非饱和土变形及渗流过程的有限元分析  

Finite element analysis of deformation and seepage process in unsaturated soils

作　　者：李锡夔[1] 范益群[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室

出　　处：《岩土工程学报》1998年第4期20-24,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家基础性研究重大项目;国家自然科学基金

摘　　要：提出了一个关于非饱和土变形及渗流问题的有限元分析数值模型，基于双应力变量公式定义了非饱和土广义有效应力。采用Ａｌｏｎｓｏ本构模型以模拟非饱和土的非线性力学行为。此外，通过引入应力空间下的自然坐标体系，对作为非光滑多重屈服面的Ａｌｏｎｓｏ本构模型推导了一个一致性算法。This paper presents a numerical model for the finite element analysis of transient deformation and seepage problems in unsaturated soils. A definition of the generalized effective stress for unsaturated soils is proposed on the basis of the two stress variable formula. The Alonso constitutive model to simulate the nonlinear mechanical behavior of unsaturated soils is integrated into the model. With introduction of the natural coordinates in the stress space a consistent algorithm for the non smooth multi surface pressure dependent plasticity is derived.

关 键 词：非饱和土 广义有效应力 变形 渗流 有限元 

分 类 号：TU431[建筑科学—岩土工程]