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Stability analysis of cohesive soil embankment slope based on discrete element method

基于离散元法的黏性土路堤边坡稳定性分析

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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.

摘要

为了研究黏性土边坡的安全系数和失稳过程,采用离散单元法(DEM),运用DEM 软件PFC2D 模拟三轴试验,研究颗粒微观参数对黏性土宏观特性的影响,并在此基础上对DEM 模型的微观参数 进行标定。采用强度折减法和重力增加法对路堤边坡稳定性进行了分析,结果表明,强度折减法得到 的安全系数较为保守,重力增加法下的滑动面弧形特征更加明显。在整个渐进破坏过程中,两种方法 得到的破坏趋势、最大位移和速度变化是一致的。边坡破坏时,上部开裂,中部剪切,下部挤压破坏。 本文的结论可应用于黏性土边坡的安全系数计算和失稳过程分析。

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Authors and Affiliations

  1. School of Transportation, Southeast University, Nanjing, 211189, China

    Guang-ji Xu  (徐光霁), Kun-zhi Zhong  (钟昆志), Jian-wei Fan  (范剑伟) & Ya-jing Zhu  (朱雅婧)

  2. Aston Institute of Materials Research, Engineering Systems & Management Group, Aston University, Birmingham, B4 7ET, UK

    Yu-qing Zhang  (张裕卿)

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  1. Guang-ji Xu  (徐光霁)
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Correspondence to Jian-wei Fan  (范剑伟).

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Foundation item: Project(51808116) supported by the National Natural Science Foundation of China; Project(BK20180404) supported by the Natural Science Foundation of Jiangsu Province, China; Project(KFJ170106) supported by the Changsha University of Science & Technology via Open Fund of National Engineering Laboratory of Highway Maintenance Technology, China; Project(242020R40133) supported by Fundamental Research Funds for the Central Universities, China

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Xu, Gj., Zhong, Kz., Fan, Jw. et al. Stability analysis of cohesive soil embankment slope based on discrete element method. J. Cent. South Univ. 27, 1981–1991 (2020). https://doi.org/10.1007/s11771-020-4424-9

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