强震下饱和软粘土残余变形理论与试验研究  

Residual deformation theory and test study on saturated soft clay under action of strong earthguake

作　　者：王军[1] 吴延平 蔡袁强[1] 

机构地区：[1]温州大学建筑与土木工程学院,浙江温州325027 [2]温州市城建设计院,浙江温州325000

出　　处：《自然灾害学报》2009年第3期25-31,共7页Journal of Natural Disasters

基　　金：国家自然科学基金资助项目(50808145,50778136);浙江省自然科学基金杰出青年团队项目(R1080819);温州市科技计划项目(S20080016,S20080046);浙江省建设厅科研项目(08Z027);浙江省高校优秀青年教师资助计划项目

摘　　要：通过对杭州饱和软粘土进行双向激振循环三轴试验研究了强震作用下饱和软粘土的变形特性。重点分析了循环应力比、径向循环应力比与初始剪应力等因素对双向激振下饱和软粘土残余应变与软化指数之间关系的影响。通过引入综合影响参数对试验数据进行归一化,建立了双向激振下饱和软粘土残余应变模型。通过将该模型引入到修正的Iwan模型中对双向激振下饱和软粘土的应力-应变关系进行了描述,得到了与实测值比较吻合的结果,证明了所提残余应变模型的合理性。The cyclic deformation behavior of Hangzhou soft clay under strong tional cyclic triaxial tests. The effects of cyclic stress ratio, radial cyclic stress earthquake was studied by bidirecratio and initial shear stress on the relationship between residual strain and degradation index were investigated. An empirical residual strain model for bidirectional cyclic loading was proposed by introducing comprehensive impact parameter. The model was further introduced into modified Iwan model to simulate the stress - strain relationship of soft clay. The comparison of simulation results with test data proves the proposed model is correct.

关 键 词：应变软化 循环荷载 残余应变 初始剪应力 

分 类 号：O319.56[理学—一般力学与力学基础]