不同隧道介质下地铁列车运行引起地表的振动响应研究  

Research into the Ground Vibration Response Induced by Metro Trains in Different-Tunnel-Media Environments

作　　者：王黎明[1] 高云锋[1] 刘秀波[2] 岳渠德[3] 

机构地区：[1]青岛四方车辆研究所有限公司,山东青岛266112 [2]中国铁道科学研究院,北京100081 [3]青岛理工大学土木工程学院,山东青岛266033

出　　处：《国防交通工程与技术》2016年第2期13-18,共6页Traffic Engineering and Technology for National Defence

摘　　要：通过选取具有代表性的地铁隧道土层和岩层介质环境,利用有限元软件ANSYS建立隧道—地层有限元模型,基于相同隧道埋深下,施加相同的轮轨激励,研究地铁列车通过不同隧道岩土介质环境时引起的地表振动响应。结果表明：土层地铁,低频（≤8Hz）衰减不明显,高频（〉80 Hz）开始衰减较快;岩层地铁,在低频（≤8Hz）和高频（〉100Hz）衰减均较快,衰减幅度大于土层地铁,但中高频能量带宽却大于土层地铁;不同隧道介质下地表振动响应一般均出现4个峰值,其中10～20Hz出现振动放大区,尤其是在12.5Hz左右。距隧道中心50m范围内,岩层地铁与土层地铁的地表振动响应相差不大,大于该距离后,岩层地铁低频振动（≤8Hz）衰减较快,中高频（≥20Hz）衰减较慢,土层地铁则相反。8Hz以内,岩层地铁中振动衰减量大于土层地铁,且随频率增大,岩层地铁与土层地铁振动衰减差异有减小趋势;在10～12.5 Hz,振动波在土层地铁中衰减量开始大于在岩层地铁,且二者衰减量随距隧道中心的远近影响不大。可为地铁减振及设计研究工作提供一定的参考。By choosing a typical subway tunnel in rock or soil media environments,a tunnel-ground finite element model is established with the software of the ANSYS.With the same tunnel depth chosen and the same wheel-rail loads applied,the ground vibration response induced is studied in the paper.The result shows that with the low frequency（less than or equal to 8Hz）the vibration attenuation is not obvious in the soil-stratum Metro（tunnel in the soil environment）,but with the high frequency of80 Hz or more the vibration attenuation begins to decay comparatively rapidly;with both the low frequency（≤8 Hz）and the high frequency of 100 Hz or more the vibration attenuation decays rapidly in the rock-stratum Metro（tunnel in the rock environment）,the decaying magnitude being greater than that in the soil-stratum Metro,but the bandwidth of the medium-high frequency energy is wider than that in the soil-stratum Metro;4peak values of the ground response occur in all the different media environments,while a enlarged vibration area exits between 10 Hz and 20 Hz,especially with about 12.5Hz;within 50 mfrom the center of the tunnel,the ground vibration response is almost the same in both the soil-stratum Metro and the rock-stratum Metro,beyond the distance,the low-frequency vibration decreases rapidly,and the medium-high-frequency of 20 Hz or more the vibration attenuation decreases comparatively slowly.And the case of the soil-stratum Metro is just the opposite;within 8Hz,the decaying amount of the vibration attenuation is greater in the rock-stratum Metro,and the difference of that between the soilstratum Metro and the rock-stratum Metro decreases with the frequency increasing;and the difference in the decaying of the vibration between the soil-stratum Metro and the rock-stratum Metro has a tendency of decreasing;at 10～12.5Hz,the decaying amount of the vibration wave in the soil-stratum Metro is greater than that in the rock-stratum Metro,while the distance from the centre has little effect on the vibration attenua

关 键 词：地铁振动 动力有限元 人工边界 1/3倍频 振动加速度级 

分 类 号：U231[交通运输工程—道路与铁道工程] TB533.2[理学—物理]