Simulation of Triaxial Tests for Unsaturated Soils under a Tension-Shear State by the Discrete Element Method

被引：3

作者：

Cai, Guoqing ^{[1
,2
]}

Li, Jian ^{[1
,2
]}

Liu, Shaopeng ^{[3
]}

Li, Jiguang ^{[4
]}

Han, Bowen ^{[2
]}

He, Xuzhen ^{[5
]}

Zhao, Chenggang ^{[1
,2
]}

机构：

[1] Beijing Jiaotong Univ, Key Lab Urban Underground Engn, Minist Educ, Beijing 100044, Peoples R China

[2] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China

[3] CCCC Highway Consultants Co Ltd, Beijing 100088, Peoples R China

[4] Fujian Acad Bldg Res, Fuzhou 350025, Peoples R China

[5] Univ Technol Sydney, Sch Civil & Environm Engn, Ultimo 2007, Australia

来源：

SUSTAINABILITY | 2022年 / 14卷 / 15期

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

unsaturated soil; discrete element method; triaxial tensile-shear; tensile-shear strength; BONDED-PARTICLE MODEL; MECHANICAL-BEHAVIOR; STRENGTH; FRAMEWORK; CRACKING; FAILURE;

D O I：

10.3390/su14159122

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this paper, the discrete element method is used to simulate triaxial tests of unsaturated soil under a tension-shear state. A relationship between water content and uniaxial tensile strength with different void ratios is obtained, which is applied to uniaxial tensile discrete element simulations to establish a relationship between grain-scale parameters and water content from back analysis. A group of triaxial simulations for unsaturated soil under a tension-shear state is then conducted. The discrete element method is used to obtain the relationship between deviatoric stress and axial displacement with different water contents, and also to reveal the effects of water content on peak strength and dilatancy phenomena with different confining pressures. The displacement fields of numerical specimen are analyzed qualitatively, and the mechanism and process of failure are discussed from the prospective of energy and dissipation.

引用

页数：17

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