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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。
Liquid foundation liquefaction is one of the most important threats to the subway station structure in the earthquake. Based on the research on the large deformation liquefaction constitutive model of sand soil, a nonlinear static-dynamic coupling interaction analysis model of liquefiable ground-metro station is established, and the seismic response law of the interaction system is analyzed. Firstly, the spatial and temporal distribution of dynamic pore water pressure, displacement and acceleration of subgrade around metro station structure are analyzed. The structure of floating station on the liquefiable ground, seismic settlement of lateral subsoil surface around the station, ground around the station structure The distribution characteristics of the liquefaction zone and the characteristics of the displacement vector field are also discussed. Secondly, the seismic response of the liquefiable ground around the station structure is studied preliminarily on the stability of the ground structure and the seismic environment in which the ground structure is located. The earthquake damage of metro station structure foundation on liquefied ground and its impact on ground structure caused by earthquake damage provide scientific basis and reference.