水平-摇摆耦合振动波阻板主动隔振三维分析

3D analysis of active vibration isolation by wave impeding block under horizontal-rocking coupled loading

为研究三维地基中波阻板(简称WIB)的隔振效果,建立了以薄层法基本解答作为格林函数的半解析边界单元法。对水平-摇摆耦合激振作用下WIB隔振系统的主动隔振进行了计算,详细分析了WIB参数对隔振效果的影响。研究表明,WIB可以有效地隔振;增加WIB的厚度、提高WIB的弹性模量、减小WIB的埋深可以有效提高隔振效果,而增加WIB的直径可以显著降低WIB范围内地表位移振幅,但对WIB范围外的地表位移影响较为复杂。

The ground vibration isolation efficiency by wave impeding block （WlB） in a three-dimensional （3D） context is studied. The analysis is accomplished with the aid of a 3D semi-analytical boundary element method （BEM） based on thin-layered method （TLM）, on which the Green＇s function is regarded as fundamental solution of a stratified half-space. Then the active isolation effectiveness by WIB is studied in detail under horizontal-rocking loading in elastic half-space. Effects of relevant parameters on the isolation effectiveness by WIB are analyzed in detail. The results show that WIB is efficient to isolate the vibration by horizontal-rocking coupled loading. Increasing the thickness and shear modulus of WIB, and decreasing the embedment depth of WlB can substantially increase the screening effectiveness. Moreover, increasing the diameter of WlB can diminish the amplitude of surface displacement in the area of WIB obviously, while the effect of it on outside ones is more complex.