In Situ Experiment and Analysis of Environmental Vibration Induced by Urban Subway Transit
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摘要: 对某地铁3处典型路段的地铁运营诱发振动进行了实测,分析了其特点和衰减规律,得到了如下一些结果:地铁运营诱发振动的60-80 Hz分量较大,传到建筑物的振动以20 Hz以内的低频振动为主;垂直分量较水平方向衰减慢,且垂直分量振动幅度显著高于水平分量;不同地质条件对地铁运营诱发振动的传播影响较大;离开隧道轴线一定距离存在一个振动放大区,此距离与地层条件、隧道埋深和振源机制有关.本文实测条件下,这一距离为20-30 m;振动放大区能量主要集中在10 Hz以内,高频振动分量总的趋势是随距离的增大而衰减,但某些高频振动分量在某些地质条件下同样会出现反弹情况.最后根据实测数据提出了预测地铁运营引起环境振动的统计回归公式,可为预测或估计地铁运营诱发的环境振动以及地面建筑的防振减振控制提供参考.Abstract: This article carried out vibration tests on three typical road sections along a subway, and analyzed the regulation of vibration attenuation. The conclusion is that the 60-80 Hz weight of environmental vibration of subway is stronger than other weight, and the weight transmitted to structures is mainly dominated by frequency below 20 Hz; the vibration in vertical weight attenuates more slowly than in horizontal weight, and the amplitude in vertical weight is higher than in horizontal weight; there exists a vibration amplifying zone in a certain distance to subway track, which is determined by the geological condition, the depth of the tunnel and mechanism of vibration. In this paper, the distance is 20~30 m away subway track; the energy were mainly within 10 Hz in the vibration amplifying zone, and high frequency vibration weight could attenuate with the increase of distance, although some could magnify under certain geological conditions. Finally, the attenuation empirical formula was given to predict subway environmental vibration, which could be used for reference in vibration control and buffer design of the ground structure.
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Keywords:
- vibrations /
- propagation /
- attenuation
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