The Numerical Simulation of Effect of Parameters for Bolts on Slope Stability

2013 ◽  
Vol 353-356 ◽  
pp. 84-88 ◽  
Author(s):  
Tao Li ◽  
Ling Zeng ◽  
Fang Guo
Keyword(s):  
Numerical Simulation ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Analysis Method ◽  
Standard Requirement ◽  
Stability Of Slope ◽  
The Stability ◽  
Bolt Spacing ◽  
Engineering Personnel

In order to analyze the influence of bolt supporting parameters on the stability of slope, based on the limit equilibrium method to establish model of slope and calculated the safety factor of slope. Research shows that: (1) As the bolt length increases, the safety factor of slope increases gradually, then the length of anchor bolt can be used as the design length when the safety factor can meet the standard requirement.(2) With the increase of the anchor Angle, the safety factor of slope present the trend of first increasing and then decreasing, when bolt spacing increased to a certain value, the safety factor of slope reduce significantly.(3)In this paper, the analysis method of slope bolting parameters on its effect to the stability is simple and strong operational, which can provide a reference for related engineering personnel.

Some Relationship between Safety Factor of Earthquake Slope and Related Parameters

2011 ◽  
Vol 422 ◽  
pp. 688-692
Author(s):  
Xiao Hei He ◽  
Geng You Han ◽  
Rui Hua Xiao
Keyword(s):  
Numerical Simulation ◽  
Rock Mechanics ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Static Method ◽  
Acceleration Coefficient ◽  
The Wenchuan Earthquake ◽  
Stability Of Slope ◽  
The Stability ◽  
The Relationship

Abstract:Since the Wenchuan earthquake happened, the slope stability had been paid much more attention. The safety factor is an important parameter that can be used to evaluate the stability of slope. The pseudo-static method that based on limit equilibrium and the method of numerical simulation can calculate the safety factor accurately, but the velocity that gets the result is slow. If we can establish the relationship between safety factor and some other parameters, then we can calculate the safety factor by using the relationship more quickly. This paper establishes much relationship, such as the relationship between the rock mechanics parameters and the average danymic safety factor, the relationship between the rock mechanics parameters and the ratio of average danymic safety factor to static safety factor, the relationship between the rock mechanics parameters and the average earthquake acceleration coefficient, the relationship between the average earthquake acceleration coefficient and the ratio of average danymic safety factor to static safety factor, and the relationship between the earthquake acceleration coefficient and the ratio of danymic safety factor to static safety factor on the condition of different rock mass.

Integral Anti-Slide Stability Analysis of RCC Gravity Dam

2013 ◽  
Vol 275-277 ◽  
pp. 1480-1483
Author(s):  
Li Zhang ◽  
Dan Pang ◽  
Jian Liu
Keyword(s):  
Stability Analysis ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Gravity Dam ◽  
Safety Factors ◽  
Standard Requirement ◽  
Load Combination ◽  
Dam Stability ◽  
The Stability

The main purpose of the gravity dam stability analysis is to examine the stability safety in all possible load combination cases. Combined with the engineering example, the method of modeling , loading and analysis for the gravity dam by ansys is introduced in this paper, then the limit equilibrium method and the strength reserve method are adopt to calculate the safety factor under two conditions. The results indicate that the two safety factors which are calculated under two conditions can all satisfy the standard requirement; it is reasonable to analyze the gravity dam stability through two methods.

Landslide Simulation Using Limit Equilibrium and Finite Element Method

2016 ◽  
Vol 857 ◽  
pp. 555-559 ◽  
Author(s):  
Zuhayr Md Ghazaly ◽  
Mustaqqim Abdul Rahim ◽  
Kok Alfred Chee Jee ◽  
Nur Fitriah Isa ◽  
Liyana Ahmad Sofri
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Factor Of Safety ◽  
Slip Surface ◽  
Limit Equilibrium ◽  
Main Concern ◽  
Analysis Method ◽  
Stability Of Slope ◽  
The Stability ◽  
Element Method

Slope stability analysis is one of the ancient tasks in the geotechnical engineering. There are two major methods; limit equilibrium method (LEM) and finite element method (FEM) that were used to analyze the factor of safety (FOS) to determine the stability of slope. The factor of safety will affect the remediation method to be underdesign or overdesign if the analysis method was not well chosen. This can lead to safety and costing problems which are the main concern. Furthermore, there were no statement that issued one of the analysis methods was more preferred than another. To achieve the objective of this research, the soil sample collected from landslide at Wang Kelian were tested to obtain the parameters of the soils. Then, those results were inserted into Plaxis and Slope/W software for modeling to obtain the factor of safety based on different cases such as geometry and homogenous of slope. The FOS obtained by FEM was generally lower compared to LEM but LEM can provide an obvious critical slip surface. This can be explained by their principles. Overall, the analysis method chosen must be based on the purpose of the analysis.

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 Numerical Simulation of Daping Landslide Group to Sunjiaya Tunnel

2012 ◽  
Vol 170-173 ◽  
pp. 413-417
Author(s):  
Wen She He ◽  
Long Yuan ◽  
Shuang Mei Chang
Keyword(s):  
Numerical Simulation ◽  
Limit Equilibrium ◽  
Simulation Method ◽  
Work Conditions ◽  
Sliding Surface ◽  
Tunnel Engineering ◽  
Safety Factors ◽  
Easy Method ◽  
Stability Of Slope ◽  
The Stability

The stability of two profile, with No.Ⅲ landslide of Daping landslide group near the tunnel engineering of Sunjiaya, was respectively discussed using limit equilibrium and numerical simulation method at operation one (gravity) and two (gravity+rainstorm) in this paper. The dangerous sliding surface and corresponding safety factors was calculated by limit equilibrium method, to upper and lower parts of No.Ⅲ landslide in two different work conditions. The model of two calculation profiles was established and the dangerous sliding surface and corresponding safety factors was simulated by finite difference software of FLAC3D for upper and lower parts of No.Ⅲ landslide at two operations. Compared with limit equilibrium, FLAC3D is a simple and easy method to analyze the stability of slope.

The Application of FLAC Software in Stability Analysis of Highway Slope Reinforced by Prestressed Anchor Cable

2012 ◽  
Vol 241-244 ◽  
pp. 2158-2162
Author(s):  
Hui Min Wang ◽  
Liang Cao ◽  
Ji Yao ◽  
Ze Li
Keyword(s):  
Numerical Simulation ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Stability Factor ◽  
Anchor Cable ◽  
Equilibrium Method ◽  
Before And After ◽  
Calculation Results ◽  
The Stability ◽  
Prestressed Anchor

rigid limit equilibrium method and numerical simulation of FLAC software based on strength reduction method was used in this paper, and the stability of a highway slope before and after the reinforcement by prestressed anchor cable was analyzed. The calculation results showed that, the stability of designed excavated slope could not meet the requirements, while the stability of reinforced sloped by prestressed anchor cable could. The sliding surface of the slope and the corresponding stability factor could be obtained in two ways, but the numerical simulation of FLAC software considered the material deformation, so the calculation results was smaller than the results of rigid limit equilibrium method.

Stability Analysis to the Imports Slope of the Spillway Tunnel of a Hydropower Station

2012 ◽  
Vol 594-597 ◽  
pp. 1936-1939
Author(s):  
Rui Hong Wang ◽  
Jun Lei Bai ◽  
Zhao Rong Jiang
Keyword(s):  
Stability Analysis ◽  
Limit Equilibrium ◽  
Stable State ◽  
Limit Equilibrium Method ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Equilibrium Calculation ◽  
Stability Of Slope ◽  
Spillway Tunnel ◽  
The Stability

Taking limit equilibrium calculation program SLIDE for the platform and establishing two-dimensional model of excavation slope. Based on unloading rock mass mechanics theory and method and considered the natural, excavation, reinforcement, water, rainfall, and other complex conditions to Study on the stability of slope during construction and operation, then using the outcome of the limit equilibrium method to give their assessment of slope stability. Analysis pointed out that : the high excavation slope basic in a stable state.

Safety Factor Calculation Method of Anchored Slope Based on Pseudo Cohesion Theory

2012 ◽  
Vol 170-173 ◽  
pp. 453-456
Author(s):  
Chong Shi ◽  
Yu Long Zhang ◽  
Qiang Zahng ◽  
Hai Li Wang ◽  
Sheng Nian Wang
Keyword(s):  
Stress State ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Stability Of Slope ◽  
Compatibility Principle ◽  
Cohesion Theory ◽  
The Stability ◽  
Concept Theory ◽  
Searching Method ◽  
Short Time

The stability of slope is closely related to stress-state. Assumptions about stress-state in the rigid body limit equilibrium method are not satisfied with the demands of deformation compatibility principle. So the stability analysis method compatible with slope stress and anchorage system should be established for anchored slope. The pseudo cohesion concept theory is used to analyze the improvement of stress-state due to anchoring measures, and the stability safety factor of anchored slope by sliding surfaces searching method is obtained, in which grid control is used and embedded in FLAC3D. The result shows that the safety factor with the pseudo cohesion theory is 1.43 while the strength reduction method is 1.41. The similar results for them show the validity of proposed method. What's more, the suggested method has an advantage of short time consuming.

Non-Linear Hoek-Brown Shear Strength Reduction Technique Considering the Effect of Dilation

2012 ◽  
Vol 446-449 ◽  
pp. 1524-1530
Author(s):  
Ting Ai ◽  
Ru Zhang ◽  
Li Ren ◽  
Wen Xi Fu
Keyword(s):  
Shear Strength ◽  
Factor Of Safety ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Strength Reduction ◽  
Equilibrium Method ◽  
Non Linear ◽  
Stability Of Slope ◽  
The Stability ◽  
Shear Strength Reduction

In order to implement the non-linear Hoek-Brown (HB) shear strength reduction (SSR) on commercially available softwares, this paper derives the relationship between the Drucker-prager (DP) criterion and HB criterion under the condition of plane strain. The equivalent DP parameters can be approximately estimated after serious transformations of parameters between the HB and Mohr-Coulomb (MC) yield functions. To assess the effect of dilation on the stability of slope, the non-associated flow rule, which cannot be contained in the existing limit equilibrium methods, is selected in our analysis, and the SSR-based results of a simple slope indicate that: If the angle of dilatancy ψ is taken to be zero, the factor of safety calculated by the SSR method is very close to that by the limit equilibrium method; if ψ is greater than zero, the factor of safety calculated by the SSR method is greater than that by the limit equilibrium method, and the effect of dilation on the stability of slope can be approximately described by a liner function.

Generalized Limit Equilibrium Method for Slope Stability Analysis

2012 ◽  
Vol 170-173 ◽  
pp. 557-568 ◽  
Author(s):  
Chuan Zhi Huang ◽  
Yong Hua Cao ◽  
Wan He Sun
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Limit Analysis ◽  
Limit Equilibrium ◽  
Soil Mass ◽  
Limit Equilibrium Method ◽  
Sliding Surface ◽  
Analysis Method ◽  
Equilibrium Method ◽  
Genuine Solution

On the basis of the limit equilibrium method and the physical significance of Coulomb’s yield criteria, extremum conditions of yield functions is established, which will be the fundamental equations for the limit analysis of soil mass. Once the stress equation along a sliding surface is available, the normal stress on the sliding surface can be obtained, a new limit analysis method, generalized limit equilibrium method (GLEM), can be established. With the generalized limit equilibrium method, an analysis method to solve the problem of slope stability can be obtained without introducing any other assumptions or simplified conditions but the sliding surface. With this algorithm, any discretionally possible sliding surface can be trial calculated and the least value of the calculated results of different sliding surfaces is taken as the safety factor. As long as a selected sliding surface is close to the true sliding surface, the derived safety factor will be approximate to the genuine solution to a problem of slope stability.

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