基于广义塑性理论的土体液化分析方法  

Method of soil liquefaction analysis based on generalized plasticity theory

作　　者：牛志伟[1] 李同春[1] 李宏恩[2] 

机构地区：[1]河海大学水利水电学院,南京210098 [2]南京水利科学研究院,南京210024

出　　处：《水力发电学报》2012年第1期99-102,107,共5页Journal of Hydroelectric Engineering

基　　金：水利部公益项目边坡地震失稳机理与抗震安全度评价方法研究(201001035);河海大学自然科学基金(2009421811);中央高校基本科研业务费专项资金资助(2009B07314);江苏高校优势学科建设工程资助项目(水利工程)

摘　　要：土体本构模型和液化分析是进行土体动力反应分析的主要研究内容。将土体作为液固两相孔隙介质,考虑土体骨架与孔隙流体之间的动力相互作用,采用基于广义塑性理论的PZ模型来模拟土体,分析土体在地震动荷载作用下的响应。通过研究土体内孔隙水压力产生、消散过程及土体有效应力的变化过程来进行土体液化的判定,利用这种方法可以得到土体在地震荷载作用下的液化深度。Constitutive model and analysis of soil liquefaction are two major issues in the area of soil dynamic response analysis.In this work,soil response under seismic load was analyzed with a PZ model of the general plasticity theory.Soil is treated as solid-liquid two-phase porous media,and dynamic interaction between soil skeleton and pore fluid is considered.A criterion of soil liquefaction is established through a study of the generation and dissipation process of soil pore water pressure and the variations of effective soil stress.By this method,soil liquefaction depth under earthquake load can be obtained.

关 键 词：岩土力学 液化分析 动力分析 PZ模型 土体本构模型 

分 类 号：TV312[水利工程—水工结构工程]