The Sensitivity and Reliability Analysis of Slope Stability Based on Strength Reduction FEM

2013 ◽  
Vol 353-356 ◽  
pp. 491-494
Author(s):  
Ying Xiang Wu ◽  
Qiang Liu ◽  
Yu Jun Cang
Keyword(s):  
Sensitivity Analysis ◽  
Slope Stability ◽  
Reliability Analysis ◽  
Safety Factor ◽  
Failure Probability ◽  
Failure Surface ◽  
Strength Reduction ◽  
New Method ◽  
Mechanical Parameters ◽  
Calculation Process

A new method for reliability and sensitivity analysis of slope stability is proposed in this paper, which is based on strength reduction FEM. In this proposed method, the safety factor of slope can be calculated without assuming the shape and position of failure surface beforehand, and the randomness of physical and mechanical parameters of slope are considered in the calculation process. Meanwhile, the slopes failure probability is researched when the coefficients of variability change, and some useful conclusions are achieved.

Non-Probabilistic Reliability Research on Slope Stability Based on Interval Analysis

2013 ◽  
Vol 838-841 ◽  
pp. 835-839
Author(s):  
Xiao Chun Lu ◽  
Liang Gan
Keyword(s):  
Slope Stability ◽  
Reliability Analysis ◽  
Uniform Distribution ◽  
Safety Factor ◽  
Failure Probability ◽  
Interval Analysis ◽  
Evaluation System ◽  
Safety Evaluation ◽  
Structural Performance ◽  
Performance Function

In this paper, slope stability considering non-probabilistic reliability analysis based on interval analysis was discussed. We can get safety factor, safety factor interval, non-probabilistic reliability by slope stability computation based on interval analysis. Based on the hypothesis that interval variable of structural performance function numerical value obeys uniform distribution, failure probability based on interval analysis was put forward. These form plural evaluation system about slope stability; it perfects safety evaluation for slope stability.

Numerical Study of Plastic Strains on Slope Instability

2012 ◽  
Vol 548 ◽  
pp. 363-366
Author(s):  
Mao Hu Wang ◽  
Zhen Liang Xu
Keyword(s):  
Finite Element ◽  
Slope Stability ◽  
Safety Factor ◽  
Numerical Study ◽  
Limit Equilibrium ◽  
Strength Reduction ◽  
Slope Instability ◽  
Open Pit ◽  
Instability Criterion ◽  
Incremental Search

This article simulates an open pit slope stability using the ANSYS software, which is based on the finite element strength reduction theory, three kinds of slope instability criterion of the strength reduction method are applied to judge whether the slope is on the limit equilibrium state, the incremental search method is used to search the safety factor of the slope stability, and the results show that, the slope body damages when the plastic zone developed from the top to the bottom, in the numerical simulation the finite element iteration calculation didn’t just converge, the corresponding former level of reduction factor is the safety factor, This article can have a guiding significance on the safety production of the open-pit mine.

Analysis of Three-Dimensional Excavation Slope Stability Subjected to In Situ Stress Based on Strength Reduction FEM

2011 ◽  
Vol 374-377 ◽  
pp. 2157-2162
Author(s):  
Jun Qi Wang
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Lateral Pressure ◽  
Pressure Coefficient ◽  
Three Dimensional ◽  
Horizontal Stress ◽  
Strength Reduction ◽  
Lateral Pressure Coefficient ◽  
Slope Direction

Slope usually lies in an initial stress field, especially in complex three-dimensional stress conditions. When horizontal stress is larger than vertical stress or the two horizontal stresses are not the same, the horizontal in-situ stress has significant effect on the excavation slope stability. To investigate the effects of the original in-situ stresses, the strength reduction method is used to analyze three-dimensional excavation slope, and Mohr-Coulomb yield rule is adopted, the failure criterion based on analysis convergence is suggested. First, the horizontal stress is uniform based on the gravity load, when lateral pressure coefficient increases, the safety factor decreases, and the plastic zones develop from slope to foot foundation. Then the condition of lateral pressure coefficient change is analyzed, slope direction pressure coefficient increases, plastic zone on the slope bottom increases, the safety factor decreases remarkably. Using the same method to analyze that of the lateral pressure coefficient on the slope face direction increases, the slope FS increases little holding the K2 unchanged with the K1 adding. The results show that the slope direction pressure coefficient has more effects on the safety coefficient than that of the axis.

System Reliability Analysis of Deep Sliding Stability of Gravity Dams

2011 ◽  
Vol 243-249 ◽  
pp. 5641-5649
Author(s):  
Sheng Hua Jiang ◽  
Jian Guo Hou ◽  
Ying Ming He
Keyword(s):  
Reliability Analysis ◽  
Failure Mode ◽  
Safety Factor ◽  
Linear Method ◽  
Reduction Factor ◽  
Strength Reduction ◽  
Safety Factors ◽  
Strength Reduction Factor ◽  
Gravity Dams ◽  
Sliding Stability

Various potential sliding paths and different failure modes should be considered in the stability of gravity dam against deep sliding when there are several faults. The safety factor of every fault is calculated with nonlinear finite element method, and the most possible sliding path is obtained by strength reduction method. The results indicate that the strength reduction factor is larger than the safety factors of all the faults. Based on the weighted regression response surface method, the reliability indices of the faults are computed and are compared with the safety factors, which shows there’s not an entire equity relationship between the reliability index and safety factor. Each failure mode of sliding path is a parallel system of several faults, and the final failure mode is the serial system composed of all sliding paths. The reliability of every sliding path and the final system are analyzed by means of the gradual equivalent linear method, and the results are consistent with the strength reduction factor. It’s recommended the reliability analysis be applied to the safety evaluation of deep sliding stability of gravity dams to make up the shortcomings of the safety factor method.

Effect of Nonlinear Shear Strength Characteristic on the Slope Stability of Super High Rockfill Dam

2007 ◽  
Vol 353-358 ◽  
pp. 2732-2735 ◽  
Author(s):  
Li Hong Chen ◽  
Jian Yang ◽  
You Ren Yuan ◽  
Tao Sun
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Safety Factor ◽  
Failure Surface ◽  
Safety Factors ◽  
Rockfill Dam ◽  
Potential Failure ◽  
Strength Models ◽  
Nonlinear Shear ◽  
High Rockfill Dam

Linear and nonlinear shear strength models of rockfill, and the safety factor criterion of nonlinear shear strength were discussed in this paper. The slope stability of 261.5 m high Nuozhadu rockfill dam was analyzed with three different shear strength models. The safety factors are almost equal and the positions of potential failure surface are similar. It is found that the allowable safety factor base on linear criterion in the existing code can be used without any change when applying nonlinear shear strength rules.

scholarly journals Slope Stability Analysis of “Vorobyovy Gory” Landslide in Moscow

2019 ◽  
Vol 11 (2) ◽  
pp. 90-94
Author(s):  
D. Tao ◽  
O.S. Barykina ◽  
K. Kang
Keyword(s):  
Sensitivity Analysis ◽  
Stability Analysis ◽  
Internal Friction ◽  
Slope Stability ◽  
Limit Equilibrium ◽  
Soil Layer ◽  
Friction Angle ◽  
Limit Equilibrium Method ◽  
Mechanical Parameters ◽  
Moscow River

 There are many engineering-geological problems in Moscow, including seepage deformation, karst and landslide. Among them, landslides develop along the Moscow River and its branches. This paper aims to analyze the slope stability of “Vorobyovy Gory” landslide with the help of the program GeoStudio. According to the limit equilibrium method, we can know the slope stability. In addition, we can know the internal friction angle among in the physical and mechanical parameters of soil layer has the greatest influences on its stability by sensitivity analysis. Finally, we can get the probability of damage by probabilistic analysis.

scholarly journals Stability analysis for two-layered slopes by using the strength reduction method

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sourav Sarkar ◽  
Manash Chakraborty
Keyword(s):  
Slope Stability ◽  
Reduction Method ◽  
Quantitative Estimation ◽  
Limit Equilibrium ◽  
Bottom Layer ◽  
Failure Surface ◽  
Strength Properties ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Failure Patterns

AbstractThe aim of this article is to present the slope stability charts for two layered soil slopes by using the strength reduction method (SRM). The primary focus is to provide a quantitative estimation of the improvement of slope stability when a stronger layer is placed over the weaker layer. The SRM carried in this work comprises a series of finite element lower bound (LB) and upper bound (UB) limit analysis in conjunction with nonlinear optimization. Unlike the limit equilibrium method (LEM), there is no need to consider any prior assumptions regarding the failure surface in SRM. The study is carried out for different combinations of (i) slope angles (β), (ii) strength properties of the top and the bottom layer (c, ϕ) and (iii) different thickness of the top layer. The failure patterns are shown for a few cases.

An Analysis of Slope Stability of Sand Embankment with Shear Strength Reduction (SSR) Method

2010 ◽  
Vol 152-153 ◽  
pp. 1017-1023 ◽  
Author(s):  
Shu Tang Liu ◽  
Wei Dong Cao ◽  
Ying Yong Li ◽  
Yong Shun Yang
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Reduction Method ◽  
Strength Reduction ◽  
Land Resource ◽  
Strength Reduction Method ◽  
Side Slope ◽  
Content Ratio ◽  
The Stability ◽  
Shear Strength Reduction

Comparing with conventional expressway embankment filled with clay only, the sand embankment tipped by intensely-weathered rock (IWR) can effectively reduce the consumption of cultivated land resource caused by the construction of expressway engineering. So it is significant to research the constructions of sand embankment tipped by IWR if local sand resources are enough. Combined with the construction of Qing-Lin freeway, in China, the slope stability of the embankment filled with sand and tipped by IWR outside was analyzed in the paper, and the analysis was conducted by the strength reduction method. The effects of the changes of compaction, water content, ratio of slope, height of the embankment and different IWR-width on the safety factor of the slope stability were investigated. The results indicate that, when the height of embankment is constant, the ratio of slope is the most important factor which influences the stability of side slope, and the IWR-width does not have a decisive effect on the safety factor on subsoil condition and it can be determined according to the convenience of site construction.

scholarly journals Análisis de Estabilidad Probabilístico del Talud de la Cantera Espinal – Juliaca

2018 ◽  
pp. 39-43
Keyword(s):  
Numerical Methods ◽  
Slope Stability ◽  
Safety Factor ◽  
Stress Reduction ◽  
Failure Probability ◽  
Probabilistic Analysis ◽  
Reduction Factor ◽  
Rock Slope Stability ◽  
Rocky Slope ◽  
Static Conditions

Análisis de Estabilidad Probabilístico del Talud de la Cantera Espinal – Juliaca Probabilistic Analysis of Slope Stability Espinal Quarry - Juliaca Fredy Alonso Valeriano Nina Facultad de Ingeniería de Minas, Universidad Nacional del Altiplano – Puno – Perú DOI: https://doi.org/10.33017/RevECIPeru2014.0006/ Resumen El presente estudio fue realizado en la cantera Espinal de la ciudad de Juliaca en el departamento de Puno, consiste en determinar los valores de seguridad que rigen la estabilidad o inestabilidad en un talud rocoso; factor de seguridad (FS) o reducción de la resistencia al corte (SRF) y la probabilidad de falla (PF), para lo cual se han utilizado los métodos generales de análisis de estabilidad de taludes en roca; Análisis cinemático y  métodos numéricos. Se realizó análisis probabilísticos por el método de estimación de puntos para mayor confiabilidad de los resultados de análisis con métodos numéricos. Teniendo como resultados en el análisis cinemático una probabilidad de plano de deslizamiento por volteo directo de 44.41%, los valores de seguridad promedio dado por los análisis probabilísticos con métodos numéricos en SRF son; para condiciones estáticas FS o SRF 2.27 y PF 0.0% y para condiciones seudoestáticas FS o SRF 1.21 y PF 2.98%. Por lo cual concluimos que el talud se encuentra estable en condiciones estáticas y seudoestáticas, tomando en consideración el resultado del análisis cinemático realizado se han observado grietas de tracción en la cresta del talud que fallaran por volteo directo dependiendo a la intensidad de los factores desencadenantes. Descriptores: Macizo rocosos, análisis probabilístico, factor de seguridad (FS), reducción de la resistencia al corte (SRF), probabilidad de falla (PF). Abstract This study was carried out in the Espinal highway of Juliaca city in the state of Puno, which consists in to determinate the safety values that controls the stability or instability of a rocky slope; safety factor (FS) or shear strength reduction (SRF) and failure probability (PF). Due to this, general methods of rock slope stability were used; cinematic analysis and numerical methods. Probabilistic analyses were conducted by the method of points’ estimation for more reliability in the results of numerical methods. Having in the cinematic analysis results a probability of glide plane by direct toppling of 44.41%, the values of average safety obtained by the probabilistic analysis with numerical methods in SFR are; for static conditions FS or SRF 2.27 and PF 0.0% and for pseudostatical conditions a FS or SRF 1.21 and PF 2.98%. Due to this, we concluded that the slope is stable in static and pseudostatic conditions, considering the results of cinematic analysis, were observed tension cracks on the top of the slope which failed by direct toppling depending of the intensity of trigger factors. Keywords: Rock Mass, probabilistic analysis, safety factor (FS), stress reduction factor (SRF), failure probability (PF).

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