土体热力学本构模型的分析与验证  

Analysis and Verification of Thermomechanical Constitutive Model for Soil

作　　者：花丽坤[1] 李学丰[2] 孔亮[3] 

机构地区：[1]宁夏大学机械工程学院,宁夏银川750021 [2]同济大学地下建筑与工程系,上海200092 [3]宁夏大学固体力学研究所,宁夏银川750021

出　　处：《宁夏大学学报（自然科学版）》2009年第2期139-143,共5页Journal of Ningxia University(Natural Science Edition)

基　　金：宁夏高等学校科学研究基金资助项目;教育部新世纪优秀人才支持计划资助项目(NCET-05-0895)

摘　　要：分析介绍了Collins提出的土体热力学模型.该模型不仅结构简单,满足热力学原理,且通过参数的不同取值,可得到包括修正剑桥模型在内的不同屈服面的形式,具有较大的适应性和灵活性.基于微细观力学原理,深入分析了模型参数的物理意义,并导出了模型的应力应变关系.编制了该模型的点积分程序,选用具有强减缩特性的淤泥质软黏土的偏压固结不排水三轴试验结果,通过对试验结果的模拟,验证了模型的适应性与有效性.The thermomechanical constitutive model for soils proposed by Collins is introduced and analyzed firstly. The model not only has a simple structure and satisfies the laws of thermodynamics, but also can be transferred to different yield surface, including modified Cambridge model, by changing the value of parameters. The physical mean of model parameters are analyzed deeply based on the micro- and meso- mechanics. The stress and strain relation is deduced. And then, simulation program of a thermomechanical model are worked out. The adaptability and validity of the model can be seen from the comparison between the model simulation and the triaxial test results of soft clay.

关 键 词：本构模型 热力学 弹塑性 模型验证 

分 类 号：TU43[建筑科学—岩土工程] O34[建筑科学—土工工程]