Original scientific paper

https://doi.org/10.17559/TV-20161016085231

Stability Analysis of Earth Slope Using Combined Numerical Analysis Method Based on DEM and LEM

Jing-jing Meng ; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China / Centre for Geotechnical Science and Engineering, University of Newcastle, Newcastle 2308, Australi
Yi-xian Wang ; Hefei University of Technology, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China / State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan,
Yan-lin Zhao orcid.org/0000-0002-3028-3297 ; Hunan University of Science and Technology, Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technolog
Hang Ruan ; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China
Yan Liu ; State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology), Beijing, 100081, China

Abstract

Based on a 2D discrete element method (PFC2D code) and limit equilibrium method, a new method is proposed to obtain critical slip surface and to determine the factor of safety of the slope model. After the calibration process, the excavation process on the rectangular assembly of particles can make the slope model of the DEM. As the trial acceleration of gravity increases, the critical slip surface tends to change from shallow to deep, which indicates more serious failures in the slope. With higher trial accelerations of gravity, the factor of safety calculated by this method continually increases as well. Therefore, the critical trial acceleration of gravity that places the slope in a critical state of failure is essential to ensure the results are correct. The gravity increase method is applied to render the critical state of failure for slope model. As soon as the continuous failure surface forms, the influence parameters of particles on the critical slip surface also can be determined. Connecting the centre of these particles forms the critical slip surface, which is more consistent with the actual situation in nature due to the absence of assumptions of the critical slip surface in this method. Then, the factor of safety is calculated by the Spencer method that has the ability of dealing with noncircular, complex slip surface. This method proves to be a promising tool to analyse slope stability with the DEM. The character of progressive failure process of slope can be well modelled by DEM by investigating the development of failure in the slope body. By studying temporal and spatial risk of slope instability by the total failure process, it is possible for managers and engineers to detect temporal and spatial risks so robust suggestions and mitigation measures can be made.

Keywords

critical slip surface; discrete element method; factor of safety; progressive failure analysis; slope stability analysis

Hrčak ID:

207421

URI

https://hrcak.srce.hr/207421

Publication date:

28.10.2018.

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