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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 7    July 2020

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Stability analysis of cohesive soil embankment slope based on discrete element method
XU Guang-ji(徐光霁)1, ZHONG Kun-zhi(钟昆志)1, FAN Jian-wei(范剑伟)1, ZHU Ya-jing(朱雅婧)1, ZHANG Yu-qing(张裕卿)2

1. School of Transportation, Southeast University, Nanjing 211189, China;
2. Aston Institute of Materials Research, Engineering Systems & Management Group, Aston University, Birmingham B4 7ET, UK

Abstract:In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2D was used to simulate the triaxial test to study the influence of the particle micro parameters on the macroscopic characteristics of cohesive soil and calibrate the micro parameters of DEM model on this basis. Embankment slope stability analysis was carried out by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under the gravity increase method is more obvious. Throughout the progressive failure process, the failure trends, maximum displacements, and velocity changes obtained by the two methods were consistent. When slope was destroyed, the upper part was cracked, the middle part was sheared, and the lower part was destroyed by extrusion. The conclusions of this paper can be applied to the safety factor calculation of cohesive soil slopes and the analysis of the instability process.

 

Key words: embankment slope; cohesive soil; stability analysis; numerical simulation; PFC2D software; safety factor

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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