Liquid-Bridge Contact Model of Unsaturated Granular Materials and its Application in Discrete-Element Method

被引：4

作者：

Cai, Guoqing ^{[1
,2
]}

Li, Jian ^{[1
,2
]}

Liu, Shaopeng ^{[3
]}

Li, Jiguang ^{[2
]}

Zhao, Chenggang ^{[1
,2
]}

机构：

[1] Beijing Jiaotong Univ, Minist Educ, Key Lab Urban Underground Engn, 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

来源：

INTERNATIONAL JOURNAL OF GEOMECHANICS | 2021年 / 21卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Unsaturated soil; Discrete-element method; Uniaxial tensile strength; Liquid-bridge contact model; Water retention angle; BONDED-PARTICLE MODEL; MECHANICAL-BEHAVIOR; SHEAR-STRENGTH; MICROMECHANICS; SIMULATION; FAILURE; SOIL;

D O I：

10.1061/(ASCE)GM.1943-5622.0002122

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

In the past, the capillary effect is rarely considered for microcontact models when two adjacent particles are separated by a certain distance. In this paper, a liquid-bridge contact model of unsaturated particles is presented, which is applied to the discrete-element software PFC. Based on this, simulations of uniaxial tensile for unsaturated soils under (2D) situation are carried out, and influence of a water retention angle on uniaxial tensile strength are studied. The simulation results show that the uniaxial tensile strength of unsaturated soil decreases gradually with the increase of the water retention angle, obvious cracks generate at both ends of the soil samples, and the soil sample possesses a residual strength. According to the particle displacement field, velocity field, and contact force chain, the failure forms of samples with different water retention angles are determined. Based on the rose diagram of normal contact force, the changes of its direction and value during failure process are observed directly, so as to analyze the evolution law of contact force for unsaturated soils.

引用

页数：10

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