防灾减灾工程学报2017，Vol.37Issue(4)：577-585,9.DOI:10.13409/j.cnki.jdpme.2017.04.011
热弹塑性土体本构模型及在多场耦合数值模拟中的应用
A Thermo-elastoplastic Constitutive Model for Soil and Its Application in Multiply Phase Coupling Numerical Simulation
摘要
Abstract
Based on the concept of "thermal equivalent stress",a new thermo-elastoplastic constitutive model,which is different from the traditional concept of plasticity that the plastic strain occurs below the normally yield surface,was proposed.In the model,the degree of saturation and skeleton stress were used as independent state variables that could describe the saturated and unsaturated soil behavior in a unified way.In addition,the concepts of sub-loading and superloading were also adopted that the overconsolidation and structure behavior of soil can also be described.The proposed model could simulate the mechanical performance of saturated/unsaturated soil at different temperature condition in consolidation tests and triaxial shear tests quite well.Meanwhile,the model was incorporated into soil-water-air-thermal multi-phase coupling field theory and a heating test in deep soft rock layer was simulated by FE-FD method.The agreement between the results of heating test and simulation confirmed the property of the proposed thermoelastoplastic constitutive model and numerical method.Thus,it could also be used in the analysis of energy piles and surround soils in the geothermal heat exchange system.关键词
热弹塑性本构模型/热等效应力/多场耦合理论/数值模拟Key words
thermo-elastoplastic constitutive model/thermal equivalent stress/multi-phase coupling field theory/numerical simulation分类
数理科学引用本文复制引用
包小华,熊勇林,崔宏志,明海燕..热弹塑性土体本构模型及在多场耦合数值模拟中的应用[J].防灾减灾工程学报,2017,37(4):577-585,9.基金项目
国家自然科学基金项目(51678369,51608385)、深圳市科技创新计划项目(JCYJ20150324140036839)资助 （51678369,51608385）
