons. Although the literature includes many studies applying radar interferometry and modeling for slope stability analysis, the addition of slope units as input data for radar interferometry and modeling purposes has, to our knowledge, not previously been reported. A former mining area in southeast Spain was studied, and the method proved useful for detecting and characterizing a large number of unstable slopes. Out of the 1959 slope units used for the spatial analysis of the radar interferometry data, 43 were unstable, with varying values of safety factor and landslide size. Out of the 43 active slope units, 21 exhibited line of sight velocities greater than the maximum error obtained through validation analysis (2.5 cm/year). Finally, this work discusses the possibility of using the results of the proposed approach to devise a proxy for landslide hazard. The proposed methodology can help to provide non-expert final users with intelligible, clear, and easily comparable information to analyze slope instabilities in different settings, and not limited to mining areas.

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Deng, Yuan-Chang, Jin-Hung Hwang, and Yu-Da Lyu. "Developing Real-Time Nowcasting System for Regional Landslide Hazard Assessment under Extreme Rainfall Events." Water 13, no. 5 (March 8, 2021): 732. http://dx.doi.org/10.3390/w13050732.

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In this research, a real-time nowcasting system for regional landslide-hazard assessment under extreme-rainfall conditions was established by integrating a real-time rainfall data retrieving system, a landslide-susceptibility analysis program (TRISHAL), and a real-time display system to show the stability of regional slopes in real time and provide an alert index under rainstorm conditions for disaster prevention and mitigation. The regional hydrogeological parameters were calibrated using a reverse-optimization analysis based on an RGA (Real-coded Genetic Algorithm) of the optimization techniques and an improved version of the TRIGRS (Transient Rainfall Infiltration and Grid-based Regional Slope-Stability) model. The 2009 landslide event in the Xiaolin area of Taiwan, associated with Typhoon Morakot, was used to test the real-time regional landslide-susceptibility system. The system-testing results showed that the system configuration was feasible for practical applications concerning disaster prevention and mitigation.

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Masi, Elena Benedetta, Samuele Segoni, and Veronica Tofani. "Root Reinforcement in Slope Stability Models: A Review." Geosciences 11, no. 5 (May 13, 2021): 212. http://dx.doi.org/10.3390/geosciences11050212.

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The influence of vegetation on mechanical and hydrological soil behavior represents a significant factor to be considered in shallow landslides modelling. Among the multiple effects exerted by vegetation, root reinforcement is widely recognized as one of the most relevant for slope stability. Lately, the literature has been greatly enriched by novel research on this phenomenon. To investigate which aspects have been most treated, which results have been obtained and which aspects require further attention, we reviewed papers published during the period of 2015–2020 dealing with root reinforcement. This paper—after introducing main effects of vegetation on slope stability, recalling studies of reference—provides a synthesis of the main contributions to the subtopics: (i) approaches for estimating root reinforcement distribution at a regional scale; (ii) new slope stability models, including root reinforcement and (iii) the influence of particular plant species, forest management, forest structure, wildfires and soil moisture gradient on root reinforcement. Including root reinforcement in slope stability analysis has resulted a topic receiving growing attention, particularly in Europe; in addition, research interests are also emerging in Asia. Despite recent advances, including root reinforcement into regional models still represents a research challenge, because of its high spatial and temporal variability: only a few applications are reported about areas of hundreds of square kilometers. The most promising and necessary future research directions include the study of soil moisture gradient and wildfire controls on the root strength, as these aspects have not been fully integrated into slope stability modelling.

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Більше джерел

Дисертації з теми "Regional slope stability analysis"

Rajaguru, Mudiyanselage Thilanki Maneesha Dahigamuwa. "Enhancement of Rainfall-Triggered Shallow Landslide Hazard Assessment at Regional and Site Scales Using Remote Sensing and Slope Stability Analysis Coupled with Infiltration Modeling." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7562.

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Landslides cause significant damage to property and human lives throughout the world. Rainfall is the most common triggering factor for the occurrence of landslides. This dissertation presents two novel methodologies for assessment of rainfall-triggered shallow landslide hazard. The first method focuses on using remotely sensed soil moisture and soil surface properties in developing a framework for real-time regional scale landslide hazard assessment while the second method is a deterministic approach to landslide hazard assessment of the specific sites identified during first assessment. In the latter approach, landslide inducing transient seepage in soil during rainfall and its effect on slope stability are modeled using numerical analysis. Traditionally, the prediction of rainfall-triggered landslides has been performed using pre-determined rainfall intensity-duration thresholds. However, it is the infiltration of rainwater into soil slopes which leads to an increase of porewater pressure and destruction of matric suction that causes a reduction in soil shear strength and slope instability. Hence, soil moisture, pore pressure and infiltration properties of soil must be direct inputs to reliable landslide hazard assessment methods. In-situ measurement of pore pressure for real-time landslide hazard assessment is an expensive endeavor and thus, the use of more practical remote sensing of soil moisture is constantly sought. In past studies, a statistical framework for regional scale landslide hazard assessment using remotely sensed soil moisture has not been developed. Thus, the first major objective of this study is to develop a framework for using downscaled remotely sensed soil moisture available on a daily basis to monitor locations that are highly susceptible to rainfall- triggered shallow landslides, using a well-structured assessment procedure. Downscaled soil moisture, the relevant geotechnical properties of saturated hydraulic conductivity and soil type, and the conditioning factors of elevation, slope, and distance to roads are used to develop an improved logistic regression model to predict the soil slide hazard of soil slopes using data from two geographically different regions. A soil moisture downscaling model with a proven superior prediction accuracy than the downscaling models that have been used in previous landslide studies is employed in this study. Furthermore, this model provides satisfactory classification accuracy and performs better than the alternative water drainage-based indices that are conventionally used to quantify the effect that elevated soil moisture has upon the soil sliding. Furthermore, the downscaling of soil moisture content is shown to improve the prediction accuracy. Finally, a technique that can determine the threshold probability for identifying locations with a high soil slide hazard is proposed. On the other hand, many deterministic methods based on analytical and numerical methodologies have been developed in the past to model the effects of infiltration and subsequent transient seepage during rainfall on the stability of natural and manmade slopes. However, the effects of continuous interplay between surface and subsurface water flows on slope stability is seldom considered in the above-mentioned numerical and analytical models. Furthermore, the existing seepage models are based on the Richards equation, which is derived using Darcy’s law, under a pseudo-steady state assumption. Thus, the inertial components of flow have not been incorporated typically in modeling the flow of water through the subsurface. Hence, the second objective of this study is to develop a numerical model which has the capability to model surface, subsurface and infiltration water flows based on a unified approach, employing fundamental fluid dynamics, to assess slope stability during rainfall-induced transient seepage conditions. The developed model is based on the Navier-Stokes equations, which possess the capability to model surface, subsurface and infiltration water flows in a unified manner. The extended Mohr-Coulomb criterion is used in evaluating the shear strength reduction due to infiltration. Finally, the effect of soil hydraulic conductivity on slope stability is examined. The interplay between surface and subsurface water flows is observed to have a significant impact on slope stability, especially at low hydraulic conductivity values. The developed numerical model facilitates site-specific calibration with respect to saturated hydraulic conductivity, remotely sensed soil moisture content and rainfall intensity to predict landslide inducing subsurface pore pressure variations in real time.

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RAIMONDI, LUCA. "Valutazione e mitigazione dei rischi geo-idrologici derivanti da eventi catastrofici nell'area del Parco Nazionale delle Cinque Terre." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1007965.

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This research is included in the field of studies for the evaluation and mitigation of geo-hydrological risks deriving from catastrophic rainfall events conducted in the Cinque Terre National Park area (Liguria) by the Department of Earth Sciences of the Environment and Life of University of Genoa (Italy). This activity made it possible to create and test a mathematical simulation model, in a physically based GIS environment, capable of carrying out 3D slope stability analysis (extended to a spatial domain) according to the pluviometric conditions assumed in the calculations. The experimentation first highlighted the limits of application of the "infinte slope" limit equilibrium method (LEM) used for the spatially 3D slope stability analysis in a GIS computerized geographical environment, also indicating improvement solutions for a more correct use. The input parameters of the soils (geotechnical, hydrogeological and geometric) entering the above mathematical expression were then examined. Their spatial distribution and their relationship with the local geo-morphometric-environmental control factors, on a basin and regional scale, were assessed, as well as their influence on the results was tested by comparing them with real phenomena and geomorphological processes observed in the chosen pilot area (i.e. Vernazza catchment affected on 25/10/2011 by a catastrophic rainfall event). All this experimentation led to the formulation of innovative calculation procedures and methods which were then coded in the Python programming language and developed in the open source QGIS application system in the form of executable "scripts". The predictive ability of the new model was tested in the aforementioned basin, comparing the spatial output data derived from the mathematical simulation with the real distribution of the surface landslides obtained from the analysis of aerial photos and site surveys. In summary, the system showed excellent potential for the preventive localization of soil mobilization phenomena on the slopes of a territorial domain where, in a neighborhood of 25 m away from the focal landslide areas, it was able to identify the 84% of the phenomena that actually occurred with a probability of 93% of the total of the aforementioned areas (with only 7% of false alarms).

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Peterson, Jennifer Lynn. "Probability analysis of slope stability." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1070.

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Анотація:

Thesis (Ph. D.)--West Virginia University, 1999.
Title from document title page. Document formatted into pages; contains viii, 91 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 63-64).

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Wanstreet, Pinar. "Finite element analysis of slope stability." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5480.

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Анотація:

Thesis (M.S.)--West Virginia University, 2007.
Title from document title page. Document formatted into pages; contains xii, 86 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 80-82).

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Bakhtiari, Siamak. "Stochastic finite element slope stability analysis." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/stochastic-finite-element-slope-stability-analysis(c1b451d9-8bf6-43ff-9c10-7b5209fb45c1).html.

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In this thesis, the failures that occurred during the construction of the Jamuna Bridge Abutment in Bangladesh have been investigated. In particular, the influence of heterogeneity on slope stability has been studied using statistical methods, random field theory and the finite element method. The research is divided into three main parts: the statistical characterization of the Jamuna River Sand, based on an extensive in-situ and laboratory database available for the site; calibration of the laboratory data against a double-hardening elastoplastic soil model; and stochastic finite element slope stability analyses, using a Monte Carlo simulation, to analyse the slope failures accounting for heterogeneity. The sand state has been characterised in terms of state parameter, a meaningful quantity which can fully represent the mechanical behaviour of the soil. It was found that the site consists of predominantly loose to mildly dilative material and is very variable. Also, a Normal distribution was found to best represent the state parameter and a Lognormal distribution was found to best represent the tip resistance.The calibration of the constitutive model parameters was found to be challenging, as alternative approaches had to be adopted due to lack of appropriate test results available for the site. Single-variate random fields of state parameter were then linked to the constitutive model parameters based on the relationships found between them, and a parametric study of the abutment was then carried out by linking finite elements and random field theory within a Monte Carlo framework.It was found that, as the degree of anisotropy of the heterogeneity increases, the range of structural responses increases as well. For the isotropic cases, the range of responses was relatively smaller and tended to result in more localised failures. For the anisotropic cases, it was found that there are two different types of deformation mechanism. It was also found that, as the vertical scale of fluctuation becomes bigger, the range of possible structural responses increases and failure is more likely. Finally, it was found that the failed zones observed during the excavation of the West Guide Bund of the Jamuna Bridge Abutment could be closely predicted if heterogeneity was considered in the finite element analyses. In particular, it was found that, for such a natural deposit, a large degree of anisotropy (in the range of 20) could account for the deformation mechanisms observed on site.

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Liu, Ying, and 劉影. "Limit equilibrium methods for slope stability analysis." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B42576684.

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GUEDES, MARIA CECILIA SAFADY. "DISCUSSION ON PROBABILISTIC ANALYSIS OF SLOPE STABILITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1924@1.

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Анотація:

COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
São abordados alguns aspectos relativos à execução de análises probabilísticas em projetos de geotecnia. Apresenta-se um resumo dos conceitos de probabilidade e estatística, utilizados ao longo do trabalho. Descreve-se uma metodologia para a obtenção dos dados necessários à análise probabilística, incluindo a quantidade e a localização de amostras, o cálculo das médias e variâncias dos parâmetros do solo e a quantificação das incertezas relativas a estes valores. Apresenta-se o procedimento de execução dos três métodos probabilísticos mais utilizados em geotecnia com ênfase especial para o Método do Segundo Momento de Primeira Ordem. São executadas análises probabilísticas considerando, separadamente, variações de altura e inclinação de um talude de mineração sob condições drenadas. Avalia-se também a aplicação da metodologia de análise probabilística em situações não-drenadas, através da análise da estabilidade de um quebra-mar sobre argila mole.
Some aspects about probabilistic analysis of stability in geotechnical engineering are studied in this thesis. A summary about basic concepts of probability and statistics used along this work is presented. The methodology for obtaining the data needed for probabilistic analysis is described, including quantity and localization of samples, computation of mean and variance of soil properties and determination of uncertainties about these values. The procedures of three probabilistic methods which are useful in geotechnics are presented, with special emphasis on the first order second moment method (FOSM). Probabilistic analysis are made considering independent changes of height and inclination of a mine slope under drained conditions. The application of probabilistic analysis of a breakwater above a soft clay deposit under undrained conditions is also presented.
Se abordan algunos aspectos relativos a la ejecución de análisis probabilístico en proyectos de geotecnia. Se presenta un resumen de los conceptos de probabilidades y estadísticas, utilizados a lo largo del trabajo. Se describe una metodología para la obtención de los datos necesarios para el análisis probabilístico, incluyendo la cantidad y la localización de las muestras, el cálculo de las medias y variancias de los parámetros del suelo y la cuantificación de los errores relativos a estos valores. Se presenta el procedimientode ejecución de los tres métodos probabilísticos más utilizados en geotecnia con énfasis especial para el Método del Segundo Momento de Primer Orden. Se realizan análisis probabilísticos considerando, separadamente, variaciones de altura e inclinación de un talud de mineración en condiciones drenadas. También se evalúa la aplicación de la metodología de análisis probabilística en situaciones no-drenadas, a través de el análisis de la estabilidad de un quebra olas sobre arcilla blanda.

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SANDOVAL, MARTIN ALEXANDER PURIZAGA. "DETERMINISTIC AND PROBABILISTIC ANALYSIS OF SLOPE STABILITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21816@1.

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Анотація:

PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Na abordagem determinística compara-se o método do equilíbrio limite com o método dos elementos finitos na análise 2D da estabilidade de taludes em solo, determinando-se o valor do fator de segurança para vários exemplos de aplicação. No método dos elementos finitos quantifica-se a região da potencial superfície de ruptura que se comporta sob extensão, analisando-se a ocorrência de anisotropia de resistência ao longo da potencial superfície de deslizamento para situações envolvendo diferentes tipos de solo, ângulos de inclinação do talude e sequências de escavação. Conclui-se que o efeito da anisotropia é pouco significativo quando o ângulo de atrito do solo exceder a 10 graus. Por outro lado, devido à crescente aplicação da abordagem probabilística na prática da engenharia geotécnica, foram realizadas análises de confiabilidade de taludes empregando os métodos de Monte Carlo, do hipercubo latino e o método das estimativas pontuais alternativas, comparando-se os diferentes resultados obtidos e discutindo as principais vantagens da aplicação destes métodos.
In the deterministic approach the limit equilibrium method and the finite element method are compared for 2D analysis of soil slope stability, calculating the value of the safety factor in several numerical examples. In the finite element method the region of soil under strain extension is determined and the occurrence of strength anisotropy is investigated along the potential sliding surface for situations involving different types of soil, angles of slope inclination and excavation sequences. It is concluded that the effect of the anisotropy is negligible when the angle of friction is higher than 10 degress. Moreover, due to the increasing application of the probabilistic approach in the practice of geotechnical engineering, some reliability analyses were carried out using the Monte Carlo method, the Latin hypercube method and the method of alternative point estimates, comparing their different outputs and discussing the main advantages of their application in the analysis of soil slope stability problems.

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VECCI, ANDREA NASCIMENTO. "PROBABILISTIC ANALYSIS OF A MINE SLOPE STABILITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35100@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
PROGRAMA DE EXCELENCIA ACADEMICA
BOLSA NOTA 10
Na prática geotécnica, a estabilidade de taludes é atualmente estudada apenas com análises determinísticas, obtendo-se o valor do Fator de Segurança (FS) da estrutura geotécnica. Estas análises são simplificadas, pois fornecem valores de FS sem considerar a variabilidade intrínseca dos solos e rochas. Desprezar as incertezas dos parâmetros geotécnicos pode levar a resultados pouco confiáveis sobre a segurança de taludes. Análises fundamentadas em conceitos estatísticos, chamadas probabilísticas, passam ser mais frequentes na geotecnia por permitirem considerar efeitos da variabilidade inerente aos materiais. Estas análises incorporam elementos estatísticos que possibilitam tratar FS como uma função e estudar suas propriedades. Como resultados finais, os métodos probabilísticos fornecem o índice de confiabilidade (beta) e a probabilidade de ruptura (Pr) da estrutura averiguada. Este trabalho aplica análises determinísticas e probabilísticas de um talude de 200m de altura da Mina do Cauê, Itabira, MG. A estabilidade do talude foi analisada por cinco métodos determinísticos usuais e três probabilísticos (FOSM, EP e MC). Os resultados indicam que a fixação da superfície crítica de ruptura fornece, em geral, valores de beta e Pr semelhantes aos obtidos quando a superfície pode variar livremente. Com a superfície crítica fixa observou-se, também, que os resultados de beta e Pr do talude variam significativamente com o método de equilíbrio limite adotado. Após comparação dos resultados, pode-se recomendar o uso de análises probabilísticas FOSM com base no método de Morgenstern-Price em análises semelhantes ao caso estudado.
In current geotechnical practice, slope stability assessments are usually carried out only based on deterministic methods, obtaining a value of Safety Factor (FS). These analyses are simplified because the FS values do not consider the natural variability of soils and rocks. Disregarding the uncertainties inherent to geotechnical parameters may lead to unreliable results of slope safety. Probabilistic analyses, based on statistical concepts, have become more frequent in geotechnical practice, as they allow incorporating the materials intrinsic variability. These analyses are based on statistical elements that allow treating the FS as a function and studying its properties. The probabilistic methods indicate the reliability index (beta) and the probability of failure (Pr) of the verified geotechnical structure. This work presents deterministic and probabilistic analyses of a 200m high slope at the Cauê Mine, located in Itabira, Minas Gerais, Brazil, with basis on five usual deterministic methods and three probabilistic techniques (FOSM, Point Estimates and Monte Carlo). The results indicate that fixing the critical deterministic surface generally gives values of beta and Pr similar to those achieved when the surface is free to vary. It was also concluded that, with a fixed critical surface, beta and Pr results change significantly, when different Limit Equilibrium methods are adopted. It is recommended to use probabilistic FOSM analysis with Morgenstern and Price stability method in analyses similar to the one presented herein.

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Howdyshell, James Robert. "Strain Compatibility Analysis in Slope Stability Modeling." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1269113810.

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Книги з теми "Regional slope stability analysis"

Giani, Gian Paolo. Rock slope stability analysis. Rotterdam: Balkema, 1992.

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Zhang, Ke. Failure Mechanism and Stability Analysis of Rock Slope. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5743-9.

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Huang, Yang H. Slope stability analysis by the limit equilibrium method. Reston, Virginia: ASCE Press, 2014.

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Cheng, Y. M. Slope stability analysis and stabilization: New methods and insight. London: Routledge, 2008.

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Cao, Zijun, Yu Wang, and Dianqing Li. Probabilistic Approaches for Geotechnical Site Characterization and Slope Stability Analysis. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-52914-0.

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Denby, B. The influence of groundwater pressure on mine slope stability analysis. S.l: s.n, 1985.

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Gerstel, Wendy J. Slope stability analysis of the bluffs along the Washington State Capitol Campus, Olympia, Washington. Olympia, WA: Washington Dept. of Natural Resources, Division of Geology and Earth Resources, 1996.

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Baum, Rex L. Slope stability of proposed ski facilities at the southeast side of Snodgrass Mountain, Gunnison County, Colorado. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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Zaki, Atila. Non-circular slope stability analysis using the generalized wedge method with modifications and extensions for application in rock engineering. Ottawa: National Library of Canada, 1999.

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Kesoretskikh, Ivan, and Sergey Zotov. Landscape vulnerability: concept and assessment. ru: INFRA-M Academic Publishing LLC., 2019. http://dx.doi.org/10.12737/1045820.

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The monograph presents a methodology for assessing the vulnerability of landscapes to external influences. A comparative analysis of the concepts of "stability", "sensitivity", "vulnerability" in relation to natural complexes. An overview of existing methods for assessing the vulnerability of natural complexes is presented. The author's method of assessing the vulnerability of landscapes to anthropogenic impacts is described. The methodology is based on: selection and justification of criteria for assessing the vulnerability of landscapes; preparation of a parametric matrix and gradation of assessment criteria in accordance with the developed vulnerability classes; calculation of weighting factors of vulnerability assessment parameters; selection of optimal territorial operational unit for landscape vulnerability assessment. The method is implemented in the GIS environment "Assessment of vulnerability of landscapes of the Kaliningrad region to anthropogenic impacts", created by the authors using modern geoinformation products. The specificity of spatial differentiation of different landscapes in terms of vulnerability to anthropogenic impacts at the regional and local levels is revealed. It is stated that the use of the methodology for assessing the vulnerability of landscapes to anthropogenic impacts and its integration into the system of nature management will ensure a balanced account of geoecological features and environmental priorities in territorial planning. It is of interest to specialists in the field of rational nature management, environmental protection, spatial planning.

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Marjanović, Miloš, Biljana Abolmasov, Igor Peshevski, James Reeves, and Irena Georgievska. "Regional Slope Stability Analysis in Landslide Hazard Assessment Context, North Macedonia Example." In Understanding and Reducing Landslide Disaster Risk, 267–73. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60227-7_29.

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Khemissa, Mohamed, and Ahmed Seddiki. "Seismic Stability Analysis and Stabilization of an Unstable Urbanized Slope." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1881–82. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_543.

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Nichols, Ian, John S. Gierke, Thomas Oommen, and Maria Diletta Acciaro. "Significance of the Spatial Resolution of DEM in Regional Slope Stability Analysis Enguri Dam, Republic of Georgia." In Building Knowledge for Geohazard Assessment and Management in the Caucasus and other Orogenic Regions, 281–300. Dordrecht: Springer Netherlands, 2021. http://dx.doi.org/10.1007/978-94-024-2046-3_15.

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Huang, Chuanzhi. "Slope Stability." In Limit Analysis Theory of the Soil Mass and Its Application, 363–414. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1572-9_10.

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Changwei, Yang, Zhang Jingyu, Lian Jing, Yu Wenying, and Zhang Jianjing. "Numerical Analysis Research." In Slope Earthquake Stability, 91–119. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2380-4_4.

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Changwei, Yang, Zhang Jingyu, Lian Jing, Yu Wenying, and Zhang Jianjing. "Seismic Array Monitoring Results Analysis." In Slope Earthquake Stability, 19–30. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2380-4_2.

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Couture, R., S. G. Evans, J. Locat, J. Hadjigeorgiou, and P. Antoine. "A proposed methodology for rock avalanche analysis." In Slope Stability Engineering, 1369–78. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203739600-129.

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Young, D. S., and S. Pumjan. "A localized probabilistic approach for slope stability analysis." In Slope Stability Engineering, 1085–88. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203739600-78.

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Chandler, R. J., and S. Schina. "Landslide at Malakasa, Greece: Investigation, analysis, remedial works." In Slope Stability Engineering, 775–80. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203739600-21.

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Dantas, Bruno Teixeira, and Maurício Ehrlich. "Numerical analysis of reinforced soil slopes under working stress conditions." In Slope Stability Engineering, 1055–60. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203739600-72.

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Тези доповідей конференцій з теми "Regional slope stability analysis"

Chan, C. L., L. A. Wong, W. W. C. Leung, P. W. K. Chung, M. K. Lo, and Andy Y.F. Leung. "Development of Regional Soil Shear Strength Database and Its Application in Probabilistic Analysis of Slope Stability." In International Symposium for Geotechnical Safety & Risk. Singapore: Research Publishing Services, 2022. http://dx.doi.org/10.3850/978-981-18-5182-7_00-10-011.xml.

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Mollaert, Justine, and Abbass Tavallali. "Including the Influence of Waves in the Overall Slope Stability Analysis of Rubble Mound Breakwaters." In The 13th Baltic Sea Region Geotechnical Conference. Vilnius Gediminas Technical University, 2016. http://dx.doi.org/10.3846/13bsgc.2016.027.

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An offshore breakwater is designed for the construction of a LNG-terminal. For the slope stability analysis of the rubble mound breakwater the existing and the extreme wave climate are considered. Pore water pressure variations exist in the breakwater and its permeable foundation. A wave trough combined with the moment of maximum wave run-up results in a decrease and increase of the pore water pressure, respectively. Therefore, the wave actions have on overall effect on the slope stability of the breakwater. To include the wave actions in the slope stability analysis a simplified method is used. For the slope stability analysis, a specific piezometric line is determined. This piezometric line consists of a wave profile and the profile of wave run-up. The slope stability analysis are performed with GEO-SLOPE/W 2007. For the geotechnical design of the breakwater load cases of extreme and normal waves combined with, respectively, extreme and normal water levels are analysed. All the load cases which included the wave actions result in lower stability safety factors than the load cases with only still water levels. Therefore the wave actions are the determining load case for the geotechnical stability of the breakwater and it should be studied in detail.

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Isherwood, Andy, Alan Samcheck, and Wayne Savigny. "Deformation Analysis of a Pipeline River Crossing." In 2002 4th International Pipeline Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ipc2002-27343.

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In Manitoba, the Main (100) Line operated by TransCanada PipeLines Ltd. (TCPL) comprises six natural gas pipelines ranging from 864 mm to 1219 mm in diameter. These pipelines cross the La Salle River at Main Line Valve (MLV) 39+6.06, approximately 3 km south of St. Norbert, Manitoba. A rupture in Line 100-2 occurred at this crossing site on April 15, 1996. Investigations of the site following the line break concluded that ground movement associated with the east approach slope was likely a contributing factor in the failure of Line 100-2. It was postulated that the observed slope instability was attributable, at least in part, to a combination of the low shear strength of Lake Agassiz clay and artesian pore pressures associated with the underlying regional Upper Carbonate Aquifer (UCA), controlled in part by groundwater pumping within the City of Winnipeg. Based on the findings from the initial slope stability analyses, a more detailed deformation analysis was proposed to examine the influence of hydrogeological conditions on deformation and slope stability at the La Salle site. The numerical analyses were conducted using FLAC2D, a two-dimensional explicit finite difference code for engineering mechanics computation. The code simulates the pre- and post-peak behaviour of geological and other materials based on specified material properties, constitutive models, and failure criteria. The deformation analysis has identified the key factors controlling stability of the east approach slope at the La Salle site, and has provided insight into probable failure mechanisms. High pressures in the UCA increase the risk of sudden large-scale slope failure at the slope toe at critical times during the year, e.g., after rapid drawdown following the spring flood, and following the drop in river level in late fall to winter levels. The analysis indicated that the risk of slope instability at this site can be reduced by lowering the aquifer pressure locally in the vicinity of the east approach slope at critical times in the year. The results of the study have demonstrated the usefulness of employing deformation analysis as a means of understanding the key factors controlling slope stability at a particular site. The approach is also compatible with the development of a comprehensive soil/pipe interaction methodology that integrates the results of ongoing in situ monitoring into pipe stress analyses.

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Xiuzhen Li. "Distance discriminant analysis method for stability prediction of rock slope in hydropower engineering regions." In 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5987637.

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Ma, T., B. Cami, S. Javankhoshdel, T. Yacoub, B. Corkum, and J. Curran. "Effect of Disturbance Factor Distribution Function on Stability of an Open Pit Mine." In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-2221.

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ABSTRACT: The disturbance factor (D) is a parameter in the Generalized Hoek-Brown failure criterion for rock slopes in slope stability. It represents the subsurface damage to the rock material properties resulting from blasting and stress relaxation during excavations. Within the region of assumed damage, a number between zero (undisturbed) and unity (very disturbed) is prescribed as the value of the disturbance factor. Most commonly a uniform value of D is assumed within the entire region of damage, but little research has been done to study the impact of the variation in the D parameter on stability. Through use of an example, this paper examines the effect of various distribution functions of D through the damaged region, such namely, as constant, linearly varying, and exponentially varying. The failure surfaces and factors of safety for the slope as determined via limit equilibrium are also compared with finite element analyses. Varying the distribution of the damage function was found to significantly affect the failure surface and factor of safety. It is recommended that practitioners adopt care to select an appropriate distribution for slope stability analysis. 1. BACKGROUND The Generalized Hoek-Brown method (Hoek and Brown 2018) is widely used for determining rock mass strength in rock mechanics. One application of this method is in the design of open pits in rock masses which requires the evaluation of factor of safety against overall sliding. During excavation, subsurface damage can occur to the surrounding rock masses and cause fracturing. The damage can be caused by two sources: (a) blasting and (b) stress relaxation (Hoek et al. 2002), and can be quantified in the form of a disturbance factor, D, which ranges from a zero (undisturbed) to unity (disturbed) within the rock masses. For slope stability, the shear strength of the rock activated along the slip surface can be obtained by solving Eq. (1) to Eq. (4) (Hoek et al. 2018).

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Yan, Zhiduo, Weichen Ding, and Liang Pang. "The Study on the Risk Analysis of Submarine Landslide in the Continental Slope Region of Northern South China Sea." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54898.

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Abundant oil and gas resources are stored in the continental slope region of northern South China Sea. However, due to the submarine landslide disasters, submarine pipelines and cables and other submarine facilities were damaged, which seriously affected the development of oil and gas resources, leading to a huge economic losses. In order to ensure the safe operation of the submarine gas pipeline, it is necessary to carry out some researches in the submarine slope stability. In this paper, an uncertainty analysis method is applied and a distribution model which is suitable for slope stability influencing factors of this region is put forward. In addition, the risk of submarine slope is analyzed, plotting submarine landslide risk evaluation maps. Different stochastic characteristics of variables such as water depth, angle of slope, shear strength and earthquake acceleration etc can be reflected reasonably, which is helpful for the safety of oil and gas transportation.

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Kaczmarek, Łukasz. "Complex Analysis of the Impact of Construction of an Underground Metro Line on the Urban Environment – a Case Study from the Vistula Valley in Warsaw." In The 13th Baltic Sea Region Geotechnical Conference. Vilnius Gediminas Technical University, 2016. http://dx.doi.org/10.3846/13bsgc.2016.040.

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Underground construction in urban areas is a complex investment, impacting existing buildings. The paper presents a case study of the 2nd metro line, in close proximity to the Warsaw Slope (Kaczmarek, Popielski 2016; Kaczmarek et al. 2016). First the digital terrain model was analysed. Next the prospection of electrical resistivity imaging (ERI) were performed. In addition results of archive boreholes were correlated to ERI outcome. Then complementary laboratory tests (e. g. triaxal CU tests) were carried out. Furthermore the prisms located on the Warsaw Slope were measured with tacheometric technique. This results were merged to archive monitoring observations of slope surface deformation and near building settlements. Based on previous steps the finite element method (FEM) simulations were performed. Thanks to numerical analysis cumulative settlements of a particular building above the metro tunnel were calculated. The values of vertical displacements does not affect the stability of the building or the slope nearby. Nevertheless, it can impact serviceability. Furthermore, the value of the calculated Safety Factor of the Warsaw Slope in this section is 1.1. Hence, slope changes require continuous observations. The presented case study shows the usefulness of complex research analysis and its suitability for the purposes of building an extension of the 2nd metro line.

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Palese, Michael, Allan M. Zarembski, and Joseph Palese. "Landslide Risk Assessment in Cut Locations Using Right of Way Videos and Artificial Intelligence." In 2022 Joint Rail Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/jrc2022-78162.

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Abstract Sidehill and through cuts are often used in the construction of new rail systems to reduce the length, curvature, and grade of the route to increase operation efficiency. Consequently, rights-of-way that utilize cuts are susceptible to damage from slope failure events such as shallow-rapid landslides and rock-falls. At-risk slopes, or geohazards, are traditionally assigned severity grades using slope stability analysis methods derived from intensive field investigations and historical failures. Anticipating slope failures that may occur due to common weather events in the region helps protect railroad assets and ensure safe operations. This research aimed to create a new slope stability analysis method by processing digital images of the railroad right-of-way recorded by inspection vehicles. Computer vision techniques were used to identify and quantify geohazard features that indicated slope instability. Specifically, an object detection algorithm was trained with a set of right-of-way images where features of concern were labeled and located. These features, along with digital elevation maps of the track section, can then be used to develop a relative risk assessment algorithm to grade each geohazard’s landslide likelihood. The resulting algorithm would provide a geohazard risk index that can be determined from publicly available data and video recordings from inspection vehicles and can be used by railroads to mitigate the potential damage from a landslide event.

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Alaqeely, Razan, Mohammad AlDosari, Nadir Babay, Al-Hussain Abdulbari, Ala Ba Hadi, Faycal Ben Yahia, and Mohannad Abdulghani. "A 3D Finite Element Analysis Study of the Jawbones Response to Osseodensification and Conventional Drilling." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23669.

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Abstract Osseodensification is used to densify natural bone and increase dental implant stability. This work aims to compare, using finite element analysis, the stress generated on different jawbone areas between conventional drilling (OD) and osseodensification drilling (CD). Cone-beam CT scans of four different edentulous patients were obtained. Implant insertion and removal in the four bone models were simulated for the two different drilling techniques. Materials distribution was set as homogeneous throughout each part. In the OD technique, a new densified region was formed with new material properties based on a relation between density and elasticity. Material distribution of the densified regions was assumed to be a non-homogenous linear pattern and its gradual variation complies with the graph-related slope equations. Von-Mises stress for cortical and trabecular bone was significantly higher in the CD model in comparison to their values in the OD, as densified regions have absorbed most of the stresses and restricted their propagation. The same phenomenon was observed in the implant pull-out bone model. The OD technique was found to affect the primary stability of dental implants positively. The bone types present in different jawbone regions react differently to this technique according to the percentage of trabecular bone to cortical bone.

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Si, Jinzhao, Shuangcheng Zhang, and Yufen Niu. "PS-InSAR and UAV technology used in the stability study of Ankang expansive soil airport." In 5th Joint International Symposium on Deformation Monitoring. Valencia: Editorial de la Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/jisdm2022.2022.13869.

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Expansive soil is a natural geological body with obvious expansion and contraction, multiple fissures and other undesirable properties. The deformation monitoring of expansive soil in high-fill areas under the combined action of wet expansion and dry contraction has become a hotspot of related research. to large-scale soil disasters. Time-series Interferometric Synthetic Aperture Radar (InSAR) technology is widely used in the monitoring of various geological hazards due to its advantages of wide coverage, high monitoring accuracy, and all-weather operation. This study takes Ankang Airport (AKA) expansive soil airport as an example. First, the ground digital elevation model (DEM) of the airport filling area was obtained by using UAV; secondly, the deformation rate and deformation time series of the expansive soil airport were obtained by using the persistent scatterer InSAR (PS-InSAR) technology; third, for the coherence In poor areas, artificial corner reflectors (CR) are arranged to increase stable scattering points; Finally, the deformation time series of feature points are extracted, combined with regional precipitation data analysis, the relationship between the periodic deformation of the airport expansive soil slope and rainfall. There is a subsidence trend along the LOS direction in the dry season, which is consistent with the expansion and contraction characteristics of expansive soils. Finally, the deformation rate is proportional to the depth of the expansive soil fill. It is judged that the existing small surface deformation and its periodic deformation distribution are caused by the combined action of the settlement after construction of the expansive soil filling area and the expansion and contraction characteristics of the expansive soil.

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Звіти організацій з теми "Regional slope stability analysis"

Hamdhan, Indra Noer, and Helmut F. Schweiger. Slope Stability Analysis of Unsaturated Soil with Fully Coupled Flow-Deformation Analysis. Cogeo@oeaw-giscience, September 2011. http://dx.doi.org/10.5242/iamg.2011.0063.

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Mosher, D. C., K. MacKillop, V. Latour, G. Fenton, and P. Mitchelmore. Regional slope stability assessment: Challenges in spatial and stratigraphic geologic and geotechnical data integration. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2010. http://dx.doi.org/10.4095/285475.

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Thomaz, Jose. A General Method for Three Dimensional Slope Stability Analysis : Informational Report. West Lafayette, IN: Purdue University, 1986. http://dx.doi.org/10.5703/1288284314113.

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Carpenter, James. Slope Stability Analysis Considering Tiebacks and Other Concentrated Loads : Informational Report. West Lafayette, IN: Purdue University, 1986. http://dx.doi.org/10.5703/1288284314603.

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Allison, T. The stability of input structures in a supply-driven input-output model: A regional analysis. Office of Scientific and Technical Information (OSTI), June 1994. http://dx.doi.org/10.2172/10158759.

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Miner, Kimberley, and Robin Rodgers. Parts unmapped : linear multi-variate analysis of food, water, and temperature requirements for regional stability. Environmental Research and Development Program (U.S.), April 2019. http://dx.doi.org/10.21079/11681/32565.

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MacKillop, K., D. Ouellette, E. L. King, and S. Blasco. Geotechnical characteristics and slope stability analysis of Beaufort Sea marine sediments, offshore Yukon and Northwest Territories: methodology and results. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329427.

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Over, Thomas, Riki Saito, Andrea Veilleux, Padraic O’Shea, Jennifer Sharpe, David Soong, and Audrey Ishii. Estimation of Peak Discharge Quantiles for Selected Annual Exceedance Probabilities in Northeastern Illinois. Illinois Center for Transportation, June 2016. http://dx.doi.org/10.36501/0197-9191/16-014.

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This report provides two sets of equations for estimating peak discharge quantiles at annual exceedance probabilities (AEPs) of 0.50, 0.20, 0.10, 0.04, 0.02, 0.01, 0.005, and 0.002 (recurrence intervals of 2, 5, 10, 25, 50, 100, 200, and 500 years, respectively) for watersheds in Illinois based on annual maximum peak discharge data from 117 watersheds in and near northeastern Illinois. One set of equations was developed through a temporal analysis with a two-step least squares-quantile regression technique that measures the average effect of changes in the urbanization of the watersheds used in the study. The resulting equations can be used to adjust rural peak discharge quantiles for the effect of urbanization, and in this study the equations also were used to adjust the annual maximum peak discharges from the study watersheds to 2010 urbanization conditions. The other set of equations was developed by a spatial analysis. This analysis used generalized least-squares regression to fit the peak discharge quantiles computed from the urbanization-adjusted annual maximum peak discharges from the study watersheds to drainage-basin characteristics. The peak discharge quantiles were computed by using the Expected Moments Algorithm following the removal of potentially influential low floods defined by a multiple Grubbs-Beck test. To improve the quantile estimates, regional skew coefficients were obtained from a newly developed regional skew model in which the skew increases with the urbanized land use fraction. The skew coefficient values for each streamgage were then computed as the variance-weighted average of at-site and regional skew coefficients. The drainage-basin characteristics used as explanatory variables in the spatial analysis include drainage area, the fraction of developed land, the fraction of land with poorly drained soils or likely water, and the basin slope estimated as the ratio of the basin relief to basin perimeter. This report also provides: (1) examples to illustrate the use of the spatial and urbanization-adjustment equations for estimating peak discharge quantiles at ungaged sites and to improve flood-quantile estimates at and near a gaged site; (2) the urbanization-adjusted annual maximum peak discharges and peak discharge quantile estimates at streamgages from 181 watersheds including the 117 study watersheds and 64 additional watersheds in the study region that were originally considered for use in the study but later deemed to be redundant. The urbanization-adjustment equations, spatial regression equations, and peak discharge quantile estimates developed in this study will be made available in the web-based application StreamStats, which provides automated regression-equation solutions for user-selected stream locations. Figures and tables comparing the observed and urbanization-adjusted peak discharge records by streamgage are provided at http://dx.doi.org/10.3133/sir20165050 for download.

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Cooper, Christopher, Jacob McDonald, and Eric Starkey. Wadeable stream habitat monitoring at Congaree National Park: 2018 baseline report. National Park Service, June 2021. http://dx.doi.org/10.36967/nrr-2286621.

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The Southeast Coast Network (SECN) Wadeable Stream Habitat Monitoring Protocol collects data to give park resource managers insight into the status of and trends in stream and near-channel habitat conditions (McDonald et al. 2018a). Wadeable stream monitoring is currently implemented at the five SECN inland parks with wadeable streams. These parks include Horseshoe Bend National Military Park (HOBE), Kennesaw Mountain National Battlefield Park (KEMO), Ocmulgee Mounds National Historical Park (OCMU), Chattahoochee River National Recreation Area (CHAT), and Congaree National Park (CONG). Streams at Congaree National Park chosen for monitoring were specifically targeted for management interest (e.g., upstream development and land use change, visitor use of streams as canoe trails, and potential social walking trail erosion) or to provide a context for similar-sized stream(s) within the park or network (McDonald and Starkey 2018a). The objectives of the SECN wadeable stream habitat monitoring protocol are to: Determine status of upstream watershed characteristics (basin morphology) and trends in land cover that may affect stream habitat, Determine the status of and trends in benthic and near-channel habitat in selected wadeable stream reaches (e.g., bed sediment, geomorphic channel units, and large woody debris), Determine the status of and trends in cross-sectional morphology, longitudinal gradient, and sinuosity of selected wadeable stream reaches. Between June 11 and 14, 2018, data were collected at Congaree National Park to characterize the in-stream and near-channel habitat within stream reaches on Cedar Creek (CONG001, CONG002, and CONG003) and McKenzie Creek (CONG004). These data, along with the analysis of remotely sensed geographic information system (GIS) data, are presented in this report to describe and compare the watershed-, reach-, and transect-scale characteristics of these four stream reaches to each other and to selected similar-sized stream reaches at Ocmulgee Mounds National Historical Park, Kennesaw Mountain National Battlefield Park, and Chattahoochee National Recreation Area. Surveyed stream reaches at Congaree NP were compared to those previously surveyed in other parks in order to provide regional context and aid in interpretation of results. edar Creek’s watershed (CONG001, CONG002, and CONG003) drains nearly 200 square kilometers (77.22 square miles [mi2]) of the Congaree River Valley Terrace complex and upper Coastal Plain to the north of the park (Shelley 2007a, 2007b). Cedar Creek’s watershed has low slope and is covered mainly by forests and grasslands. Cedar Creek is designated an “Outstanding Resource Water” by the state of South Carolina (S.C. Code Regs. 61–68 [2014] and S.C. Code Regs. 61–69 [2012]) from the boundary of the park downstream to Wise Lake. Cedar Creek ‘upstream’ (CONG001) is located just downstream (south) of the park’s Bannister Bridge canoe landing, which is located off Old Bluff Road and south of the confluence with Meyers Creek. Cedar Creek ‘middle’ and Cedar Creek ‘downstream’ (CONG002 and CONG003, respectively) are located downstream of Cedar Creek ‘upstream’ where Cedar Creek flows into the relatively flat backswamp of the Congaree River flood plain. Based on the geomorphic and land cover characteristics of the watershed, monitored reaches on Cedar Creek are likely to flood often and drain slowly. Flooding is more likely at Cedar Creek ‘middle’ and Cedar Creek ‘downstream’ than at Cedar Creek ‘upstream.’ This is due to the higher (relative to CONG001) connectivity between the channels of the lower reaches and their out-of-channel areas. Based on bed sediment characteristics, the heterogeneity of geomorphic channel units (GCUs) within each reach, and the abundance of large woody debris (LWD), in-stream habitat within each of the surveyed reaches on Cedar Creek (CONG001–003) was classified as ‘fair to good.’ Although, there is extensive evidence of animal activity...

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Charting Violent Extremism Research Priorities in North Africa and the Sahel 2018. RESOLVE Network, January 2021. http://dx.doi.org/10.37805/rp2021.1.lcb.

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As the socio-political dynamics of conflict and insecurity continue to evolve across North Africa and the Sahel, efforts to prioritize the exploration of ongoing and emerging violent extremist trends remain important. For decades, violent conflict, poor resource management, environmental change, and weak governments (through lack of institutional capacity or by predatory elite design) have contributed to cycles of instability and state fragility. Violent extremist organizations such as Boko Haram, al-Qaeda, and the self-proclaimed Islamic State and its affiliates have benefited from this instability. As the groups, tactics, and contexts continue to change, greater attention to ongoing and emerging threats to peace and stability in the region is needed. In 2018, the RESOLVE Network convened over 30 global, regional, and local researchers, practitioners and policymakers with varied expertise in local governance, development, and the preventing and countering violent extremism (P/CVE) research landscape in the Lake Chad Basin and regional proximity. The topics identified here reflect participants’ collective assessment of current dynamics, expertise, in-depth understanding, and commitment to continued analysis of violent extremism (VE) trends and dynamics in the region.

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