列车荷载下竖向非均匀地基波阻板主动隔振分析

Active vibration isolation using WIB in non-uniform ground under train loadings

对列车模型简化计算,基于薄层法研究波传播问题高效性与边界元法处理无限域问题精确性,建立薄层法基本解答作为格林函数边界元法。针对三维竖向非均匀地基模型,对WIB主动隔振体系进行参数研究。结果表明,在轨道交通荷载作用下,增加WIB剪切模量、厚度、宽度及选较小埋深均可增大WIB隔振体系隔振效果;非均匀系数对隔振效果略有影响。

Thin-layered method （TLM） is very efficient to study the wave propagation in layered ground, and boundary element method （BEM） is very precise to solve infinite domain problems. Here, the track-ground substructure model was simplified. Then, combining the advantages of the above two methods, a 3D semi-analytical BEM based on TLM was presented, with a Green＇s function taken as a fundamental solution of a stratified half-space. Due to the vertical inhomogeneous ground, the effects of geometric and material properties of WIB were investigated in detail and the results showed that increasing the shear modulus, thickness and width of WIB can improve the isolation effect under rail transit load; at the same time, relatively small embedment depth can give a satisfactory isolation effect; in addition, the foundation of the stratification parameter and the characteristics of non-uniform have a little influence on the vibration isolation effect of WIB.