地铁列车引起的地面振动响应测试分析

Test and Analysis of Ground Vibration Response Caused by Subway Train

在深圳地铁1号线附近一振动敏感区进行了地面垂向振动测试,分析了南北列车单独通过和双线列车同时通过三种工况下地面振动响应规律。结果表明:地铁列车单线通过时地面垂向振动响应总体上随距隧道中线水平距离增加呈波动性下降趋势,地面振动垂向分频最大振级在距隧道中线水平距离4.5 m处最大;南线列车单独通过引起的振动经过北线隧道时,隧道结构对其振动响应有一定影响;在距北线隧道中线水平距离10 m处,双线列车同时通过时地面振动垂向分频最大振级比北线列车单独通过时增大7.8%。评估地铁对邻近敏感建筑物的影响时,建议考虑双线列车同时通过时振动叠加所造成的影响。

The ground vertical vibration test was conducted in a vibration sensitive area near Shenzhen Subway Line 1,and the ground vibration response law under three conditions when the north and south train passes alone and the doubleline trains pass at the same time was analyzed.The results show that the ground vertical vibration response caused by single-line subway train fluctuates and decreases with the increase of the horizontal distance from the center line of the tunnel as a whole.The maximum vibration level of vertical frequency division of ground vibration is the maximum at a horizontal distance of 4.5 m from the center line of the tunnel.When the vibration caused by the train passing alone on the south line passes through the tunnel on the north line,the tunnel structure has a certain influence on its vibration response.At a horizontal distance of 10 m from the center line of the north line tunnel,the maximum vibration level of vertical frequency division of ground vibration when the double-line trains pass simultaneously is 7.8%higher than that when the north line train passes alone.When evaluating the influence of subway on adjacent sensitive buildings,it is suggested to consider the influence of vibration superposition when double-line trains pass at the same time.