地铁列车荷载作用下Duxseal-WIB隔振性能数值分析

城市轨道交通快速便捷的同时,地铁运行产生的环境振动问题也日益突出。Duxseal作为一种工业填料,具有良好的阻尼性能并能吸收振动反射能,将其运用到地铁隔振中,提出一种带孔波阻板填充Duxseal(DXWIB)的隔振方法。通过建立三维ABAQUS有限元模型,对比分析波阻板(WIB)、蜂窝状波阻板(HWIB)和DXWIB的隔振效果,讨论DXWIB埋置深度及厚度对隔振效果的影响,并分析基床表层和地面的振动规律。计算结果表明:DXWIB的隔振效果最优,而WIB与HWIB的隔振效果相近;DXWIB在埋深0.5 m厚度0.8 m时隔振效果最佳;基床表层的振动规律表现为由振源向两侧横向传播中,加速度整体呈衰减趋势,而在地面传播过程中,加速度峰值呈先增大后减小再增大的趋势,在距轨道中轴线20 m和50 m处出现局部放大效应。

Numerical analysis on the vibration isolation performance of Duxseal-WIB under subway train loading

With the fast and convenient development of urban rail transit, the environmental vibration caused by subway operation is increasingly prominent. As an industrial filler, Duxseal has good damping performance and can absorb vibration reflection energy. In this paper, it was applied to subway vibration isolation, and a vibration isolation method of Duxseal filled by WIB (wave impeding block) with cylindrical holes (DXWIB) was proposed. Through a three-dimensional ABAQUS finite element model, the vibration isolation effects of WIB, honeycomb WIB (HWIB), and DXWIB were compared and analyzed. The influences of the depth and the thickness of DXWIB on the vibration isolation effect were discussed, and the vibration laws of the subgrade surface and the ground were analyzed. The results showed that the vibration isolation effect of DXWIB is the best, while those of WIB and DXWIB are similar. DXWIB has the best vibration isolation effect when the buried depth is 0.5 m and the thickness is 0.8 m. The vibration law of the subgrade surface is that the vibration source propagates laterally to both sides, and the acceleration shows an attenuation trend. In the process of ground propagation, the peak acceleration increases first, then decreases, and finally increases, and local amplification effect appears at 20 m and 50 m away from the track axis.