地铁车辆段不同区域车致上盖建筑振动传播规律研究

Train-induced Vibration Transmission within Over-track Buildings in Different Areas of Metro Depot

由于线路条件和行车速度的不同,地铁车辆段盖下不同功能区振源特性差异很大。对深圳某地铁车辆段进行现场实测,获得地铁列车在咽喉区及其在不同车速下在试车线运行所致振动在地面及上盖建筑中的传播规律,并对其环境振动影响进行评价。研究表明:在盖下不同区域地铁列车激励所引起同一建筑物的振动峰值所在频率不同,在试车线与咽喉区列车运行引起的振动峰值分别出现在63 Hz~80 Hz和31.5 Hz~40 Hz。场地土与上盖建筑物的振动耦合特性与振动频率相关,在较低频段4 Hz~25 Hz表现出整体振动特性,在中频段25 Hz~50 Hz振动出现一定程度放大,在63 Hz以上的中高频段中存在耦合损失。在地铁列车在试车线和咽喉区运行所引起的上盖建筑振动主要频率范围内,振动随着层高增加先减小再放大。研究成果可为地铁车辆段在不同区域振动控制提供参考。

The characteristics of vibration sources in different functional areas of metro depot vary greatly due to the different track conditions and train speeds.Based on the field measurement of a metro depot in Shenzhen,the vibration propagation law of the ground and the over-track building caused by the train operation at test line with different speeds and in the throat area was obtained.The environmental vibration impact was evaluated.The results show that the frequencies of the peak vibration of the same building are different due to the excitation of different vibration sources.The frequencies of the peak vibration generated by the train at the test line and throat area are 63 Hz-80 Hz and 31.5 Hz-40 Hz,respectively.The coupling characteristics of the vibration propagation from the soil to the over-track building are related to the vibration frequency.Namely the vibration characteristic of whole structure appears in the lower frequency band of 4 Hz-25 Hz,there is a certain degree of amplification in the middle frequency band of 25 Hz-50 Hz and the coupling loss is observed above63 Hz.In the main frequency range of the over-track building vibrations caused by the test line and the throat area,the vibration decreases first and then magnifies with the increase of the building height.The research results can provide a reference for vibration control in different areas of metro depot.