西安地铁2号线永宁门区段列车运行振动对其上部文物影响实测分析

在西安地铁2号线永宁门区段进行振动监测。通过振动实测结果,分析地铁列车单独运行时在不同运行速度工况下的地铁隧道、永宁门城墙、永宁门城楼的振动响应。结果表明:与普通轨道相比,钢弹簧浮置板道床的隧道壁水平向振动加速度幅值能减小45.1%,隧道壁垂直向振动加速度幅值能减小29.2%;永宁门城墙水平向、垂直向最大振动速度均为0.035 mm/s,永宁门城楼水平向、垂直向最大振动速度分别为0.083 mm/s和0.047 mm/s,均满足相关标准限值和国家文物局的建议值要求;地铁列车运行速度变化对其上部文物振动速度有一定的影响,但影响较小。

Measurement Analysis of Metro Train Vibra-tion Influence on the Cultural Relics above Yongning Gate Section of Xi'an Metro Line 2

A vibration monitoring in Yongning Gate section on Xi′an Metro Line 2 is conducted.On this basis,the vibration responses of metro tunnel,Yongning Gate Wall and Yongning Gate Tower are analyzed,which are under different operating speed conditions when the metro train is running alone.The results show that compared with ordinary track,the horizontal vibration acceleration amplitude of the tunnel wall is reduced by 45.1%,the vertical vibration acceleration amplitude of the tunnel wall is reduced by 29.2%.The maximum horizontal and vertical vibration velocities along the direction of Yongning Gate Wall are 0.035 mm/s,while the maximum horizontal and vertical vibration velocities of Yongning Gate Tower are 0.083 mm/s and 0,47 mm/s respectively,all meet the requirements of relevant standard limits and the recommended values of the State Cultural Relics Bureau.The variation of metro train running speed has some influence on the vibration velocities of the upper cultural relics,but the impact is not strong.