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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
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
关键词
非饱和土
广义有效应力
变形
渗流
有限元
unsaturated soils, generalized effective stress,natural coordinates,constitutive modelling,consistent algorithm.
