平面应变条件下砂土强度与土坝应力变形计算

本文对不同应变条件下砂土的抗剪强度及应力应变关系进行了对比试验研究;并根据推广的Von. Mises准则,导出了从常规三轴试验结果来预测平面应变条件下砂土的Mohr—Conlomb强度参数的计算式。本文对Duncan—Chang模型进行了修正,使之能初步反映平面应变条件下较为明显的应变软化现象,并对一典型的均质土坝断面,进行了有限元应力变形计算分析。

The Constitutive Rules of Sand under Plane Strain Conditions and FEM Analyis of Stress and strain Deformation for an Earth Dam

The constitutive rules of Sand under different strain conditions were compared through a series of experiments. The Mohr—Coulomb strength parameters of sand under plane strain condition were derived from the extended Von Mises criterion and extended Tresca criterion. The well-Known Duncan Chang model is modified in the paper, so that the obvious strain softening phenomenon can be computed by the model. The FEM analysis of sress and deformation for a typical earth dam section is also given in the paper.