Prediction of building vibration induced by metro trains running in a curved tunnel
Prediction of building vibration induced by metro trains running in a curved tunnel
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DOI：
10.1177/1077546320930910
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发表时间：
2020-05-22
影响因子：
2.8
通讯作者：
Tan, Xinyu
中科院分区：
文献类型：
--
作者：
Ma, Meng;Xu, Lihui;Tan, Xinyu
目前，弯曲的地铁线路占总线路里程的很大比例。然而，现有的环境振动预测模型只考虑了列车在直线隧道中运行时产生的振动。本文建立了列车在弯曲隧道中运行时产生的环境振动的数值模型。该模型分为两部分：列车-轨道耦合模型和隧道-地基-建筑有限元模型。第一部分基于周期理论，建立了一种新颖的三维列车-曲线轨道耦合模型，并在频域上进行了求解。利用该模型计算了列车的垂直和水平载荷。然后，对某营运地铁曲线隧道进行了现场实测，得到了隧道的振动响应，并用于列车轨道模型的标定。最后，以北京地铁16号线为例进行了案例研究，该案例需要预测和评估在办公楼下面规划建设的弯曲地铁线路的振动对环境的影响。建立了三维隧道-地基-建筑物有限元模型，并对建筑物在垂直和水平方向上的振动进行了预测。结果表明：楼板振动峰值分别为5.29 Hz和27.8 Hz，且楼板局部模态和钢轨间距加重了楼板振动峰值；三楼以下竖向振动响应超过中国国家标准推荐的振动控制限值。轨道振动控制方案必须实施，以减轻环境振动。
Curved metro lines currently account for a significant proportion of total route mileage. However, the existing prediction model of environmental vibration only considered the vibration induced by trains running in a straight tunnel. In the present study, a numerical model was proposed to predict the environmental vibration induced by trains running in a curved tunnel. The model was divided into two parts: a train-track coupled model and a tunnel-soil-building finite element model. In the first part, a novel three-dimensional train-curved track coupled model was established and solved in the frequency domain based on the periodic theory. Both vertical and horizontal train loads were calculated by this model. Then, an in situ measurement was performed in the curved tunnel of an operating metro line, and the tunnel vibration responses were obtained and used to calibrate the train-track model. Finally, a case study was selected from Beijing metro line 16, where it is needed to predict and evaluate the environmental impact of vibration from a curved metro line being planned for construction beneath an office building. A three-dimensional tunnel-soil-building finite element model was built, and the building vibrations in vertical and horizontal directions were predicted. The results show that the floor vibrations have peak values of approximately 5.29 and 27.8 Hz, which are exacerbated by the building local mode and the spacing of the rail supports. Below the third floor, the vertical vibration response exceeded the vibration control limit recommended by Chinese national standards. Track solutions for vibration control must be implemented to mitigate the environmental vibrations.