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以苏州地铁一号线的星海站为工程背景,考虑土与地铁车站结构非线性动力相互作用效应,分析了土与地下结构接触面的动力分离与滑移效应、土与地下结构接触面上动土压力和动摩擦力的分布规律与反应幅值,以及动力接触效应对地铁车站结构动力反应的影响规律。研究结果表明:强地震发生时,在地铁地下车站结构侧墙顶端,出现了土与结构接触分离现象,在车站结构顶底板处,土与结构产生了相对滑移现象;考虑动力接触效应时,地下结构总体动力反应是变小的。给出了车站结构侧墙上动土压力分布规律及其动土压力系数,以及车站结构顶底板上的动土压力分布规律及其反应幅值。研究结果对进一步了解土与地下结构的动力接触效应及其对地下结构动力反应的影响,具有一定的参考价值和指导意义。
Taking Xinghai station of Suzhou Metro Line 1 as an example, considering the nonlinear dynamic interaction between earth station and metro station, the dynamic separation and slippage of the contact surface between soil and underground structure are analyzed. Pressure and dynamic friction distribution and reaction amplitude, as well as the dynamic contact effect on the dynamic response of metro station structure. The results show that when strong earthquakes occur, the contact separation between soil and structure appears at the top of the side wall of metro underground station structure, and the relative slip between soil and structure occurs at the top and bottom of the station structure. Considering the dynamic contact effect, The overall dynamic response of underground structures is smaller. The distribution rules of earth pressure on the side wall of the station structure and the pressure coefficient of earth moving are given, as well as the law of dynamic earth pressure distribution and the reaction amplitude on the top and bottom of the station structure. The results of the study have some reference value and guiding significance for further understanding of the dynamic contact effect between soil and subsurface structure and its impact on the dynamic response of underground structures.