可液化土层中地下结构上浮及其控制措施  

The floating of underground structure in liquefiable soil layer and its control measures

作　　者：王文章 廖晨聪 周香莲[1] 张中杰 张擎宇 WANG Wenzhang;LIAO Chencong;ZHOU Xianglian;ZHANG Zhongjie;ZHANG Qingyu(School Naval Architecture,Ocean & Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Urban Construction Design& Research Institute,Shanghai 200125,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《地震工程与工程振动》2019年第3期159-167,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51678360)~~

摘　　要：地震荷载引起的饱和土体液化会导致地下结构上浮,利用一种水-土耦合本构,对液化土层中地下结构上浮及其控制措施展开研究。建立了有限元模型,模拟得到不同地震强度作用下模型加速度、超孔压(比)、上浮位移等结果,模拟并分析采取不同地基处理措施对结构上浮的控制作用。结果表明该本构能模拟可液化土层中地下结构动力响应,随着地震强度的增大,土体液化深度会发展;地下结构上浮分别由土体液化和土体振动引起,且前者是造成结构破坏的主要原因;抗拔桩法、倒滤层减压法以及换填法均可改善地下结构上浮情况,其中换填法和抗拔桩法控制上浮效果较好。The liquefaction of saturated soil caused by seismic loads will cause the underground structure to float.A water-soil coupling constitutive is used to study the uplift of underground structures in the liquefied soil layer and its control measures.The finite element model is established to simulate the results of model acceleration,excess pore pressure (ratio) and floating displacement under different seismic intensities.The effects of different ground treatment measures on structural floating are simulated and analyzed.The results show that the constitutive model can simulate the dynamic response of underground structures in liquefiable soil layers.With the increase of seismic intensity,the liquefaction depth of soil will develop.The uplift of underground structures is caused by soil liquefaction and soil vibration,and the former is the main reason for structural damage.The uplift pile method,the decompression method and the replacement method can all improve the floating of the underground structure.Among them,the replacement method and the uplift pile method have better control effect.

关 键 词：地震液化 地下结构 数值分析 超孔压比 上浮 

分 类 号：TU4[建筑科学—土工工程]