城市轨道交通地下线引起的环境振动影响因素研究

随着城市的发展,轨道交通在各大城市中得到迅速发展,但与之相伴的环境振动问题也日益突显.为研究城市轨道交通地下线列车运行速度、线路条件、减振措施等运营条件对环境振动影响,在某地铁线路隧道内进行了环境振动源强测试.结果表明,隧道壁源强位置处Z振级随着速度的增加而增大,列车通过速度在57～75 km/h变化时,列车速度每增加...

Study on Influencing Factors of Environmental Vibration Caused by Downline of Urban Rail Transit

With the development of cities,rail transit has developed rapidly in major cities,and the accompanying environmental vibration problem has become increasingly prominent.In order to study the influence of operating conditions such as running speed,line conditions and vibration reduction measures on the environmental vibration of underground trains of urban rail transit,the environmental vibration source intensity was tested in a subway line tunnel.The results show that with the increase of the speed,the Z-level vibration level at the source position on the tunnel wall increases.When the train passing speed changes from 57 km/h to 75 km/h,the vibration level increases about 2.4 dB for every 5 km/h increase of train speed.Line conditions and construction methods have obvious influence on the vibration of the tunnel wall of urban rail transit.Under the same speed condition,the vibration level of tunnel wall by shield construction method is low.Considering the influence of geological conditions,the vibration reduction effect of steel spring floating slab track is 22.9~23.9 dB,and that of rubber floating slab track is about 18.5~19.5 dB.The vibration reduction measures have obvious influence on the vibration of urban rail transit tunnel wall.