防水措施对堤坝地震液化影响的数值分析  

Numerical analysis of effect of waterproof measures on earthquake induced liquefaction of embankment

作　　者：夏志凡[1,2] 叶冠林[1] 王建华[1] 叶斌 张锋[4] 

机构地区：[1]上海交通大学土木工程系,上海200030 [2]南昌工程学院,南昌330099 [3]日本地域地盘环境研究所 [4]日本名古屋工业大学

出　　处：《岩土力学》2010年第8期2682-2688,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.50679041;No.50969007);上海市重点学科建设项目(No.B208);上海市浦江人才计划项目(No.08PJ1406600);江西省教育厅科技项目(No.GJJ09367)

摘　　要：通过基于有效应力的完全耦合动力分析方法,研究了混凝土面板坝在地震作用下的动力响应,详细地讨论了堤坝迎水面斜坡上铺设的防水毯对堤坝地震液化的影响。计算中土体采用Cyclic mobility本构模型,该模型通过在修正剑桥模型上增加应力诱导各向异性、超固结和结构性的概念及其相关发展准则,可以很好地描述可液化土体的动力特性。计算结果表明防水毯的存在可以有效降低坝体的地下水位浸润线,增加坝基的初始有效应力,从而降低坝基地震液化发生的可能性,同时坝体的变形明显减小。The earthquake induced liquefaction of embankment is analyzed using the effective-stress based fully coupled dynamic analysis method.Special emphasis is given to discuss the effect of waterproof carpet paved on the slope of the upstream.The behaviors of the foundation soils are described by means of a cyclic mobility constitutive model which was developed at the bases of modified Cam model by introducing concepts such as stress-induced anisotropy,over-consolidation,and structure.Results show that the phreatic line become lower due to the effect of the waterproof carpet,which increases the initial effective stress of dam foundation and reduces the possibility of liquefaction.Furthermore,the deformation is reduced effectively.

关 键 词：地震液化 交变移动性 完全耦合分析法 混凝土面板坝 

分 类 号：TU024.1[建筑科学]