地铁列车运行诱发地面邻近建筑振动的数值模拟研究

为研究城市地铁运行产生的振动波在地面邻近建筑物中的传播规律，以地铁沿线邻近建筑为研究对象，参数取值参考实际工程量值范围，建立地铁列车-轨道-隧道-地层-建筑物整体有限元数值模型，重点研究地面邻近建筑中同楼层和不同楼层间振动响应的传递分布规律和频谱特性。结果表明：地铁运行对建筑的振动激励以中低频1~50 Hz为主；房间面积越大，楼板自振频率位于激励荷载优势频段范围越多，越易引起楼板共振；楼板跨中点的振动强度通常大于边角点的振动强度，角点的振动会在低频段1.25~2.0 Hz超过楼板跨中点；随着楼层的升高，三向振动加速度响应均呈波动性变化。通过多工况的计算，分析了运行车速、隧道埋深和振中距对邻近地铁建筑物振动响应的影响规律。

Numerical study on vibration of ground building adjacent to metro induced by operation of subway train

In order to study the propagation pattern of vibration wave generated by urban subway operation in buildings adjacent to the metro and provide guidance for engineering practice, this paper takes adjacent buildings along the subway line as the research object and refer to the range of actual quantities to establish the general finite element numerical model of subway train-rail-tunnel-ground-building system. The transmission distribution and spectral characteristics of vibration response of the same floor and different floors in the building are studied. The results show that the vibration excitation of the building caused by subway operation is mainly in the range of 1~50 Hz; The greater the room area, the more the natural vibration frequencies of the floor are located in the dominant frequency range of the excitation load, and the more prone it is to cause floor resonance; The vibration intensity of floor span midpoint is usually greater than that of corner point, and the vibration of corner point will exceed floor span midpoint in low frequency band of 1.25~2.0 Hz; The vibration acceleration response in three directions presents a fluctuating distribution trend with the rise of the floor. Through the calculation of several examples, the influential characteristics of running speed, tunnel burial depth and horizontal distance between building and tunnel are analyzed.