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slope stability hazard management systems

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第11期8卷 1695-1711页

作者： FREDLUND Delwyn G. Department of Civil Engineering University of Saskatchewan Saskatoon SK Canada MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University Hangzhou 310027 China

Weather-related geo-hazards are a major concern for both natural slopes and man-made slopes and embankments. Government agencies and private companies are increasingly required to ensure that there is adequate protection of sloping sur- faces in order that interaction with the climate does not produce instability. Superior theoretical formulations and computer tools are now available to address engineering design issues related to the near ground surface soil-atmospheric interactions. An ex- ample is given in this paper that illustrates the consequences of not paying adequate attention to the hazards of slope stability prior to the construction of a highway in South America. On the other hand, examples are given from Hong Kong and China's Mainland where significant benefits are derived from putting in place a hazard slope stability management system. Some results from a hazard management slope stability study related to the railway system in Canada are also reported. The study took advantage of recent research on unsaturated soil behaviour and applied this information to real-time modelling of climatic conditions. The quantification of the water balance at the ground surface, and subsequent infiltration, is used as the primary tool for hazard level assessment. The suggested hazard model can be applied at either specific high risk locations or in a more general, broad-based manner over large areas. A more thorough understanding of unsaturated soil behaviour as it applies to near ground surface soils, along with the numerical computational power of the computer has made it possible for new approaches to be used in slope hazard management engineering.

关键词： slope stability Geo-hazards Highway Hazard slope stability management system

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slope stability analysis based on big data and convolutional neural network

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Frontiers of Structural and Civil Engineering 2022年第7期16卷 882-895页

作者： Yangpan FU Mansheng LIN You ZHANG Gongfa CHEN Yongjian LIU School of Civil and Transportation Engineering Guangdong University of TechnologyGuangzhou 510006China

The Limit Equilibrium Method(LEM)is commonly used in traditional slope stability analyses,but it is time-consuming and *** to its complexity and nonlinearity involved in the evaluation process,it cannot provide a quick stability estimation when facing a large number of *** this case,the convolutional neural network(CNN)provides a better alternative.A CNN model can process data quickly and complete a large amount of data analysis in a specific situation,while it needs a large number of training *** is difficult to get enough slope data samples in practical *** study proposes a slope database generation method based on the *** were amplified from 40 typical slopes,and a sample database consisting of 20000 slope samples was *** sample database for slopes covered a wide range of slope geometries and soil layers’physical and mechanical *** CNN trained with this sample database was then applied to the stability prediction of 15 real slopes to test the accuracy of the CNN *** results show that the slope stability prediction method based on the CNN does not need complex calculation but only needs to provide the slope coordinate information and physical and mechanical parameters of the soil layers,and it can quickly obtain the safety factor and stability state of the ***,the prediction accuracy of the CNN trained by the sample database for slope stability analysis reaches more than 99%,and the comparisons with the BP neural network show that the CNN has significant superiority in slope stability ***,the CNN can predict the safety factor of real *** particular,the combination of typical actual slopes and generated slope data provides enough training and testing samples for the CNN,which improves the prediction speed and practicability of the CNN-based evaluation method in engineering practice.

关键词： slope stability limit equilibrium method convolutional neural network database for slopes big data

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slope stability Analysis Based on Group Decision Theory and Fuzzy Comprehensive Evaluation

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Journal of Earth Science 2020年第6期31卷 1121-1132页

作者： Peng Xia Xinli Hu Shuangshuang Wu Chunye Ying Chang Liu Faculty of Engineering China University of GeosciencesWuhan 430074China

A slope stability evaluation method is proposed combining group decision theory,the analytic hierarchy process and fuzzy comprehensive *** index weight assignment of each evaluation element is determined by group decision theory and the analytic hierarchy process,and the membership degree of each indicator is determined based on fuzzy set *** to the weights and memberships,the membership degrees of the criterion layer are obtained by fuzzy operations to evaluate the slope *** results show that(1)the evaluation method comprehensively combines the effects of multiple factors on the slope stability,and the evaluation results are accurate;(2)the evaluation method can fully leverage the experience of the expert group and effectively avoid evaluation errors caused by the subjective bias of a single expert;(3)based on a group decision theory entropy model,this evaluation method can quantitatively evaluate the reliability of expert decisions and effectively improve the efficiency of expert group discussion;and(4)the evaluation method can transform the originally fuzzy and subjective slope stability evaluation into a quantitative evaluation.

关键词： group decision theory analytic hierarchy process fuzzy comprehensive evaluation slope stability

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slope stability assessment of an open pit using lattice-spring-based synthetic rock mass (LS-SRM) modeling approach

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 927-942页

作者： Subash Bastola Ming Cai Branko Damjanac MIRARCO Laurentian UniversitySudburyCanada Bharti School of Engineering Laurentian UniversitySudburyCanada Key Laboratory of Ministry of Education for Safe Mining of Deep Metal Mines Northeastern UniversityShenyangChina Itasca Consulting Group Inc.MinneapolisMNUSA

Discontinuity waviness is one of the most important properties that influence shear strength of jointed rock masses,and it should be incorporated into numerical models for slope stability ***,in most existing numerical modeling tools,discontinuities are often simplified into planar *** fracture network modeling tools such as MoFrac allow the simulation of non-planar discontinuities which can be incorporated into lattice-spring-based geomechanical software such as slope Model for slope stability *** this study,the slope failure of the south wall at Cadia Hill open pit mine is simulated using the lattice-spring-based synthetic rock mass(LS-SRM)modeling ***,the slope model is calibrated using field displacement monitoring data,and then the influence of different discontinuity configurations on the stability of the slope is *** modeling results show that the slope with non-planar discontinuities is comparatively more stable than the ones with planar *** addition,the slope becomes increasingly unstable with the increases of discontinuity intensity and *** greater pit depth with higher in situ stress,both the slope models with planar and non-planar discontinuities experience localized failures due to very high stress concentrations,and the slope model with planar discontinuities is more deformable and less stable than that with non-planar discontinuities.

关键词： Lattice-spring-based synthetic rock mass (LS-SRM)modeling Non-planar discontinuities slope stability slope model Discrete fracture network(DFN)modeling

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slope stability prediction using ensemble learning techniques: A case study in Yunyang County, Chongqing, China

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1089-1099页

作者： Wengang Zhang Hongrui Li Liang Han Longlong Chen Lin Wang School of Civil Engineering Chongqing UniversityChongqing400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing400045China

slope stability prediction plays a significant role in landslide disaster prevention and *** study develops an ensemble learning-based method to predict the slope stability by introducing the random forest(RF)and extreme gradient boosting(XGBoost).As an illustration,the proposed approach is applied to the stability prediction of 786 landslide cases in Yunyang County,Chongqing,*** comparison,the predictive performance of RF,XGBoost,support vector machine(SVM),and logistic regression(LR)is systematically investigated based on the well-established confusion matrix,which contains the known indices of recall rate,precision,and ***,the feature importance of the 12 influencing variables is also *** show that the accuracy of the XGBoost and RF for both the training and testing data is superior to that of SVM and LR,revealing the superiority of the ensemble learning models(*** and RF)in the slope stability prediction of Yunyang *** the 12 influencing factors,the profile shape is the most important *** proposed ensemble learning-based method offers a promising way to rationally capture the slope *** can be extended to the prediction of slope stability of other landslide-prone areas of interest.

关键词： Machine learning slope stability Yunyang county Extreme gradient boosting(XGBoost) Random forest(RF)

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Effects of vertical seismic acceleration on 3D slope stability

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 487-494页

作者： Zhang Fei Gao Yufeng Wu Yongxin Zhang Ning Qiu Yue Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University

The conventional pseudo-static approach often neglects the effect of the vertical＇ seismic acceleration on the stability of a slope, but some analyses under plane-strain （2D） conditions show a significant effect on the slope stability. The purpose of this study is to investigate the effect of the vertical acceleration on the safety of three-dimensional （3D） slopes. In the strict framework of limit analysis, a 3D kinematically admissible rotational failure mechanism is adopted here for 3D homogeneous slopes in frictional/cohesive soils. A set of stability charts is presented in a wide range of parameters for 3D slopes under combined horizontal and vertical seismic loading conditions. Accounting for the effects of the vertical seismic acceleration, the difference in safety factors for 3D slopes can exceed 10%, which will significantly overestimate the safety of the 3D slopes.

关键词： slope stability seismic effects limit states three-dimensional analysis vertical acceleration

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Rapid and robust slope failure appraisal using aerial photogrammetry and 3D slope stability models

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International Journal of Mining Science and Technology 2020年第5期30卷 651-658页

作者： Neil Bar Michael Kostadinovski Michael Tucker Glen Byng Rully Rachmatullah Arturo Maldonado Markus Pötsch Andreas Gaich Alison McQuillan Thamer Yacoub BHP PerthWA 6000Australia 3GSM GmbH 8010 GrazStyriaAustria Rocscience Inc. Toronto M5T 1V1Canada

slope failures are an inevitable aspect of economic pit slope designs in the mining *** open pit guidelines and industry standards accept up to 30%of benches in open pits to collapse provided that they are controlled and that no personnel are at *** ground control measures including real time monitoring systems at TARP(trigger-action-response-plan)protocols are widely utilized to prevent personnel from being exposed to slope failure *** and computing capability are rapidly *** photogrammetry techniques using UAV(unmanned aerial vehicle)enable geotechnical engineers and engineering geologists to work faster and more safely by removing themselves from potential line-of-fire near unstable *** stability modelling software using limit equilibrium(LE)and finite element(FE)methods in three dimensions(3D)is also becoming more accessible,user-friendly and faster to *** key components enable geotechnical engineers to undertake site investigations,develop geotechnical models and assess slope stability faster and in more detail with less exposure to fall of ground hazards in the *** paper describes the rapid and robust process utilized at BHP Limited for appraising a slope failure at an iron ore mine site in the Pilbara region of Western Australia using a combination of UAV photogrammetry and 3D slope stability models in less than a shift(*** than 12 h).

关键词： slope stability 3D limit equilibrium analysis Aerial imagery Photogrammetry Open pit mining

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Limit equilibrium analysis for rock slope stability using basic Hoek–Brown strength criterion

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Journal of Central South University 2017年第9期24卷 2154-2163页

作者：邓东平赵炼恒李亮 School of Civil Engineering Central South UniversityChangsha 410075China

Hoek–Brown(HB)strength criterion can reflect rock’s inherent failure nature,so it is more suitable for analyzing the stability of rock ***,the traditional limit equilibrium methods are at present only suitable for analyzing the rock slope stability using the linear equivalent Mohr–Coulomb(EMC)strength parameters instead of the nonlinear HB strength ***,a new method derived to analyze directly the rock slope stability using the nonlinear HB strength criterion for arbitrary curve slip surface was described in the limit equilibrium *** current method was established based on certain assumptions concerning the stresses on the slip surface through amending the initial normal stressσ0 obtained without considering the effect of inter-slice forces,and it can satisfy all static equilibrium conditions of the sliding body,so the current method can obtain the reasonable and strict factor of safety(FOS)*** with the results of other methods in some examples,the feasibility of the current method was ***,the parametric analysis shows that the slope angleβhas an important influence on the difference of the results obtained using the nonlinear HB strength criterion and its linear EMC strength ***β≤45°,both of the results are similar,showing the traditional limit equilibrium methods using the linear EMC strength parameters and the current method are all suitable to analyze rock slope stability,but forβ>60°,the differences of both the results are obvious,showing the actual slope stability state can not be reflected in the traditional limit equilibrium methods,and then the current method should be used.

关键词： Hoek-Brown strength criterion linear equivalent Mohr-Coulomb strength parameters slope stability limit equilibrium slip surface factor of safety

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Application of artificial neural network for calculating anisotropic friction angle of sands and effect on slope stability

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Journal of Central South University 2015年第5期22卷 1878-1891页

作者： Hamed Farshbaf Aghajani Hossein Salehzadeh Habib Shahnazari School of Civil Engineering Iran University of Science and Technology

The anisotropy effect is one of the most prominent phenomena in soil mechanics. Although many experimental programs have investigated anisotropy in sand, a computational procedure for determining anisotropy is lacking. Thus, this work aims to develop a procedure for connecting the sand friction angle and the loading orientation. All principal stress rotation tests in the literatures were processed via an artificial neural network. Then, with sensitivity analysis, the effect of intrinsic soil properties,consolidation history, and test sample characteristics on enhancing anisotropy was examined. The results imply that decreasing the grain size of the soil increases the effect of anisotropy on soil shear strength. In addition, increasing the angularity of grains increases the anisotropy effect in the sample. The stability of a sandy slope was also examined by considering the anisotropy in shear strength parameters. If the anisotropy effect is neglected, slope safety is overestimated by 5%-25%. This deviation is more apparent in flatter slopes than in steeper ones. However, the critical slip surface in the most slopes is the same in isotropic and anisotropic conditions.

关键词： anisotropy artificial neural network sand principal stress rotation slope stability

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Finite element reliability analysis of slope stability

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第5期10卷 645-652页

作者： Xiao-hui TAN Jian-guo WANG School of Resource and Environmental Engineering Hefei University of Technology Hefei 230009 China School of Civil Engineering Hefei University of Teehnology Hefei 230009 China

The method of nonlinear finite element reliability analysis (FERA) of slope stability using the technique of slip surface stress analysis (SSA) is studied. The limit state function that can consider the direction of slip surface is given, and the formula-tions of FERA based on incremental tangent stiffness method and modified Aitken accelerating algorithm are developed. The limited step length iteration method (LSLIM) is adopted to calculate the reliability index. The nonlinear FERA code using the SSA technique is developed and the main flow chart is illustrated. Numerical examples are used to demonstrate the efficiency and robustness of this method. It is found that the accelerating convergence algorithm proposed in this study proves to be very efficient for it can reduce the iteration number greatly, and LSLIM is also efficient for it can assure the convergence of the iteration of the reliability index.

关键词： slope stability Finite element method Reliability analysis Limited step length iteration method (LSLIM) Accelerating convergence

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