地震液化区分布范围对地面大位移的影响  

Influences of Liquefied Area on Large Ground Displacement

作　　者：刘汉龙[1] 高玉峰[1] 朱伟[1] 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2001年第5期1-6,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金资助项目 ( 5 980 90 0 4)

摘　　要：应用稳态强度理论和动力有效应力分析方法 ,对液化后地面大位移进行数值计算 ,以研究液化区分布范围对地面大位移的影响 .结果表明 :当液化区可动用的残余强度较大时 ,液化区范围变化对地面位移影响不大 ,亦即此时一般不发生地面大位移破坏 .当液化区可动用的残余强度较小时 ,随液化区范围增大 ,地面位移增大呈现三个阶段 :初始阶段 (小位移阶段 ) ,随液化区厚度增加位移缓慢地增加 ,在几个cm量级内变化 ;过渡阶段 ,随液化区厚度增加位移急剧增加 ,从几个cm量级快速增至m量级 ;稳定阶段 (大位移阶段 ) ,随液化区厚度增加位移缓慢增加 .当土体发生局部液化时 ,也能产生地面大位移破坏 ,但当局部液化区处于地下土层一定埋深时 。For the research of the influence of liquefied area on large ground displacement,the large ground displacement induced by seismic liquefaction is calculated by use of the theory of steady state strength and the analysis of dynamic FEM.When the available residual strength is large, there is no influence of liquefied area on ground displacement;when the available residual strength is small enough, there are three stages about the influence of liquefied area on large ground displacement:the first stage is of a small displacement of several centimeters;the second stage is the gradual stage with a rapid ground displacement increase from several centimeters to meters;the third stage is the steady increase stage of large ground displacement.When the foundation is partly liquefied, there is no influence of liquefied area on large ground displacement when the liquefied area is at a certain depth.

关 键 词：地震 液化区 分布范围 大位移 残余强度 

分 类 号：TU435[建筑科学—岩土工程]