随着城市地铁线网的逐渐加密,地铁线路布局越发复杂多样,多条地铁线路近距离并行或交叠运行情况越来越多,由此产生的地铁环境振动影响也更为恶劣和复杂.建立多孔隧道不同列车运行状态下环境振动影响三维动力有限元模型,计算结果同相关标准规范中的经验公式预测结果进行对比,两者吻合较好,在此基础上系统分析隧道孔数、隧道空间位置关系及列车不同交汇情况对地表振动传播规律的影响.仿真结果表明:上部隧道孔洞对下部隧道地铁列车运行引起的地表振动传播规律影响较大,且对隧道孔洞近场地表振动具有一定的遮挡作用;上下隧道水平间距相比垂向间距影响更为显著;不同列车运行状态组合方式对地表振动影响差异较大.研究结论可为地铁环境振动影响评价、地铁线路设计等提供参考依据.%With the rapid development of subway construction, the distribution of subway tunnels is becoming more and more complex, such as parallel tunnels with close intervals, stacked tunnels and crossing tunnels. These subways can induce serious environment vibration. In this paper, 3D stacked tunnel models with different train operation conditions were built. The numerical calculation results were found to be in good agreement with those from the empirical formulae provided in some standards. On this basis, the influence of the number of the tunnel, the spatial positions of the tunnel and different train operation conditions on the environmental vibration was analyzed systematically. The simulation results show that the upper tunnel has a great influence on the propagation rules of the ground vibration induced by the lower tunnel in the train operation condition, and has a shelter effect to the near-field ground surface vibration of the tunnel. The horizontal spacing between the tunnels has greater influence than the vertical spacing between the tunnels. Different train operation combination has different effect on the ground vibration. These conclusions have provided some references for the assessment of subway environment vibration and subway design.
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