轴对称饱和土体结构在多向荷载下的液固耦合问题

Coupled liquid-solid problem of axisymmetric geotechnical structure due to multi-directional imposed loads

以轴对称系统液固二相耦合饱和介质为研究对象,在假定所有物理量沿径向和轴向可以变化但沿环向不变化、变形满足小变形、孔压流满足达西定律及有效应力原理成立的前提下,建立相应的增量形式的有限元分析方法。以一饱和轴对称试样为例,应用修正剑桥弹塑性模型,进行了应变控制式常规三轴固结不排水剪切试验过程的有限元模拟,以表明所建立方法的可行性。

Based on the assumption that all the variables are invariant in circular direction but can vary in the other two directions, FEM formulations are developed with the incremental unknowns for the coupled liquid-solid problem of axisymmetric geotechnical structure due to multi-directional imposed load. In the analysis, the medium is regarded as continuous, anisotropic, saturated, and it is assumed that small deformation occurs and either Darcy抯 law or effective stress principle holds true. Finally, a FEM simulation of the consolidated undrained triaxial compression test for a saturated axisymmetric sample are performed which can prove the present method true.