地铁振动衰减特性研究

Research on Attenuation Characteristics of Subway Vibration

摘要:

首先建立隧道土体有限元模型，分析了1~80 Hz的振动在距隧道中心170 m范围内振动速度和加速度的衰减特性.将轮轨动力耦合分析获得的不同地铁轨道作用在道床上的动荷载作为有限元分析模型中的作用力，计算分析了不同轨道结构地段的地表振动传播特性，结果表明：在50 m范围内浮置板减振效果明显，在50 m以上轨道减振形式对地面振动影响不明显.

Abstract:

At first， a finite element model of metro tunnelsoil is built.The attenuation characteristics of the vibration velocity and acceleration within 170 meters away from tunnel center are analysed.Based on the wheelrail dynamic coupling analysis,the dynamic force loaded on the track bed by different subway tracks is gained which is used in the finite element model.The vibration propagation characteristics on the earth’s surface around the different tracks are calculated and analysed.The results show that within 50 meters,vibration reduction effect of floating slab track is obvious; out of 50 meters,track type has little influence on the vibration.