scholarly journals Slope stability analysis under rainfall conditions considering unsaturated characteristics of materials

2020 ◽  
Vol 165 ◽  
pp. 03030
Author(s):  
Sha Wang ◽  
Guodong Mei ◽  
Xuyang Xie ◽  
Li Yaoxuan ◽  
Lu Yao
Keyword(s):  
Slope Stability ◽  
Safety Management ◽  
Limit Equilibrium ◽  
Extreme Rainfall ◽  
Calculation Model ◽  
Mine Safety ◽  
Stability Calculation ◽  
Safety Coefficient ◽  
Practical Engineering ◽  
Seepage Theory

As one of the important facilities in mines, the dump has become one of the major hidden dangers of mine safety management due to its large volume and loose structure. In this paper, based on unsaturated seepage theory of soil and practical engineering slope cases, the slope stability calculation model based on Bishop limit equilibrium method is established. This paper analyzes and calculates the evolution law of slope stability under extreme rainfall, obtains the law of slope stability safety coefficient changing with rainfall under unsaturated characteristics, and puts forward the corresponding countermeasures.

Calculation of Wave-Induced Shallow Stratum Seabed Slides in the Subaqueous Yellow River Delta

2009 ◽  
Author(s):  
Guohui Xu ◽  
Xin Wang ◽  
Congcong Wei ◽  
Zibu Fu ◽  
Qingpeng Zhao
Keyword(s):  
Slip Surface ◽  
Yellow River ◽  
Limit Equilibrium ◽  
Yellow River Delta ◽  
Friction Angle ◽  
Calculation Model ◽  
Safety Coefficient ◽  
Wave Flume ◽  
Calculation Results ◽  
Wave Induced

Wave-induced seabed slide could happen even at very gently sloping silty seabed. Based on the wave-seabed interaction, the safety coefficient calculation model of wave-induced gentle seabed slides in the seabed instability was carried out using limit equilibrium method, Bishop Method, in this paper. The calculated results shows that the effective internal cohesion c′ and the effective internal friction angle φ′ affect the location of slip surface and the magnitude of the safety coefficient significantly. The safety coefficient rises linearly with the increases of c′ and φ′ at a fixed depth. The results fit reasonable well with the slide calculation results from a wave flume experiment in laboratory. Additionally, it was concluded that the silty seabed tended to slide under wave actions at the depth less than 5 meters in the Yellow River Subaqueous Delta.

scholarly journals Slope Stability Calculation Method of Highwall Mining with Open Cut Mines as an Example

2021 ◽  
Author(s):  
Juyu Jiang ◽  
Ye Lu ◽  
Dong Wang ◽  
Xinping Han
Keyword(s):  
Slope Stability ◽  
Recovery Rate ◽  
Limit Equilibrium ◽  
Coal Pillar ◽  
Time Dependent ◽  
Universal Method ◽  
Stability Calculation ◽  
Target Time ◽  
Highwall Mining ◽  
Overlying Strata

Abstract Highwall mining machines have been used to recover retained coal at the toe of highwalls and endwalls over the past few decades. However, there has not been a universal method to evaluate the slope stability using highwall mining while maximizing the recovery rate. Based on the required service time of coal pillars, this study proposes the concept of the target time pillar strength. To obtain time-dependent parameters for the coal, time-dependent shear tests were performed on specimens from an open-cut mine in Inner Mongolia. The highwall mining length was divided into three categories based on discontinuous structural plane theory: goaf, yielding, and elastic zones. The three zones were considered to all have resistances against shear stress. The basal coal seam is likely to become weak due to weight from the overlying strata, which may change the slope failure mode from circular to sliding along the weak layer. Numerical modeling was used to study the influence of the overlying strata and target time strength on the yielding zone development at the coal pillar ribs. The coefficients of the three zones were determined and substituted into the Mohr-Coulomb equation to obtain the time-dependent shear strength parameters. Subsequently, the influence of highwall mining on the slope stability was evaluated using the rigid body-limit equilibrium method (LEM). The optimized coal pillar width is determined to maximize the recovery rate without compromising the slope stability.

Stability Analysis of High Filling Slope Affected by Precipitation Intensity

2012 ◽  
Vol 170-173 ◽  
pp. 1174-1178 ◽  
Author(s):  
Wen Tao Wang ◽  
Tao Song ◽  
Zeng Rong Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Slope Stability ◽  
Precipitation Intensity ◽  
Safety Coefficient ◽  
Stability Of Slope ◽  
Seepage Theory ◽  
The Stability ◽  
Unsaturated Seepage ◽  
Element Method

Aiming at researching on stability of slope affected by precipitation intensity, transient saturated-unsaturated seepage finite element method and slope stability finite element method are combined in this paper. Vadose field of slope is simulated in different precipitation intensity. Based on vadose field, the writers analyzed the stability of slope affected by precipitation intensity. The research results indicate that water is brought together in the interface first. Then the water level moves toward up and down respectively from the both sides of the interface. On the basis of saturated-unsaturated seepage theory, precipitation intensity has little effect on the slope stability in the first 6 hours after precipitation. After that, slope safety coefficient is relatively high when precipitation intensity is smaller, and vice versa.

Stability Analysis on High and Steep Slope of Open-Pit Based on Limit Equilibrium Method

2015 ◽  
Vol 777 ◽  
pp. 106-111 ◽  
Author(s):  
Zhen Hua Xie ◽  
Ran Yi Xie ◽  
Xiao Yue Lu
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Slope Stability Analysis ◽  
Steep Slope ◽  
Open Pit ◽  
Safety Coefficient ◽  
The Stability ◽  
High And Steep Slope

The stability of slope in open-pit affects the economic benefits and safety production of mining enterprises. From the two aspects of internal factors and external factors, this paper analyses the factors affecting the slope stability of open-pit, discusses the basic theory of slope stability analysis, and puts forward the criterion of slope stability based on the safety coefficient. The limit equilibrium method is chosen to analyze the stability of the high and steep slope of open-pit in this paper, and the SLIDE software is used for numerical simulation according to the actual slope model of certain open-pit. The simulation results show that the slope safety coefficient of the instance is 1.01, which is unstable slope. When the number of the slope blocks is more than 40, the safety coefficient tend to be stable. Blasting vibration has a great influence on slope stability. The results of slope stability analysis provide a scientific guidance for the prevention and control of the slope instability.

scholarly journals Stability Calculation Method of Slope Reinforced by Prestressed Anchor in Process of Excavation

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zhong Li ◽  
Jia Wei ◽  
Jun Yang
Keyword(s):  
Slope Stability ◽  
Slip Surface ◽  
Calculation Model ◽  
Design Parameters ◽  
Search Model ◽  
Critical Slip Surface ◽  
Stability Calculation ◽  
Optimal Stability ◽  
Dynamic Search ◽  
Prestressed Anchor

This paper takes the effect of supporting structure and anchor on the slope stability of the excavation process into consideration; the stability calculation model is presented for the slope reinforced by prestressed anchor and grillage beam, and the dynamic search model of the critical slip surface also is put forward. The calculation model of the optimal stability solution of each anchor tension of the whole process is also given out, through which the real-time analysis and checking of slope stability in the process of excavation can be realized. The calculation examples indicate that the slope stability is changed with the dynamic change of the design parameters of anchor and grillage beam. So it is relatively more accurate and reasonable by using dynamic search model to determine the critical slip surface of the slope reinforced by prestressed anchor and grillage beam. Through the relationships of each anchor layout and the slope height of various stages of excavation, and the optimal stability solution of prestressed bolt tension design value in various excavation stages can be obtained. The arrangement of its prestressed anchor force reflects that the layout of the lower part of bolt and the calculation of slope reinforcement is in line with the actual. These indicate that the method is reasonable and practical.

scholarly journals Slope Stability Evaluation of Geosynthetic Reinforced Soil

2019 ◽  
Vol 8 (4) ◽  
pp. 7143-7147
Keyword(s):  
Slope Stability ◽  
Slope Failure ◽  
Pore Water Pressure ◽  
Limit Equilibrium ◽  
Water Pressure ◽  
Friction Angle ◽  
Calculation Model ◽  
Reinforced Soil ◽  
Unit Weight ◽  
Soil Parameters

The slippery of natural slope is sometimes ruled by combination of soil parameters and earthquake characteristics. Geotextiles could be a reinforcing materials and an application in numerous areas still as in geotechnical application to supply additional lateral restraint and forestall the high rise hill from failure. The analysis was aimed to analyze slope stability analysis, strengthened the Finite slope with non-woven geotextiles. The modal of hill was created within the SLOPE/W software system of GeoStudio that is predicated on limit equilibrium of slope analysis. The results of issue of safety square measure compared while not and with use of geotextiles in several layers. The issue of safety of slope failure will increase from three.437M to 9.978M victimization 3 layers of geotextiles at optimum height. Thus, this study confirms that the non-woven geotextiles may be applied in slope so as to enhance the soundness of natural or mam-made slope. During this regard, special stress is given to the sensitivity of the Calculation model input parameters like friction angle, cohesion, Pore water pressure and unit weight of soil that ought to contribute to raising awareness regarding these problems, as a requirement to create the proper selections and optimum technical resolution during this space.

SLOPE STABILITY ASSESSMENT IN THE OPENCAST QUARRY IN HAMMAM DALAA (M'SILA, ALGERIA)

2019 ◽  
pp. 8-13
Author(s):  
A. Aiss ◽  
Y. Cheikhaoui ◽  
A.I. Kanli ◽  
A. Benselhoub ◽  
F. Ariznavarreta
Keyword(s):  
Slope Stability ◽  
Limit Equilibrium ◽  
Stability Index ◽  
Stability Assessment ◽  
Safety Coefficient ◽  
Production Site ◽  
Main Factors

The aim of this study is to identify the main factors that affect the site's stability by using the adequate solutions, which help to solve the problems of slope stability at the quarry of Chouf Amar, Hammam Dalaa, Algeria. A large amount of geological, hydrogeological and mechanical data has been collected from the site. We realized the study of the influence of different factors on the safety coefficient. Limit equilibrium techniques have been adapted, taking into account the variability of the site data, to analyze the performance of the existing area of production site. Results solution under different configurations has shown that stability index is highly affected by hydraulic and seismic factors.

scholarly journals Study on Stability of Shield Tunnel Excavation Face in Soil-Rock Composite Stratum

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Hongtao Sui ◽  
Chao Ma ◽  
Chunquan Dai ◽  
Tingzhi Yang
Keyword(s):  
Limit Equilibrium ◽  
Three Dimensional ◽  
Earth Pressure ◽  
Calculation Model ◽  
Shield Tunnel ◽  
Support Pressure ◽  
Finite Element Software ◽  
Dimensional Finite Element ◽  
Practical Engineering ◽  
Three Dimensional Finite Element

In order to study the instability mode of shield excavation face in soil-rock composite stratum and determine the ultimate support pressure of excavation face, this paper selects two typical soil-rock composite strata and uses three-dimensional finite element software to study the failure development process of shield excavation face. Based on the principle of limit equilibrium, a calculation model of limit support pressure for soil-rock composite stratum is proposed and applied to practical engineering. It is found that the shape of “unloading loosening zone” is mainly determined by the properties of upper soil and the properties of lower rock mainly determine the scope and shape of “sliding instability zone.” With the increase of soil proportion coefficient, the ultimate bearing capacity increases nonlinearly and the growth rate decreases gradually. At the same time, the influence of overlying Earth pressure and soil cohesion cannot be ignored.

scholarly journals The Hydromechanical Interplay in the Simplified Three-Dimensional Limit Equilibrium Analyses of Unsaturated Slope Stability

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 73
Author(s):  
Panagiotis Sitarenios ◽  
Francesca Casini
Keyword(s):  
Analytical Solution ◽  
Slope Stability ◽  
Slope Failure ◽  
Failure Modes ◽  
Pore Water Pressure ◽  
Limit Equilibrium ◽  
Water Pressure ◽  
Three Dimensional ◽  
Stability Limit ◽  
Smooth Transition

This paper presents a three-dimensional slope stability limit equilibrium solution for translational planar failure modes. The proposed solution uses Bishop’s average skeleton stress combined with the Mohr–Coulomb failure criterion to describe soil strength evolution under unsaturated conditions while its formulation ensures a natural and smooth transition from the unsaturated to the saturated regime and vice versa. The proposed analytical solution is evaluated by comparing its predictions with the results of the Ruedlingen slope failure experiment. The comparison suggests that, despite its relative simplicity, the analytical solution can capture the experimentally observed behaviour well and highlights the importance of considering lateral resistance together with a realistic interplay between mechanical parameters (cohesion) and hydraulic (pore water pressure) conditions.

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