基于物态本构模型的路基动力反应分析

Dynamic response analysis of road foundation based on physical state dynamic constitutive model

以动力固结理论和瞬态动力学理论为基础,将有效应力物态动本构关系引入到以动力反应与动力固结相耦合、静应力与动应力变化相耦合、孔压的产生、扩散和消散相耦合的动力三维瞬态动力学基本方程组中,形成了饱和土体有效应力物态地震反应分析的完整理论体系。利用有限元法对饱和路基进行了瞬态地震反应分析,较好地反映了土体在震动过程中剪胀、剪缩的实际性态,比以往引进孔压模型和静.动交替分析计算更为合理。

The achievement of this research is the fundamentals of a 3-D dynamic consolidation with governing equation established on the basis of transient dynamics theory,characterized by drawing into it the effective stress and physical states dynamic constitutive relation and coupling the dynamic response and dynamic consolidation,static stress and dynamic stress,pore water pressure generation,pore water pressure diffusion,dissipation with each other so that to simulation the true process of stress-strain response of soil mass and to form a complete theoretical framework system of the seismic response analysis approach based on effective stress and physical states of soil mass.This method can reflect the shear dilatation-contraction real behaviors of saturated soil road foundation under earthquake;and it is more reasonable than usual static-dynamic alternate analysis method by finite element method.