Stabilized Procedures for Finite Element Analysis in Saturated Soils Under Cyclic Loading

摘要

Conventional finite element procedures with equal order interpolations for saturated soil dynamic u - p formulation have been experiencing numerical difficulties for the problems concerning with small permeability and neglectable compressibility of pore-fluid. Such difficulties can be avoided by the staggered implicit-implicit algorithm and the direct α -method which were introduced by Huang et al. (2004). Several numerical examples for surface step loadings were given to demonstrate the performance of the proposed methods. Since the numerical examples for the step loadings are not typical for dynamic problems, which usually show the relatively strong oscillation nature of dynamic behaviors. Due to the necessity to show the effectiveness of the proposed stabilization techniques for cyclic loading problems, two numerical examples regarding saturated soils subject to a surface cyclic loading are presented in this paper. Discussion on uniform and non-uniform mesh configuration is also given.