循环载荷下砂质土的本构模型

THE CONSTITUTIVE MODEL FOR SANDY SOIL UNDER CYCLIC LOADING

提出了一个描述砂质土循环载荷条件下主要特性的本构模型，并且采用不同围压下多种加载途径的土力学实验确定了模型中的待定材料常数．由本构模型的增量表达式数值积分计算所得到的理论曲线与不同应力路径下实验曲线十分接近．经实验验证这种本构模型能广泛地应用土工问题的弹－塑性有限元分析中．

A constitutive model is proposed for describing the main behaviors of sandy soil under cyclic loading, and the laboratory tests of soil mechanics under different confining pressure and various stress paths have been performed for determining the material constants. The incremental formulae of the constitutive model are numerically integrated for obtaining the theoretical curve and the calculated curve are close to the experimental data under different stress paths. This verificated constitutive model can be widely applied in elasto plastic finite element analysis of geotechnique problems.