Elastoplastic-damage-seepage coupling model and numerical algorithm for rock slope stability evaluation

2021 ◽  
pp. 105678952110116
Author(s):  
Mengfei Xu ◽  
Annan Jiang ◽  
Xiurong Yang ◽  
Tengfei Jiang
Keyword(s):  
Slope Stability ◽  
Numerical Algorithm ◽  
Coupling Model ◽  
Stability Evaluation ◽  
Backward Euler ◽  
Geological Conditions ◽  
Calculation Results ◽  
The Stability ◽  
Elastoplastic Damage ◽  
Slope Safety

The stability of slope under complex geological conditions is one of the essential issues in geotechnical engineering. The mechanical damage caused by external force load and the hydraulic property of rock have both significant influences on slope stability. However, the two factors and the coupling process between them are not considered in the traditional slope safety calculation method. Firstly, in this paper, an elastoplastic-damage-seepage coupling model is established based on the modified Mohr-Coulomb (M-C) criterion. This model takes into account the weakening effect of damage on the strength of rock mass. Further, according to the Biot's theory and the evolution equation of permeability coefficient, a complete hydraulic-mechanics (HM) coupling model is established. Secondly, the fully implicit backward Euler algorithm and "strict-cornered" algorithm are used to integrate the stress precisely. The complete coupling analysis of HM is implemented by the step-by-step iterative method. By combining the centrifugal loading method (CLM) with the FEM program, the factor of slope safety (FOS) under the coupling influence of damage-seepage can be solved. The calculation results showed that, compared with the traditional rounded M-C model, the results obtained by the "strict-cornered" algorithm method in this paper are closer to the theoretical solution. The solution process is robust with a global second-order convergence rate. After considering the effects of damage and seepage, the FOS is obviously reduced. Finally, the model is applied to the stability evaluation of an actual engineering. The variation rules of pore water pressure, displacement field, damage zone and FOS are calculated under different head heights. The model built in this paper considers the coupling characteristics of rock seepage-stress-damage well. The proposed numerical algorithm ensures the accuracy and rationality of the calculation results which provides a theoretical foundation for engineering application.

Slope Stability Analysis under the Condition of Seepage

2012 ◽  
Vol 204-208 ◽  
pp. 241-245
Author(s):  
Yang Jin
Keyword(s):  
Finite Element Method ◽  
Shear Strength ◽  
Slope Stability ◽  
Negative Impact ◽  
Strength Reduction ◽  
Soil Slope ◽  
Failure State ◽  
Calculation Results ◽  
The Stability ◽  
Shear Strength Reduction

The stability of soil slope under seepage is calculated and analyzed by using finite element method based on the technique of shear strength reduction. When the condition of seepage or not is considered respectively, the critical failure state of slopes and corresponding safety coefficients can be determined by the numerical analysis and calculation. Besides, through analyzing and comparing the calculation results, it shows that seepage has a negative impact on slope stability.

Analysis of the Relative Position of the Slope and Underground Mining Area and its Influence Properties

2013 ◽  
Vol 634-638 ◽  
pp. 3277-3281 ◽  
Author(s):  
Shi Guo Sun ◽  
Hong Yang ◽  
Chun Sheng Li ◽  
Bao Lin Zhang ◽  
Jia Wang ◽  
...  
Keyword(s):  
Slope Stability ◽  
Underground Mining ◽  
Mining Area ◽  
Open Pit ◽  
Stability Factor ◽  
Mining Depth ◽  
Extracellular Region ◽  
Geological Conditions ◽  
Slope Rock ◽  
The Stability

The stability state of slope rock mass is relating to each other’s relative location during the transformation from open-pit to underground mining, it’s the most disadvantageous influence on the slope stability when the underground mining area is located in the toe of slope, and it’s the best influence as in the slope extracellular region. Slope stability factor changes with the geometric dimensions of underground mining increased, but not in direct proportion. Under the condition of constant geometric dimensions of mining area, the influence on slope stability is changing with the mining depth increased. Thus indicating that the influence on slope stability by underground mining has its spatial property, and to determine the specific influence value requires a combination of many factors, such as the relationship of relative spatial position, the geometric dimensions of mining area, engineering geological conditions and so on.

Analysis about Stability of a Slope

2014 ◽  
Vol 580-583 ◽  
pp. 152-155
Author(s):  
Ya Jun Yin ◽  
Guang Han Xu ◽  
Yong Mei Qian
Keyword(s):  
Numerical Simulation ◽  
Slope Stability ◽  
Ratio Method ◽  
Stability Evaluation ◽  
Slope Ratio ◽  
Geological Conditions ◽  
Slope Ratio Method

Based on the engineering geological conditions of an artificial slope is analyzed using a combination of numerical simulation, the slope ratio method and other methods, the slope stability was evaluated, It has a certain reference to artificial slope stability evaluation that similar to a combination of soil and rock.

Analysis and Study on Slope Stability of High Fill Subgrade

2014 ◽  
Vol 919-921 ◽  
pp. 637-640 ◽  
Author(s):  
Qi Zhang
Keyword(s):  
Finite Element Method ◽  
Slope Stability ◽  
Slope Failure ◽  
Lateral Displacement ◽  
Limit Equilibrium ◽  
Soil Deformation ◽  
High Slope ◽  
Calculation Results ◽  
External Conditions ◽  
The Stability

The slope failure of high fill embankment have a large proportion under self-weight and external conditions,Because of the complexity of the soil deformation and stress,General methods such as the limit equilibrium and numerical analysis have their own limitations,The paper takes high fill subgrade engineering in Fujian province as the background.Adopting analytical method and finite element method calculate the stability coefficient and lateral displacement of high fill embankment slope.moreover,Making a comprehensive judgement to the stability of the slope by comparing with the actual value.The results show that calculation results of these two methods are close.Which can make accurate predictions on high slope stability and determine a judgement.and provides an effective method for the design and construction of the similar project.

The Stability Evaluation of the Landslide in the Northwest Sit of Certain a Substation

2012 ◽  
Vol 170-173 ◽  
pp. 187-190
Author(s):  
Pei Xi Guo
Keyword(s):  
Limit Equilibrium ◽  
Two Dimensional ◽  
Stability Evaluation ◽  
Soil C ◽  
Limit Equilibrium Theory ◽  
Transformer Substation ◽  
Geological Conditions ◽  
Calculation Process ◽  
The Stability ◽  
Investigation Report

The landslide which located in the northwest of the transformer substation was studied and the evaluation of the stability was contained.Through analyzing the regional geological conditions and landslide engineering conditions, summary of the reason of the landslide was made. Based on two-dimensional rigid body limit equilibrium theory, residual thrust method was used in calculation. Through the researching of the landslide, some factors that play important role were found. According to the investigation report, select the main slip profile as the basis for calculating. Combining with soil C&φ, the value of the inversion parameters can be got. Calculation process contained two engineering conditions. In the natural condition, the landslide is stable, and in the rainstorm condition, the landslide is not stable.

Stability Analysis of Highway Tunnel Portal Slope in Shiyan Area

2011 ◽  
Vol 368-373 ◽  
pp. 2824-2827
Author(s):  
Sheng Li Liu ◽  
Wen Guang Zhao ◽  
Yang Zhang ◽  
He Jie Gao ◽  
Fang Wei Fu
Keyword(s):  
Slope Stability ◽  
Natural State ◽  
Test Results ◽  
Highway Tunnel ◽  
Management Measures ◽  
Geological Conditions ◽  
Mechanism Of Landslide ◽  
The Stability ◽  
Rock Strata ◽  
Tunnel Portal

Under the control of the tow-Yun fracture, the geological conditions are complicated and the rock strata is broken in Shiyan area ,in the northwest of Hubei province, and the rock mass is weathered into fragment. When Highway is built in this area, a lot of tunnel portal slope and landslide problems will be met. To properly solve these problems, it is needed to analyze the slope stability and to propose appropriate management measures. In the paper, taken a highway tunnel portal slope in Shiyan area for example, a detailed research was made on the mechanism of landslide formation, and using laboratory soil test results and the simple Janbu method, the local and global slope stability is calculated. The results show that the slope is stable in natural state, and in heavy rains the stability coefficient is reduced quickly and the slope will be sliding. So the slope needs to manage and the rain water needs to control.

Stability Analysis of High Filling Slope Effected by Precipitation Duration

2012 ◽  
Vol 204-208 ◽  
pp. 312-315
Author(s):  
Zeng Rong Liu ◽  
Shao Feng Luo
Keyword(s):  
Slope Stability ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Safety Coefficient ◽  
Stability Of Slope ◽  
The Stability ◽  
Duration Condition ◽  
Unsaturated Seepage ◽  
Slope Safety

Aiming at researching on stability of high filling slope effected by precipitation duration. Transient saturated-unsaturated seepage method and slope stability finite element method is combined in this paper. Vadose field of slope is simulated in different precipitation duration condition. On the basis of vadose field author analyses the stability of slope effected by precipitation duration. The research results indicate that change of the pore water pressure is mainly concentrated in the position where the water level changes in the process of precipitation. After the precipitation pore water pressure gradually dissipates. Precipitation duration has great effect on the slope stability. With the precipitation duration increases the slope safety coefficient decreases. The slope safety coefficient decreases in the process of precipitation, but after precipitation, it increases gradually and eventually be more stable. The longer the precipitation duration is, the longer time that the safety coefficient reaches the ultimate stability required.

scholarly journals Evaluation of Slope Stability of Reservoir Considering Heterogeneous Soil Properties

2020 ◽  
Vol 20 (6) ◽  
pp. 167-175
Author(s):  
Seungwon Shin ◽  
Sangbeen Lee ◽  
Sungsu Lee ◽  
Jongwon Jung
Keyword(s):  
Slope Stability ◽  
Spatial Heterogeneity ◽  
Material Properties ◽  
Evaluation Method ◽  
Stability Evaluation ◽  
Heterogeneous Soil ◽  
Local Properties ◽  
The Stability ◽  
The Cost ◽  
Cost Effect

The slope stability evaluation of reservoirs is required because of the aging of reservoirs. Reservoir levees are designed to achieve homogeneous construction, but the spatial heterogeneity of the material properties of reservoirs is unavoidable. Because the existing method for evaluating reservoir stability is limited in terms of considering the spatial heterogeneity of material properties, the stability evaluation was conducted in this study, in which the spatial heterogeneity and uncertainty of the material properties of the reservoir levee were considered. In addition, the results for the existing and proposed methods were compared and analyzed, and the variability of the entire material properties of the reservoir levee, instead of spatial heterogeneity, was reflected. The evaluation results confirmed that the probability of failure obtained using the proposed method was lower than that for the existing stability evaluation method, considering the variations in material properties because the levee did not reach the critical state, owing to changes in local properties. Therefore, the proposed method is useful for the cost-effect repair and reinforcement of reservoir slopes, compared to the existing slope stability evaluation method.

scholarly journals Slope Stability Problems Along the Main Roads in the Kurdistan Region

2018 ◽  
Vol 7 (4) ◽  
pp. 197
Author(s):  
Varoujan K. Sissakian ◽  
Hassan O. Omer
Keyword(s):  
Slope Stability ◽  
Winter Season ◽  
Road Construction ◽  
Heavy Rain ◽  
Modern Technology ◽  
Kurdistan Region ◽  
Stability Problems ◽  
Geological Conditions ◽  
Different Types ◽  
The Stability

The Kurdistan Region is covered by the relevant net of roads. Since the major parts of the Kurdistan Region are mountainous; therefore, the majority of them are in snake curve form. Construction of roads in mountainous areas will destroy the natural slopes, and when not treated; then different types of landslides will occur. Accordingly, the unstable slopes will cause a lot of risk to the traffic along the roads; endangering the driving along those roads; especially during winter season, and during and/ or shortly after heavy rain showers. The majority of the roads in the Kurdistan Region are planned, designed and constructed without considering the geological conditions, which include four parameters: 1) Type of the rocks and soils, 2) Dip direction and amount, 3) Intensity of joint planes, and 4) Weathering grade of the rocks. These are not considered due to: 1) Cost, 2) Construction’s duration, 3) Choosing easier paths, 4) Absence of experience, 5) Absence of modern technology, 6) Absence of road construction codes, and 7) Ignorance of the factor of safety. We studied different examples from roads in the Kurdistan Region and presented different types of slope stability problems. Moreover, we presented recommendations to keep the stability along unstable slopes.

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