Searching Sliding Surface of Homogeneous Soil Slope by Maxing Residual Sliding Force

2013 ◽  
Vol 353-356 ◽  
pp. 55-59
Author(s):  
Ming Wei Zou ◽  
Wei Jiang ◽  
Zhi Qi Lu
Keyword(s):  
Limit Equilibrium ◽  
Engineering Problem ◽  
New Method ◽  
Engineering Practice ◽  
Sliding Surface ◽  
Soil Slope ◽  
Equilibrium Equations ◽  
Homogeneous Soil ◽  
The Stability ◽  
Sliding Force

The stability of soil slope is a common engineering problem and many scholars and experts have done abundant works on it since 1940s. By utilizing limit equilibrium equations, some slice methods had been proposed to search the most dangerous sliding surface, and they obtain enormous success. This article focuses on the fact that residual sliding force is an important parameter to design resistant structures in Chinese engineering practice. While the most dangerous sliding surface does not coincide with the sliding surface which the largest residual sliding forces locates on. So we compile the program to find the sliding surface by maxing residual sliding force. And some sample examples are executed, the surfaces comes from new method are compared with surfaces form Janbu Method. Some interesting conclusions are obtained.

Application of Limit Equilibrium FEM Method to the Slope

2014 ◽  
Vol 926-930 ◽  
pp. 524-528
Author(s):  
Yan Zhai ◽  
Wei Ya Xu ◽  
Chong Shi ◽  
Sheng Nian Wang ◽  
Hai Long Zhang
Keyword(s):  
Safety Factor ◽  
Limit Equilibrium ◽  
Plastic State ◽  
Sliding Surface ◽  
Safety Factors ◽  
Fem Method ◽  
Stability Of Slope ◽  
The Difference ◽  
The Stability ◽  
Sliding Force

The limit equilibrium FEM method is a common method using the result of stresses fields obtained from numerical calculation to get resistant sliding force and driving sliding force on the dangerous sliding surface to analyze the stability of slope. The safety factor is the ratio of resistant sliding force to driving sliding force on the most dangerous sliding surface.When compares limit equilibrium FEM method with the rigid body limit equilibrium method, its applicability needs to be verified. Taking a project as an example, this work uses the two methods to analyze the stability of the slope. After calculating, two different safety factors on the sliding surface were got, and the reasons inducing the difference of the safety factors were analyzed. The result showed the safety factor calculated from the limit equilibrium FEM method is much closer to the real situation especially when some parts of the soil are in plastic state. It is mainly because the limit equilibrium FEM method takes the coordination of deformation into consideration. Then two conditions: nature and rain are calculated to analyzed the slope stability. It made a judgment of the stability of the slope and gave a beneficial conclusion to the project.

Reliability Analysis Based on Multi Sliding Surface Method

2013 ◽  
Vol 405-408 ◽  
pp. 576-579
Author(s):  
Yong Hua Cao ◽  
Chuan Zhi Huang
Keyword(s):  
Reliability Analysis ◽  
Safety Factor ◽  
Reliability Index ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Sliding Surface ◽  
Random Field Theory ◽  
Surface Method ◽  
Equilibrium Method ◽  
The Stability

The reliability theory based analysis is more advanced and reasonable compared with the traditional methods for slope stability analysis. Limit equilibrium method is usually used to evaluate the stability of a slope. In this paper, a new reliability analysis method is obtained based on JC method and multi sliding surface method which a new limit equilibrium method developed by Huang. Then, this new method is applied for a wharf slope. The sliding surface get from the safety factor is not the same as that from reliability index though they are close to each other. The safety factor or reliability index get from Fellenius method is smaller than that from other method. The safety factor or reliability index get from multi sliding surface method is close to that from Bishops method. The reliability index can be more reasonable after the standard deviation of the soil property index is deduced with random field theory.

Stability Analysis of Soil Slope and the Design of Anti-Slide Piles during Unsteady Seepage

2012 ◽  
Vol 204-208 ◽  
pp. 689-693
Author(s):  
Yong Quan Li ◽  
Hang Jing ◽  
Qing Huan Wang ◽  
Jun Fu Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Engineering Practice ◽  
Soil Slope ◽  
Safety Factors ◽  
Seepage Analysis ◽  
Slip Surfaces ◽  
Earth Pressures

Principle of calculation of water and earth pressures together by Limit Equilibrium Method (LEM) is introduced, and coupled deformation and seepage analysis is conducted by Finite Element Method (FEM ).The response of one soil slope is simulated during rapid drawdown of water level by LEM and FEM. The results calculated show that seepage upraises the critical slip surfaces, and critical slip surfaces and safety factors by two ways are pretty close. To assure the safety of the slope, the design of anti-slide piles is carried out. Those ways used may provide reference to engineering practice.

scholarly journals Failure Mechanism and Factor of Safety for Spatially Variable Undrained Soil Slope

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Liang Li ◽  
Xuesong Chu
Keyword(s):  
Random Field ◽  
Failure Mechanism ◽  
Factor Of Safety ◽  
Limit Equilibrium ◽  
Vertical Direction ◽  
Failure Surface ◽  
Cohesive Soil ◽  
Soil Slope ◽  
The Stability ◽  
Undrained Soil

This paper aims to investigate the differences in factor of safety (FS) and failure mechanism (FM) for spatially variable undrained soil slope between using finite element method (FEM) , finite difference method (FDM), and limit equilibrium method (LEM). The undrained shear strength of cohesive soil slope is modeled by a one-dimensional random field in the vertical direction. The FS and FM for a specific realization of random field are determined by SRT embedded in FEM- and FDM-based software (e.g., Phase2 6.0 and FLAC) and LEM, respectively. The comparative study has demonstrated that the bishop method (with circular failure surface) exhibits performance as fairly good as that of SRT both in FS and FM for the undrained slope cases where no preferable controlling surfaces such as hydraulic tension crack and inclined weak seams dominate the failure mechanism. It is, however, worthwhile to point out that unconservative FM is provided by the Bishop method from the aspect of failure consequence (i.e., the failure consequence indicated by the FM from the Bishop method is smaller than that from SRT). The rigorous LEM (e.g., M-P and Spencer method with noncircular failure surface) is not recommended in the stability analysis of spatially variable soil slopes before the local minima and failure to converge issues are fully addressed. The SRT in combination with FEM and/or FDM provides a rigorous and powerful tool and is highly preferable for slope reliability of spatially variable undrained slope.

A Further Study on Soil Slope Stability Analysis by Finite Element Slip Surface Stress Method

2012 ◽  
Vol 204-208 ◽  
pp. 492-501
Author(s):  
Hong Jun Li ◽  
Yan Yi Zhang ◽  
Zu Wen Yan
Keyword(s):  
Shear Strength ◽  
Equilibrium State ◽  
Surface Stress ◽  
Slip Surface ◽  
Limit Equilibrium ◽  
Strength Reduction ◽  
Engineering Practice ◽  
Limit Equilibrium State ◽  
Ultimate Limit ◽  
Sliding Force

In this paper, it proves that the necessary and sufficient condition for the potential sliding body reaching the ultimate limit equilibrium state is that the summation of shear stresses along the sliding surface equals to that of resistant shear strength. Based on the rigorous theory analyses and derivations, it is clearly shown that the definition of factor of safety (FOS) in the slip surface stress method (SSSM) is irrelevant with the shape of slip surface. Thus, the authors demonstrate that the FOS of noncircular slip surface can also be defined as the ratio of the sum of resistant sliding force along slip surface to that of sliding force. Furthermore, the physical meaning of the FOS in the SSSM, which can be taken as the average evaluation of the strength reduction coefficient that makes the sliding body reach the ultimate limit equilibrium state along the slip surface in nature, is formulated on the basis of strength reserving theory rather than the overloading theory like that in the Limit Equilibrium Method (LEM) and the Shear Strength Reduction Method (SSRM). Finally, the factors of safety (FOS) and the locations of critical failure surfaces obtained by the SSSM, LEM and SSRM are compared for various geotechnical practices. It is found that the SSSM can achieve precise and reasonable stability assessments for the soil slopes on the basis of actual stress field. Consequently, compared with the LEM and SSRM, the SSSM is demonstrated to be effective and efficient alternative approach for routine analysis and design in geotechnical engineering practice with a high level of confidence.

The Stability Analysis on Reservoir Bank Slope of Granite Stained Subgrade

2011 ◽  
Vol 250-253 ◽  
pp. 1711-1716
Author(s):  
Li Chao Wang ◽  
Ping Gen Zhou
Keyword(s):  
Stability Analysis ◽  
Rigid Body ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Dynamic Compaction ◽  
Sliding Surface ◽  
Bank Slope ◽  
The Stability ◽  
Safety Operation ◽  
Reservoir Bank Slope

The limit equilibrium method for rigid body is used to analyze the stability of subgrade reservoir bank slope of granite stained. The sliding of subgrade reservoir bank slope reinforced by dynamic compaction along the interface will not be happened. In the most unfavorable conditions , the sliding surface will be formed inside the stained subgrade, which threatened to the safety operation of the expressway.

Numerical Simulation of Failure Process on Soil Slope with Different Support Measures

2014 ◽  
Vol 580-583 ◽  
pp. 665-668
Author(s):  
Yu Wei Zhang ◽  
Lie Xian Tang ◽  
Da Chuan Bai ◽  
Peng Zhou
Keyword(s):  
Failure Process ◽  
Sliding Surface ◽  
Soil Slope ◽  
Safety Factors ◽  
Slide Mass ◽  
Support Measures ◽  
Conventional Analysis ◽  
Stability Of Slope ◽  
Failure Point ◽  
The Stability

In conventional analysis methods of soil slope, we must presume potential sliding surface at first and then gain the safety factors, judge the stability of slope by the safety factors. In fact, if we know a slope is unstability but don’t know where will be slide or failure, we can’t adopt effective measures to support and prevent the sliding accidents appearing. This paper use RFPA-Centrifuge to numerical simulate the failure of soil slope with different support measures without presume any potential sliding surface, success to gain the failure process and the corresponding safety factors. From the calculate results of RFPA-Centrifuge, we can find where is the first failure point and all the slide mass. So if we can use good analysis software to simulate the failure process of slope and adopt corresponding support measures before the engineering beginning, the stability of slope will be better and the accidents will be disappeared or reduced.

Study on Slope Surface Shape of Homogeneous Soil Slope

2012 ◽  
Vol 170-173 ◽  
pp. 1158-1161
Author(s):  
Sen Wen ◽  
Li Min Zhao ◽  
Yu Qing Yuan
Keyword(s):  
Vertical Wall ◽  
Surface Shape ◽  
Practical Significance ◽  
Soil Slope ◽  
Slope Surface ◽  
Gradient Slope ◽  
Knee Point ◽  
Stability Of Slope ◽  
Homogeneous Soil ◽  
The Stability

The research on slope is concentrated on stability analysis at present. Although there is little research on slope surface shape, it has important theoretical and practical significance. Based on guaranteeing the same earthwork, the shape of slope surfaces between single gradient slope surface and two-gradient slope surface whose lower part is steeper than upper part are compared. It’s concluded that (1) based on guaranteeing the same earthwork, two-gradient slope surface, whose lower part is steeper than upper part, is stabler than single gradient slope surface and when the lower part is vertical wall, the slope is stablest; (2) the height of vertical wall has a knee point, i.e. when more than this value ,the stability of slope decreases.

scholarly journals A Simple Model for Simulating Infiltration in Two-Layer Soil Slope during Unsteady Rainfall and its Application in Slope Stability Analysis

2021 ◽  
Author(s):  
Shaohong Li ◽  
Shixin Zhang ◽  
Guoguo Liu ◽  
Shuairun Zhu
Keyword(s):  
Failure Probability ◽  
Limit Equilibrium ◽  
Infiltration Rate ◽  
Field Method ◽  
Probabilistic Methods ◽  
Water Infiltration ◽  
Soil Slope ◽  
Infiltration Capacity ◽  
Proposed Model ◽  
The Stability

Abstract Based on the Darcy's law and water balanceprinciple,some infiltration models have been proposed,but most of these models are not suitable for simulating infiltration into layered soils during unsteady rainfall. In this paper, a simple modelfor simulating water infiltration into the two-layer soil slopesduring unsteadyrainfallwasproposed, combined with the limit equilibrium methodto analyze the stability of thetwo-layer soil slope.The water infiltration rate of slopes depends on rainfall intensity and the actual infiltration capacity of soils. The proposedmodelhas been successfully applied to three cases (steady rainfall and homogeneous slope, unsteady rainfall and homogeneous slope,unsteady rainfall and two-layer soil slope), and it can be also combined with probabilistic methods to calculate the failure probability of slopes.Compared with the Richards model, the combination of the proposed model and the random field method can quickly obtain the failure probability of the slope.

Environmental Safety Analysis for Slope under the Situation with and without Load on Top Surface

2011 ◽  
Vol 356-360 ◽  
pp. 2114-2117
Author(s):  
Ke Ping Chen ◽  
Jin Yuan Liu ◽  
Bing Xiang Yuan
Keyword(s):  
Numerical Model ◽  
Environmental Safety ◽  
Soil Slope ◽  
Safety Factors ◽  
Strain Mode ◽  
Dilation Angle ◽  
Slip Planes ◽  
Stability Of Slope ◽  
Homogeneous Soil ◽  
The Stability

In order to study the effect of dilation angle ψ to the stability of slope, a numerical model was founded in plane strain mode by FLAC3D for homogeneous soil slope. The safety factors and slip planes were obtained for different dilation angles, and the relationships of dilation angle, safety factor and slip plane were analyzed for different situations with and without load on the top surface.

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