地面微倾斜可液化场地中地铁地下车站结构的地震反应研究  

Seismic response of subway underground station buried in liquefiable soil foundation with the ground surface slight inclined

作　　者：王瑞[1] 庄海洋[1] 陈国兴[1] 付继赛 WANG Rui;ZHUANG Haiyang;CHEN Guoxing;FU Jisai(Institute of Geotechnical Engineering, Nanjing Technology University, Nanjing 2100091, China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京2100091

出　　处：《地震工程与工程振动》2018年第2期130-140,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金面上项目(51778290;51778282);国家自然科学基金青年项目(51508526);江苏省高校自然科学基金重大项目(16KJA560001)~~

摘　　要：砂土液化造成了大量建筑物的破坏,但目前对砂土液化地基中地铁地下结构的地震反应研究相对较少,尤其对微倾斜液化地基中地铁地下结构地震反应的研究更为缺乏。基于有限单元法,采用已开发的砂土液化大变形动力本构模型模拟液化土层的剪切大变形,采用基于ALE(Arbitrary Lagrange-Euler)算法的有限单元网格动态自适应调整技术解决土体液化大变形发生后有限单元的畸变问题,建立了地面微倾斜液化地基中土体-地下结构非线性动力相互作用的数值分析模型,分析了地面倾角变化对地铁车站周围地基液化分布特征、车站结构周围土层侧移变形特征、地下结构上浮和应力反应的影响规律,揭示了微倾斜液化地基中地铁地下车站结构的地震反应特征。Sand liquefaction has induced many damages to the buildings. However,few studies have been done to investigate the seismic response of subway underground structure buried in liquefiable soil foundation,especially when it is buried in liquefiable soil foundation with the ground surface slight inclined. Accordingly,the shear deformation of liquefied sand was modeled by a special soil constructive model and the Arbitrary Lagrange-Euler method used to prevent the distorted soil elements. As a result,a soil-underground structure interaction model was made by finite element method. Based on the results,how the inclined angle affect the liquefaction condition of soil foundation,the lateral deformation and floating of subway underground structure,the seismic stress response of underground structure,were analyzed. The seismic responses rule of subway underground station buried in liquefiable soil foundation with the ground surface slight inclined was revealed.

关 键 词：地铁地下车站结构 砂土液化 土层侧移 地震反应 微倾斜场地 

分 类 号：TU441[建筑科学—岩土工程]