一个反映土体复杂加卸荷路径的弹黏塑性模型  

MODELING COMPLICATED STRESS PATH OF CLAYS USING ANISOTROPIC ELASTIC-VISCOPLASTIC MODEL

作　　者：钦亚洲[1,2] 苏建伟 许建聪[2] 

机构地区：[1]南通大学交通学院,江苏南通226019 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]中国东方电气集团有限公司,成都610036

出　　处：《力学与实践》2012年第3期23-28,共6页Mechanics in Engineering

基　　金：国家自然科学基金资助项目(40872179)

摘　　要：基于Perzyna过应力理论,构造了一个土体各向异性弹黏塑性本构模型.模型引入Wheeler旋转硬化法则,能够较好的描述土体的初始各向异性和应力诱发各向异性.借助ABAQUS软件中UMAT子程序接口,模型采用隐式积分算法——图形返回算法实现.通过对一组复杂加卸荷路径的三轴不排水剪切试验(HKMD)及一组分级加载三轴不排水蠕变试验(Sachville clay)的模拟,表明本模型能够合理反映土体的率效应、应力松弛、蠕变及土体各向异性现象,验证了模型的有效性.This paper presents an improved three-dimensional anisotropic elastic-viscoplastic constitutive model based on overstress theory of Perzyna.A rotational hardening law of Wheeler is adopted to account for the initial anisotropy and the changes in anisotropy due to the viscous strains.The developed model is implemented by using ABAQUS software with UMAT subroutine,which is integrated with a return mapping algorithm.The undrained triaxial test for HKMD under complicated loading conditions and the multi-stage undrained triaxial creep test for Sachville clay were simulated by the proposed model.The simulated results show that the proposed anisotropic elastic-viscoplastic model can successfully reproduce the rate-sensitivity,relaxtion,creep and anisotropic behaviors of soft clays under different loading conditions.

关 键 词：复杂加卸荷路径 土体各向异性 图形返回算法 ABAQUS软件 UMAT子程序 

分 类 号：TU443[建筑科学—岩土工程]