地鐵浮置板軌道區(qū)段的車致環(huán)境振動特性分析

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中圖分類號：TB535.1;TB115.1 文獻標志碼：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

城市軌道交通列車運行引起的振動和噪聲，影響線路周邊居住環(huán)境，因此通常采用減振軌道結構控制車致環(huán)境振動，浮置板軌道是有效控制車致環(huán)境振動與二次噪聲的主要措施之一。（剩余6397字）