scholarly journals Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

2020 ◽  
Vol 10 (5) ◽  
pp. 1577
Author(s):  
Zheng-jun Hou ◽  
Bao-quan Yang ◽  
Lin Zhang ◽  
Yuan Chen ◽  
Geng-xin Yang
Keyword(s):  
Slope Failure ◽  
Rock Slope ◽  
Evaluation Method ◽  
Failure Modes ◽  
Similarity Theory ◽  
Fem Simulation ◽  
Strength Reduction ◽  
Comprehensive Method ◽  
The Stability ◽  
Bedding Rock Slope

In the construction of high dams, many high rock slope failures occur due to flood discharge atomized rain. Based on the steel frame lifting technique and strength reduction materials, a comprehensive method is proposed in this paper to study the stability of high bedding rock slope subjected to atomized rain. The safety factor expression of the comprehensive method and the evaluation method for deformation instability were established according to the similarity theory of geomechanical model, failure criterion, and mutation theory. Strength reduction materials were developed to simulate the strength reduction of structural planes caused by rainfall infiltration. A typical test was carried out on the high bedding rock slope in the Baihetan Hydropower Station. The results showed that the failure modes of the bedding rock slope were of two types: sliding–fracturing and fracturing–sliding. The first slip block at the exposed place of the structural plane was sliding–fracturing. Other succeeding slip blocks were mainly of the fracturing–sliding type due to the blocking effect of the first slip block. The failure sequence of the slip blocks along the structural planes was graded into multiple levels. The slip blocks along the upper structural planes were formed first. Concrete plugs had effective reinforcement to improve the shear resistance of the structural planes and inhibit rock dislocation. Finite element method (FEM) simulation was also performed to simulate the whole process of slope failure. The FEM simulation results agreed well with the test results. This research provides an improved understanding of the physical behavior and the failure modes of high bedding rock slopes subjected to atomized rain.

scholarly journals Stability Analysis of Jointed Rock Slope by Strength Reduction Technique considering Ubiquitous Joint Model

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Ruili Lu ◽  
Wei Wei ◽  
Kaiwei Shang ◽  
Xiangyang Jing
Keyword(s):  
Rock Slope ◽  
Reduction Method ◽  
Domain Size ◽  
Jointed Rock ◽  
Strength Reduction ◽  
Hydropower Station ◽  
Strength Reduction Method ◽  
Vertical Side ◽  
The Stability ◽  
Jointed Rock Slope

In order to study the failure mechanism and assess the stability of the inlet slope of the outlet structure of Lianghekou Hydropower station, the strength reduction method considering the ubiquitous joint model is proposed. Firstly, two-dimension numerical models are built to investigate the influence of the dilation angle of ubiquitous joints, mesh discretization, and solution domain size on the slope stability. It is found that the factor of safety is insensitive to the dilation angle of ubiquitous joints and the solution domain size but sensitive to the mesh discretization when the number of elements less than a certain threshold. Then, a complex three-dimension numerical model is built to assess the stability of the inlet slope of the outlet structure of Lianghekou Hydropower station. During the strength reduction procedure, the progressive failure process and the final failure surface of the slope are obtained. Furthermore, the comparison of factors of safety obtained from strength reduction method and analytical solutions indicates that the effect of vertical side boundaries plays an important role in the stability of jointed rock slope, and the cohesive force is the main contribution to the resistant force of vertical side boundaries.

Stability Analysis of Jointed Rock Slope Using Shear Strength Reduction Approach

2013 ◽  
Vol 423-426 ◽  
pp. 1321-1324 ◽  
Author(s):  
Li Juan Cao ◽  
Yu Ning Liu ◽  
Zi Chang Shangguan
Keyword(s):  
Shear Strength ◽  
Fracture Criterion ◽  
Rock Slope ◽  
Jointed Rock ◽  
Strength Reduction ◽  
Collapse State ◽  
The Stability ◽  
Jointed Rock Slope ◽  
Shear Strength Reduction ◽  
Reduction Approach

Finite element method is used to compute the factor of safety of jointed rock slope. The stability of jointed rock slope is simulated by using shear strength reduction approach. Mohr-Coulomb fracture criterion is used to evaluate the sticking or sliding state of jointed rock mass. The distribution of plastic zone at collapse state is determined. Numerical computational results show that the proposed procedure is effective to evaluate stability of jointed rock slope.

Study on the Correlation between the Stability of Slope and the Intensity of Rock Layer by Simulation Experiment

2011 ◽  
Vol 243-249 ◽  
pp. 2591-2595
Author(s):  
Ping Lu Huang ◽  
Cong Xin Chen
Keyword(s):  
Rock Slope ◽  
Simulation Experiment ◽  
Similarity Theory ◽  
Rock Layer ◽  
Rock Slide ◽  
Deformation And Failure ◽  
Shearing Strength ◽  
Stability Of Slope ◽  
Weak Plane ◽  
The Stability

Based on similarity theory, the two geologic mechanics models with different intensity of rock layer is established. The paper introduces the design and process of the experimentation. The correlation between the stability of consequent rock slope and the intensity of rock layer is studied. Results obtained show that deformation and breakage of the consequent slope first take place at joints and crannies near the surface. The bigger the intensity of rock layer is, the steadier the slope is. The water in rock cranny can reduce the shearing strength of the slope and lead to land slide. The deformation and failure mode of the slope with low intensity of rock layer is that rock slide along the weak plane as a whole.

scholarly journals Study on the Influence of Rainfall Infiltration on the High rock Slope of Open-pit Mine Stability using a New Nonlinear Strength Reduction Method

2021 ◽  
Author(s):  
Tianbai Zhou ◽  
Lingfan Zhang ◽  
Jian Cheng ◽  
Jianming Wang ◽  
Xiaoyu Zhang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Rock Slope ◽  
Reduction Method ◽  
Strength Reduction ◽  
Open Pit Mine ◽  
Open Pit ◽  
Strength Reduction Method ◽  
Rock Slopes ◽  
High Rock Slope ◽  
The Stability

Abstract Due to long-term mining, a series of high and steep rock slopes have been formed in the open-pit mine. For high rock slopes, rainfall infiltration is the main cause of landslide. Therefore, the stability analysis of high rock slope under rainfall has become a key issue in the open-pit mine engineering. In this work, aiming at the high stress condition of high rock slope, the instantaneous internal friction angle and instantaneous cohesion of rock mass under different stress states are deduced, and the a nonlinear strength reduction method for high rock slope is established according to the relationship between normal stress and shear stress of rock mass under the Hoke-Brown criterion. The numerical calculation results show that the factor of safety (FOS) for high rock slope calculated by the proposed method is more reasonable. Taking the southwest slope of Dagushan Iron Mine as the research background, the safety factors of high rock slope under different rainfall conditions are calculated by COMSOL Multiphysics. And the stability analysis of high rock slope in open-pit mine under rainfall are carried out.

Forecast and Analysis on the Stability of Open-Pit Ultra-High Slope

2012 ◽  
Vol 152-154 ◽  
pp. 802-808
Author(s):  
Fei Zhang ◽  
Jing Cao ◽  
Ming Chen ◽  
Lei Peng
Keyword(s):  
Slope Failure ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Strength Reduction ◽  
Open Pit ◽  
High Slope ◽  
Failure State ◽  
The Stability ◽  
Important Significance ◽  
The Continuum

Combining the explicit Lagrangian difference method for the continuum body and strength reduction technology, this paper analyzed the stability of Xian Feng open-pit. The generalized shear strain and plastic strain interconnected within the weak structural plane of slope are used as criterion to identify slope failure state. Analysis of the example verifies that the criterion is rational. With the calculate model, it can predict the open-pit ultra-high slope stability after five years. Its results are similar to the traditional limit equilibrium method. Therefore, the method is reasonably practicable. So the result will be important significance to guide the post-construction of mine.

Reinforcement and Characteristic Analysis of Bolt Technology Applied in Bedding Rock Slope

2014 ◽  
Vol 580-583 ◽  
pp. 445-449
Author(s):  
En Hua Wang ◽  
Zhi De Wang ◽  
Li Min Jiang ◽  
Luo Hao ◽  
An Ran
Keyword(s):  
Yunnan Province ◽  
Rock Slope ◽  
Failure Modes ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Discrete Element ◽  
Characteristic Analysis ◽  
Safety Coefficient ◽  
Practical Engineering ◽  
Bedding Rock Slope

Discrete element software is used to simulate the excavation of a rock slope in Puli-Xuanwei Expressway in Yunnan Province. Through monitoring displacement development characteristics in different positions of slope, the result shows that the minimum horizontal displacement under excavation exists in the top of the slope, meanwhile the maximum horizontal displacement occurs in the foot and waist of the slope, and the maximum vertical displacement occurs in the top of the slope. Comparing rock slope in such conditions as different stratum angles, directions, rock characteristics and thickness, it concludes possible failure modes of slope and the variation law of safety coefficient under different conditions. This paper is instructive and offers reference for the practical engineering.

scholarly journals Stability Analysis Method for Rock Slope with an Irregular Shear Plane Based on Interface Model

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Changqing Qi ◽  
Jiabing Qi ◽  
Liuyang Li ◽  
Jin Liu
Keyword(s):  
Stability Analysis ◽  
Slope Failure ◽  
Rock Slope ◽  
Limit Equilibrium ◽  
Shear Plane ◽  
Interface Model ◽  
Analysis Method ◽  
Complex Shear ◽  
Potential Failure ◽  
The Stability

Landslide developed in rock mass usually has irregular shear plane. An approach for calculating distributed factor of safety of the irregular shear plane was put forward in this paper. The presented method can obtain not only the detailed stability status at any grid node of a complex shear plane but also the global safety of the slope. Thus, it is helpful to thoroughly understand the mechanism of slope failure. Comparing with the result obtained through the limit equilibrium method, the presented method was proved to be more accurate and suitable for stability analysis of rock slope with a thin shear plane. The stability of a potentially unstable rock slope was analyzed based on the presented method at the end of this paper. The detailed local stability, global stability, and the potential failure mechanism were provided.

The Stability Research of Highway Bedded Rock Slope Based on the Stress Monitoring

2013 ◽  
Vol 351-352 ◽  
pp. 1253-1256
Author(s):  
Yong Jian Guo
Keyword(s):  
Slope Failure ◽  
Rock Slope ◽  
Deformation Monitoring ◽  
Stress Monitoring ◽  
It Use ◽  
Monitoring Method ◽  
The Stability ◽  
Bedded Rock ◽  
Failure Location ◽  
Test Result

Research on the problem to process the stability of bedded rock slope of monitoring, deformation monitoring were carried out difficulty .This paper carrying out the stress monitoring method to evaluate it. Use the strength reduction FEM to reach the slope failure location with different structure planes distance, and use the theory and project test of blot stress monitoring to verify. The result of the project test shows that the slope stress were tend to stability about 60 days after cut,the bolt maximum force value were 57.6 MPa,meet the requirement of reinforced design tensile strength,the test result shows that this slope tend to stability.

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