地铁列车在隧道运行时引起的环境振动影响分析

Analysis of Environmental Vibration Impact Induced by Metro Train Running in Tunnels

  • 摘要: 为了研究运用浮置板轨道结构后列车在隧道中运行时对浮置板、基底、隧道壁、地面以及上部建筑的振动响应变化,建立了车辆-钢弹簧浮置板轨道-土体-建筑物耦合振动模型,计算分析了车辆运行在不同轨道结构和不同车速下,引起浮置板、隧道壁、地面和建筑物振动加速度特性与振级特性。当采用钢弹簧浮置板轨道结构时,车辆引起隧道正上方地面和楼层的Z振级最大值均小于70 dB,能够满足环评标准;当隧道埋深大于11 m时,地面正上方和楼层Z振级均未超过70 dB,满足环评居民、文教区要求。对比整体道床和钢弹簧浮置板轨道结构的楼层振动加速度Z振级可知,钢弹簧浮置板结构减振效果优于整体道床。该研究方法可对未来其他轨道交通线路减振降噪轨道设计甚至其他城市的轨道交通沿线敏感点减振降噪提供重要参考。

     

    Abstract: In order to study the changes in the vibration response of the train to the floating slab, the base, the tunnel wall, the ground and the superstructure when the floating slab track structure is used in the tunnel.The coupling vibration model of vehicle-steel spring floating plate track-soil-building was established, and the vibration acceleration characteristics and vibration level characteristics of the floating plate, tunnel wall, ground and building caused by the vehicle running under different track structures and different vehicle speeds were calculated and analyzed.When the steel spring floating plate track structure is adopted, the maximum Z vibration level of the ground and floor directly above the tunnel caused by the vehicle is less than 70 dB,which can meet the EIA standard.When the buried depth of the tunnel is greater than 11 meters, the vibration level directly above the ground and the floor does not exceed 70 dB,which meets the requirements of the EIA residents and the cultural and educational district.Comparing the floor vibration acceleration Z level of the integral track bed and the steel spring floating plate track structure, it can be seen that the vibration damping effect of the steel spring floating plate structure is better than that of the overall track bed.The research method proposed in this paper can provide an important reference for the future design of vibration and noise reduction tracks of other rail transit lines and even the vibration and noise reduction of sensitive points along rail transit lines in other cities.

     

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