可液化地基中地铁车站周围场地地震反应分析

地基液化是地铁车站结构在地震中发生严重震害的重要威胁之一。基于对砂土液化大变形本构模型的研究，建立了可液化地基–地铁车站结构非线性静动力耦合相互作用分析模型，分析了该相互作用体系的地震反应规律。首先，对地铁车站结构周围地基的动孔隙水压力、位移和加速度的时空分布规律进行了分析，重点分析了可液化地基上车站结构上浮、周围侧向地基地表的地震沉降、车站结构周围地基的液化区分布特性及其位移矢量场特征；其次，对车站结构周围可液化地基的地震反应对地面结构的地基稳定性及其所处地震环境的影响进行了初步研究，研究成果可对控制可液化地基上地铁车站结构地基的震害及其对地面结构造成的震害影响提供科学依据和参考。

Seismic responses of surrounding site of subway station in liquefiable foundation

The liquefiable foundation of the subway station may bring severe seismic damages to it.Accordingly,a nonlinear model for the liquefiable foundation-subway station interaction is constituted to calculate the large liquefaction deformation by using the constitutive model for sand.The space-time transformation of the dynamic pore pressure,the displacement and the acceleration of the liquefiable foundation are analyzed.The ascent of the subway station and the dynamic settlement of the side foundation are investigated.The distributions of liquefaction area and the displacement vectors of the foundation around the subway station are analyzed.The research findings can be helpful for analyzing the earthquake damages of liquefiable foundation around the underground structures or the ground structures.