有建筑物存在的软土地基液化模拟地震振动台试验研究  

Shaking table testing on seismic liquefaction of soft soil under building footing

作　　者：陈跃庆[1] 吕西林[1] 侯建国[2] 李大庆[2] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2003年第1期59-63,85,共6页Engineering Journal of Wuhan University

基　　金：国家自然科学基金重点项目资助 (5982 3 0 0 2 ).

摘　　要：在进行结构-地基动力相互作用体系振动台模型试验中,再现了地震动激励下有建筑物存在的砂质粉土软土地基的液化现象.通过对试验实测资料的分析,研究了模拟地震激励下土中孔隙水压力的变化规律.随振动激励次数的增加,土中超孔隙水压力增大;其变化与测点深度、距基础中心线的远近、土的性质、地震激励的频谱组成等有关.震后孔隙水压力不一定随振动的停止而立即开始消散,在短期内也可能继续增长.The liquefaction phenomena of sandy powder soil under building footing are reproduced with shaking table tests on dynamic soil_structure interaction. Based on these tests, the issues of the development of excess pore water pressure in soft soil under simulated earthquake excitations are investigated. Excess pore water pressure in soil increases with the increasing of excitations. And variation of excess pore water pressure is related to the situation of measuring point, soil characteristics, the spectral characteristics of seismic excitation, and so on. Excess pore water pressure does not always dissipate in short time immediately after the excitations, but it may keep on increasing too.

关 键 词：建筑物 软土地基 孔隙水压力 砂质粉土 液化 振动台试验 

分 类 号：TU471.8[建筑科学—结构工程]