Analyse And Improve Of The Methods For The Soil Dynamic Response Analyse

In this paper, based on the analysis and summary of the method for dynamic response of the soil as a two phase medium and considering the dynamic equilibrium as an instantaneous equilibrium corresponding to the real characteristics of stress, strain, pore water pressure , relating to the static and dynamic load as well as the change of the soil properties .The dynamic response and permeating consolidating are coupled to establish the governing equation which is based on the physics state constitutive model, the instantaneous dynamic response equations reports the character of shear bulge and shearing shrink in the mass .The equation is discreted both in space domain by using the Galerkin weighed residual method and in time domain by using the Newmark step -by-step integral method ,the FEM formula and the numerical methods for the consolidation analysis of the two phase medium under the dynamic loading is derived ,discard the method which is divided in two step, first calculating the dynamic response ,second calculating the static consolidation,or calculation pore water pressure by water pressure constitutive model.This program can analysis the initial stress , initial strain before earthquake ,the dynamical stress, the dynamical strain, the increase speed and the development of the generation ,dispersion and dissipation of pore water pressure, the residual displacement of the soil. Finally, the finite element programs is used for the dynamic consolidation analysis for the 3-D saturatedfree sand foundation calculation ,the result is compared with the result of test, the program is accuracy <,Form the results above, the method which established on the physics station constitutive model dynamic response can truly analysis the physics station of the during earthquake.