地铁浮置板轨道区段的车致环境振动特性分析

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中图分类号：TB535.1;TB115.1 文献标志码：B

Abstract： To investigate the train-induced environmental vibration characteristics and transmission laws of the steel spring floating slab track section，a train-track coupling dynamic model is built to analyze the vibration source characteristics of the steel spring floating slab track section，and a 3D finite element model of the track-tunnel-soil-building coupling is built to analyze the transmisson laws of the traininduced environmental vibration caused by the steel spring floating slab track，and the effctiveness of the model is verified based on on-site measurement results.The effects of different tunnel burial depths and avoidance distances on ground and building environmental vibrations is simulated and calculated，and the analysis results show that：at a point 1O m from the centerline of the metro tunnel，the maximum vertical vibration acceleration obtained from the simulation is 0.0045g while the measured result is 0.0042g ， and the simulation results are consistent with the measurement results；the vibration intensity of buildings induced by metro train is strongly correlated with the horizontal avoidance distance from the metro，and is also related to the building's own structure； the tunnel burial depth has a significant influence on both floor and ground vibrations.As the tunnel burial depth increases，the vibration acceleration Z -vibration level decreases significantly，demonstrating that a greater tunnel burial depth is beneficial for controlling environmental vibrations.

Key words：metro；vehicle；floating slab track；vibration-reduction；environmental vibration； Z-vibration level； tunnel burial depth； finite element

0 引言

城市轨道交通列车运行引起的振动和噪声，影响线路周边居住环境，因此通常采用减振轨道结构控制车致环境振动，浮置板轨道是有效控制车致环境振动与二次噪声的主要措施之一。（剩余6397字）