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.

Slope Stability Analysis Based on Strength Reduction Method FEM from the Perspective of Mechanics

2012 ◽  
Vol 424-425 ◽  
pp. 1187-1190
Author(s):  
Yue Zhai ◽  
Kun Long Yin
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Reduction Method ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Strength Reduction ◽  
Stability Factor ◽  
Strength Reduction Method ◽  
Equilibrium Method ◽  
Calculation Results

With the anti-shear parameters reduction, the nonlinear strength reduction FEM model of slope turns to unstable status and the numerical non-convergence occurs simultaneously. Hence, the safety stability factor obtained based on c-φ reduction algorithm can be regarded as equal to stability factor obtained using limit equilibrium method. In this paper, stability analysis of one reservoir slope is made and the calculation results show that the strength reduction method matches the traditional grid limit equilibrium method well, yet with much more available information. Efficient and accurate, the strength reduction FEM is feasible to examine slope stability and analyze slope movement patterns.

scholarly journals Study on Safety Coefficient and Failure Face Ratio of Slope with Soft Layer

2020 ◽  
Vol 198 ◽  
pp. 02027
Author(s):  
Ming-hui Gao ◽  
Jian-qing Zhao ◽  
Chao Sun ◽  
Xiao Wang ◽  
Qi-zhi Wang
Keyword(s):  
Reduction Method ◽  
Limit Equilibrium ◽  
Failure Surface ◽  
Limit Equilibrium Method ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Soft Layer ◽  
Safety Coefficient ◽  
Equilibrium Method ◽  
Weak Interlayer

In this paper, the slope with horizontal weak interlayer is taken as the research object, and the safety factor and the location of the failure surface of the slope are calculated by finite element strength reduction method and limit equilibrium method respectively. The results show that when the slope is mixed with soft layer, the positions of the critical failure surfaces calculated by the two methods are quite different, but their safety factors are relatively small. Which method is more accurate needs to be analyzed in combination with the specific conditions of the slope. Through comparative analysis, the calculation efficiency of limit equilibrium method is much higher than that of strength reduction method. The results of this paper provide reliable reference for engineering analysis.

Based on the Strength Reduction Slope Stability Finite Element Analysis of Engineering Examples

2012 ◽  
Vol 170-173 ◽  
pp. 885-888
Author(s):  
Peng Fei Li ◽  
Hong Bo Liu ◽  
Yu Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Slope Stability ◽  
Reduction Method ◽  
Limit Equilibrium ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Element Analysis ◽  
Finite Element Program ◽  
Element Program

The strength reduction method is applied in the analysis of slope stability, strength reduction, into the finite element program for calculating, until computations convergence. Combined with the engineering example, comparison of slope stability finite element method and the traditional limit equilibrium method the results show that, based on the strength reduction finite element analysis of slope stability is feasible.

Analysis of Unstable Rock-Mass Stability Based on Limit Equilibrium Method and Strength Reduction Method

2016 ◽  
Vol 858 ◽  
pp. 73-80
Author(s):  
Ying Kong ◽  
Hua Peng Shi ◽  
Hong Ming Yu
Keyword(s):  
Rock Mass ◽  
Failure Mode ◽  
Posterior Margin ◽  
Reduction Method ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Rock Masses ◽  
Unstable Rock

With the slope unstable rock masses of a stope in Longsi mine, Jiaozuo City, China as the target, we computed and analyzed the stability of unstable rock masses using a limit equilibrium method (LEM) and a discrete element strength reduction method (SRM). Results show that the unstable rock masses are currently stable. Under the external actions of natural weathering, rainfall and earthquake, unstable rock mass 1 was manifested as a shear slip failure mode, and its stability was controlled jointly by bedding-plane and posterior-margin steep inclined joints. In comparison, unstable rock mass 2 was manifested as a tensile-crack toppling failure mode, and its stability was controlled by the perforation of posterior-margin joints. From the results of the 2 methods we find the safety factor determined from SRM is larger, but not significantly, than that from LEM, and SRM can simulate the progressive failure process of unstable rock masses. SRM also provides information about forces and deformation (e.g. stress-strain, and displacement) and more efficiently visualizes the parts at the slope that are susceptible to instability, suggesting SRM can be used as a supplementation of LEM.

Analysis of Slope Instability Based on Strength Reduction Method

2012 ◽  
Vol 170-173 ◽  
pp. 1238-1242
Author(s):  
Xue Wei Li ◽  
Xin Yuan ◽  
Xiao Wei Li
Keyword(s):  
Plastic Zone ◽  
Reduction Method ◽  
Limit Equilibrium ◽  
Strength Reduction ◽  
Slope Instability ◽  
Strength Reduction Method ◽  
Numerical Convergence ◽  
Safety Coefficient ◽  
Reduction Coefficient ◽  
Slope Factor

Abstract. Combined the strength reduction method with ABAQUS, the development of the slope plastic strain of different reduction coefficient is obtained by constantly adjusting reduction coefficient to change the strength index of the soil. The reduction coefficient is obtained from the criterion of numerical convergence and displacement mutation and plastic zone breakthrough. Through the analysis and comparison with the results, the reduction coefficient by the criterion of displacement mutation is consistent with the result of the criterion of plastic zone breakthrough. The reduction coefficient is the safety coefficient of the slope, and compared and analyzed with the slope factor of limit equilibrium method Bishop. The result shows that the displacement mutation and the plastic zone breakthrough as criterions to judge the slope instability are reasonable.

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