STRUCTURAL DAMAGE MODEL OF UNSATURATED EXPANSIVE SOIL AND ITS APPLICATION IN MULTI-FIELD COUPLE ANALYSIS ON EXPANSIVE SOIL SLOPE  

作　　者：卢再华 陈正汉 方祥位 郭剑峰 周海清 

机构地区：[1]Logistic Engineering University Chongqing 400041, P. R. China [2]Navy University of Engineering, Wuhan 430033, P. R. China [3]Key Laboratory for the Exploitation of Southwestern Resources and the Environmental Disaster Control Engineering,Ministry of Education,Chongqing University, Chongqing 400044, P. R. China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2006年第7期891-900,共10页应用数学和力学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (No.10372115)

摘　　要：Focused on the sensitivity to climate change and the special mechanical characteristics of undisturbed expansive soil, an elasto-plastic damage constitutive model was proposed based on the mechanics of unsaturated soil and the mechanics of damage. Undisturbed expansive soil was considered as a compound of non-damaged part and damaged part. The behavior of the non-damaged part was described using non-linear constitutive model of unsaturated soil. The property of the damaged part was described using a damage evolution equation and two yield surfaces, i.e., loading yield （LY） and shear yield （SY）. Furthermore, a consolidation model for unsaturated undisturbed expansive soil was established and a FEM program named UESEPDC was designed. Numerical analysis on solid-liquid-gas tri-phases and multi-field couple problem was conducted for four stages and fields of stress, displacement, pore water pressure, pore air pressure, water content, suction, and the damage region as well as plastic region in an expansive soil slope were obtained.Focused on the sensitivity to climate change and the special mechanical characteristics of undisturbed expansive soil, an elasto-plastic damage constitutive model was proposed based on the mechanics of unsaturated soil and the mechanics of damage. Undisturbed expansive soil was considered as a compound of non-damaged part and damaged part. The behavior of the non-damaged part was described using non-linear constitutive model of unsaturated soil. The property of the damaged part was described using a damage evolution equation and two yield surfaces, i.e., loading yield （LY） and shear yield （SY）. Furthermore, a consolidation model for unsaturated undisturbed expansive soil was established and a FEM program named UESEPDC was designed. Numerical analysis on solid-liquid-gas tri-phases and multi-field couple problem was conducted for four stages and fields of stress, displacement, pore water pressure, pore air pressure, water content, suction, and the damage region as well as plastic region in an expansive soil slope were obtained.

关 键 词：unsaturated expansive soil elasto-plastic damage constitutive model CONSOLIDATION soil slope RAINING EVAPORATING numerical analysis 

分 类 号：TU43[建筑科学—岩土工程]