scholarly journals Slip Line Theory Based Stability Analysis on the Influence of Deep Excavation on Adjacent Slope

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Aizhao Zhou ◽  
Chengchao Li ◽  
Pengming Jiang ◽  
Kai Yao ◽  
Na Li ◽  
...  
Keyword(s):  
Slip Line ◽  
Factor Of Safety ◽  
Slip Surface ◽  
Flow Rule ◽  
Deep Excavation ◽  
Critical Slip Surface ◽  
Line Field ◽  
Displacement Constraint ◽  
Line Theory ◽  
The Impact

The impact of deep excavation to the stability of adjacent slope is evaluated based on the slip line theory. Stress field of slope under various excavation conditions is simulated by finite element method, while slip line field is determined by non-associated flow rule. Factor of safety is obtained by integrating the skid-resistance and the shear stress on each slip line, and the slip line with minimum factor of safety corresponds to the critical slip surface. Two typical displacement constraint boundaries are considered. The results indicate that the critical slip surface moves towards to the slope surface and develops downwards. The factor of safety decreases with the excavation process. For flexible displacement constraint boundary, large deformation of supporting pile causes obvious variation of critical slip surface and factor of safety. In terms of the stiff displacement constraint boundary with internal supports, deep excavation only has limited effect on the slope stability.

scholarly journals A Slip-Line Field Analysis of the Deformation at the Confluence of two Glacier Streams

1970 ◽  
Vol 9 (56) ◽  
pp. 169-193 ◽  
Author(s):  
I. F. Collins
Keyword(s):  
Slip Line ◽  
Plastic Material ◽  
Yukon Territory ◽  
Field Analysis ◽  
Main Stream ◽  
Line Field ◽  
Perfectly Plastic ◽  
Line Theory ◽  
Intense Shear ◽  
The Ideal

The deformation and state of stress at the confluence of two glacier streams are analysed using the techniques of slip-line theory. The valley walls are taken to be vertical parallel planes and the deformation is supposed independent of depth. The mechanical behavior of ice is modeled by the ideal rigid/perfectly plastic material.Detailed solutions are presented for the deformation at the confluence of one or more tributaries with a main stream and of two main streams. Attention is concentrated on predicting the number, position and magnitude of the bands of intense shear which emanate from some of the junction corners. The predictions of this idealized theory are compared with field data from a confluence on the Kaskawulsh Glacier, Yukon Territory, Canada.

scholarly journals A Genetic Algorithm for Locating the Multiscale Critical Slip Surface in Jointed Rock Mass Slopes

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Qiang Xu ◽  
Jian-yun Chen ◽  
Jing Li ◽  
Hong-yuan Yue
Keyword(s):  
Genetic Algorithm ◽  
Rock Mass ◽  
Stress Field ◽  
Factor Of Safety ◽  
Optimization Problems ◽  
Slip Surface ◽  
Fitness Function ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Critical Slip Surface

The joints have great influence on the strength of jointed rock mass and lead to the multiscale, nonhomogeneous, and anisotropic characteristics. In order to consider these effects, a new model based on a genetic algorithm is proposed for locating the critical slip surface (CSS) in jointed rock mass slope (JRMS) from its stress field. A finite element method (FEM) was employed to analyze the stress field. A method of calculating the mechanical persistence ratio (MPR) was used. The calculated multiscale and anisotropic characteristics of the MPR were used in the fitness function of genetic algorithm (GA) to calculate the factor of safety. The GA was used to solve optimization problems of JRMS stability. Some numerical examples were given. The results show that the multiscale and anisotropic characteristics of the MPR played an important role in locating the CSS in JRMS. The proposed model calculated the CSS and the factor of safety of the slope with satisfactory precision.

Simplified Bishop Method Homogeneous Soil Slope Stability Analysis Based on the C# Language

2014 ◽  
Vol 580-583 ◽  
pp. 291-295
Author(s):  
Hai Bing Wei ◽  
Qian Zhang ◽  
Jun Hai Zhao
Keyword(s):  
Factor Of Safety ◽  
Slip Surface ◽  
Soil Slope ◽  
Critical Slip Surface ◽  
C Language ◽  
User Input ◽  
Fast Speed ◽  
Basic Parameters ◽  
Homogeneous Soil ◽  
Good Visibility

A computer program was compiled based on the C# language of Microsoft Visual Studio 2008 and the principle of simplified Bishop method. The program will calculate the minimum factor of safety, and automatically draw the two-dimensional (2-D) critical slip surface after user input the basic parameters. Through testing a lot of examples, the program has good stability, high precision, fast speed and good visibility.

scholarly journals Characterization of slip lines in single edge notched tension specimens

2015 ◽  
Vol 6 (3) ◽  
pp. 7 ◽  
Author(s):  
Filip Van Gerven ◽  
Wim De Waele ◽  
Diego Belato Rosado ◽  
Stijn Hertelé
Keyword(s):  
Slip Line ◽  
Base Material ◽  
Heterogeneous Structure ◽  
Single Edge ◽  
Element Analysis ◽  
Weld Failure ◽  
Failure Assessment ◽  
Line Theory ◽  
Line Patterns ◽  
The Impact

The application of slip line analysis in weld failure assessment has not gained much attention to date. The presented research aims to predict slip line patterns taking into account the complex heterogeneous structure of the weld. A preliminary study based on Single Edge Notched Tension (SENT) test results sampling pure base material, i.e. not containing any welds is conducted to assess the impact of side grooves on slip line behaviour and to validate slip line theory and finite element analysis.

Genetic algorithm search for critical slip surface in multiple-wedge stability analysis

1999 ◽  
Vol 36 (2) ◽  
pp. 382-391 ◽  
Author(s):  
Anthony TC Goh
Keyword(s):  
Genetic Algorithm ◽  
Stability Analysis ◽  
Slope Stability ◽  
Factor Of Safety ◽  
Search Strategy ◽  
Slip Surface ◽  
Pattern Search ◽  
Optimization Techniques ◽  
Thin Layers ◽  
Critical Slip Surface

Most procedures for determining the critical slip surface in slope-stability analysis rely on traditional nonlinear optimization techniques. The main shortcoming of these techniques is the uncertainty as to robustness of the algorithms to locate the global minimum factor of safety rather than the local minimum factor of safety for complicated and nonhomogeneous geological subsoil conditions. This paper describes the incorporation of a genetic algorithm methodology for determining the critical slip surface in multiple-wedge stability analysis. This search strategy is becoming increasingly popular in engineering optimization problems because it has been shown in a wide variety of problems to be suitably robust for the search not to become trapped in local optima. Three examples are presented to demonstrate the effectiveness of the genetic algorithm approach. The search strategy was found to be sufficiently robust to handle layered soils with weak, thin layers, and as efficient and accurate as the conventional pattern search method.Key words: critical slip surface, factor of safety, genetic algorithms, optimization, slope stability, wedge analysis.

An efficient search method for finding the critical circular slip surface using the Monte Carlo technique

2001 ◽  
Vol 38 (5) ◽  
pp. 1081-1089 ◽  
Author(s):  
AI Husein Malkawi ◽  
W F Hassan ◽  
S K Sarma
Keyword(s):  
Monte Carlo ◽  
Stability Analysis ◽  
Slope Stability ◽  
Factor Of Safety ◽  
Global Minimum ◽  
Reliable Method ◽  
Slip Surface ◽  
Search Method ◽  
Monte Carlo Technique ◽  
Critical Slip Surface

Locating the critical slip surface and the associated minimum factor of safety are two complementary parts in a slope stability analysis. A large number of computer programs exist to solve slope stability problems. Most of these programs, however, have used inefficient and unreliable search procedures to locate the global minimum factor of safety. This paper presents an efficient and reliable method to determine the global minimum factor of safety coupled with a modified version of the Monte Carlo technique. Examples are presented to illustrate the reliability of the proposed method.Key words: factor of safety, method of search, critical slip surface, circular, global, Monte Carlo.

scholarly journals Rigorous Solution of Slopes’ Stability considering Hydrostatic Pressure

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Chengchao Li ◽  
Pengming Jiang ◽  
Aizhao Zhou
Keyword(s):  
Hydrostatic Pressure ◽  
Slip Line ◽  
Slip Surface ◽  
Limit State ◽  
Soil Parameters ◽  
Rigorous Solution ◽  
Line Field ◽  
Discontinuity Line ◽  
Slip Line Field ◽  
Sliding Mechanism

According to characteristics of soils in failure, a sliding mechanism of slopes in limit state is divided into five parts, for building a slip line field satisfying all possible boundary conditions. An algorithm is built to obtain the rigorous solution approaching upper and lower bound values simultaneously, which satisfies the static boundary and the kinematical boundary based on the slip line field, while stress discontinuity line and velocity discontinuity line are key points. This algorithm is copared with the Spencer method to prove its feasibility with a special example. The variation of rigorous solution, including an ultimate load and a sliding belt the rigid body sliding along rather than a single slip surface for friction-type soils, is achieved considering hydrostatic pressure with soil parameters changing.

Search for critical slip surfaces based on finite element method

1995 ◽  
Vol 32 (2) ◽  
pp. 233-246 ◽  
Author(s):  
Jin-Zhang Zou ◽  
David J. Williams ◽  
Wen-Lin Xiong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Programming ◽  
Factor Of Safety ◽  
Slip Surface ◽  
Limit Equilibrium ◽  
Dynamic Programming Method ◽  
Critical Slip Surface ◽  
Slip Surfaces ◽  
Element Method

In this paper, finite element methods (FEM) are used to determine local shear strength mobilization ratios within a slope and to indicate the probable location of the critical slip surface. To locate the critical slip surface and hence determine the minimum factor of safety, an improved dynamic programming method (IDPM) is employed, in which possible slip surfaces, which must pass between state points, may pass both between and along stages. The IDPM is coupled with an expression for the factor of safety for which the stresses are obtained from the FEM. The results obtained using the FEM–IDPM, for a homogeneous slope and for a test embankment on soft Bangkok clay, have been compared with those observed and obtained using the traditional finite element method and the generalized limit equilibrium wedge method. The FEM–IDPM has the advantage over limit equilibrium methods that the strain- and time-dependent behaviour of soil and the staged construction of the slope can be modelled. Key words : critical slip surface, dynamic programming, factor of safety, finite element method, limit equilibrium method, slope stability.

scholarly journals A Slip-Line Field Analysis of the Deformation at the Confluence of two Glacier Streams

1970 ◽  
Vol 9 (56) ◽  
pp. 169-193 ◽  
Author(s):  
I. F. Collins
Keyword(s):  
Slip Line ◽  
Plastic Material ◽  
Yukon Territory ◽  
Field Analysis ◽  
Main Stream ◽  
Line Field ◽  
Perfectly Plastic ◽  
Line Theory ◽  
Intense Shear ◽  
The Ideal

The deformation and state of stress at the confluence of two glacier streams are analysed using the techniques of slip-line theory. The valley walls are taken to be vertical parallel planes and the deformation is supposed independent of depth. The mechanical behavior of ice is modeled by the ideal rigid/perfectly plastic material.Detailed solutions are presented for the deformation at the confluence of one or more tributaries with a main stream and of two main streams. Attention is concentrated on predicting the number, position and magnitude of the bands of intense shear which emanate from some of the junction corners. The predictions of this idealized theory are compared with field data from a confluence on the Kaskawulsh Glacier, Yukon Territory, Canada.

Complex Slope Stability Analysis of Slip Surface Stress Method Based on Nader Hypoplastic Model

2011 ◽  
Vol 243-249 ◽  
pp. 2071-2075
Author(s):  
Bao Lin Xiong ◽  
Jin Song Tang ◽  
Chun Jiao Lu
Keyword(s):  
Slope Stability ◽  
Surface Stress ◽  
Factor Of Safety ◽  
Slip Surface ◽  
Strain Analysis ◽  
Search Method ◽  
Pattern Search ◽  
Critical Slip Surface ◽  
Hypoplastic Model ◽  
Pattern Search Method

Hypoplaticity and Nader hypoplastic model are introduced. Based on finite element stress-strain analysis of Nader hypoplastic model, slip surface stress method in the slope stability is provided. The factor of safety of the slip surface is defined as the ratio of the critical shear intensity during failure to real shear stress and the critical slip surface of slope is ascertained with pattern search method. The clay slope with a weak foundation layer and clay slope with a foundation layer including a thin weak layer under the plane strain condition are analyzed. The results are shown that the shapes of critical slip surface and the magnitude of factor of safety are obtained by this method.

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