倾斜地层地震液化和滑移的有限元分析  

Study on FEM to simulate slip and seismic liquefaction of slope-field by theory of two phased dynamics

作　　者：陈文化[1] 门福录[2] 

机构地区：[1]北方交通大学土木建筑学院,北京100044 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2002年第1期132-140,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金资助课题(项目批准号:50008001);地震工程与工程振动开放实验室资助课题

摘　　要：应用饱和多孔介质动力学分析倾斜地层的土壤动力非线性反应、液化和液化滑移问题，地下水位上的地层简化为单相介质层，饱和夹砂层看作是两相介质，水是可压缩的，采用双曲线非线性本构关系，考虑了砂土的剪胀性、刚度退化、滞回特性和上水相对运动等因素。基于土力学模型，建立了适用于分析非自由场地液化的动力方程组，基于是否考虑发生渗流问题，同时建立了两种离散形式：一种是以土骨架位移和水位移为未知量的矩阵方程，另一种是以土骨架位移、水位移和孔隙水压力为未知量的矩阵方程，初步分析了适用于多孔介质波动模拟的离散模型的人工边界问题，形成的方法将有助于问题的解决。Theory of two phased media dynamics is used to analyze the seismic liquefaction and slip and dynamical response of slope field, based on the model of soil mechanics and taking account of dynamical nonlinear constitutive relation, soil dilatancy, rigid degradation, hysteresis and relative motion of water and soil. In the same time, an artificial boundary condition is copied with simulating the wave propagation in pore medium. A set of equations of subsoil layers is built. The equations are discrete for two cases which can be used to analyze the problem of water permeation. Firstly a matrix equation with the displacement of soil skeleton and water displacement as variables is set up. Secondly, the matrix equation taking pore water pressure, displacement of soil skeleton and the displacement of water as variables is also set up. Two kinds of computer programs are established. A good tool is found to understand and deal with this problem.

关 键 词：倾斜地层 振动液化 水位移 孔隙水压力 两相介质动力学 数学模拟 散射场 边界条件 滑移 有限元分析 

分 类 号：TU435[建筑科学—岩土工程]