二维非均匀饱和土体的地震反应分析

Analysis of Nonhomogeneous Fluid-saturated Soil in Two Dimensions Under Earthquake Load

将饱和土体视为由弹性骨架和不可压缩流体组成的两相孔隙介质，取固相位移、液相位移、孔隙水压力为场变量。从两相孔隙介质的动力耦合微分方程出发，利用伽辽金原理和Ｗｉｌｓｏｎ法导出了三场有限元积分方法。该方法可进行二维非均匀饱和土体的地震反应分析。文中通过算例讨论了非均匀饱和土体地震反应的一些特征。

In this paper, the saturated soil is modelled as a two-phase porous media systemconsisting of an elastic solid and an incompressible fluid phase . This approach uses the soliddisplacement, the fluid displacement and the pore pressure as the fluid variables. Based on thetwo -phase coupled differential equations of motion, the application of Galerkin' s principleand Wilson- method yields a three-field finite element integration procedure. The procedurecan be used to analyse the seismic response of the nonhomogeneous fluid- saturated soil in twodimensions. In the paper, some characters of the nonhomogeneous saturated soil underearthquake load is discussed through a sample calculation.