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以北京地铁6号线新华大街站公共区Y型柱地铁车站为工程背景,利用FLAC3D有限差分程序数值模拟分析,研究超浅埋大跨度、高断面、Y形柱地铁车站结构分别在仅输入水平向地震动和同时输入水平向与竖向地震动情况下的地震响应特性。结果表明:(1)与仅输入单向地震动相比,双向地震动耦合作用下车站各测点的峰值加速度和应力值均增大,而相对水平位移减小,且随着输入地震动强度的增加,竖向地震动影响率呈递减趋势;(2)双向地震动作用下,同一工况Y形柱叉支处各测点的竖向位移明显增大,且各测点的竖向位移值较为均匀,而单向水平地震动作用下各测点竖向位移差异较大;(3)与单向水平地震动相比,竖向地震动的输入对各测点间的水平方向地震动特性规律影响较小。
Based on the Y-shaped column metro station in the public area of Xinhua Street Station on the 6th line of Beijing Subway, the numerical simulation of FLAC3D finite difference program is used to study the structure of metro station with ultra-shallow buried large span, high section and Y- Seismic response to ground motion and simultaneous input of horizontal and vertical earthquakes. The results show that: (1) Compared with the one-way ground motions, the peak accelerations and stress values at all stations under two-way ground motions are increased and the relative horizontal displacements decrease, and with the input ground motions (2) Under the action of bidirectional ground motions, the vertical displacements of each measuring point of Y-shaped branch fork in the same working condition obviously increase, and the vertical displacements of each measuring point (3) Compared with unidirectional horizontal ground motions, the input of vertical ground motions has no significant influence on the horizontal ground motions Characteristics of the law less affected.