水平-摇摆耦合振动波阻板主动隔振三维分析
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摘要
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(WIB) 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 WIB can substantially increase the screening effectiveness. Moreover,increasing the diameter of WIB can diminish the amplitude of surface displacement in the area of WIB obviously,while the effect of it on outside ones is more complex.
The ground vibration isolation efficiency by wave impeding block(WIB) 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 WIB can substantially increase the screening effectiveness. Moreover,increasing the diameter of WIB can diminish the amplitude of surface displacement in the area of WIB obviously,while the effect of it on outside ones is more complex.
引文
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[2]PEPLOW AT,JONES CJC,PETYT M.Surface vibration propagation over a layered elastic half-space with an inclusion[J].Applied Acoustics,1999,56:283-296.
[3]高广运,李伟.二维地基波阻板隔振分析[J].地震工程与工程振动,2005,25(2):130-135.GAO Guang-yun,LI Wei.2-D analysis of ground vibration isolation using wave impeding block[J].Earthquake Engineering and Engineering Vibration,2005,25(2):130-135.
[4]TAKEMIYAH.Field vibration mitigation by honeycomb WIB for pile foundations of a high-speed train viaduct[J].Soil Dynamic and Earthquake Engineering,2004,24:69-87.
[5]稽醒,臧跃龙,程玉民.边界元法进展及通用程序[M].上海:同济大学出版社,1997.
[6]高广运,冯世进,李伟,等.三维层状地基竖向激振波阻板主动隔振分析[J].岩土工程学报,2007,29(4):471-476.GAO Guang-yun,FENG Shi-jin,LI Wei,et al.3D analysis of active vibration isolation with wave impedance block in layered ground under vertical loading[J].Chinese Journal of Geotechnical Eng-ineering,2007,29(4):471-476.
[7]SEAL SH.Dynamic loads in layered half-spaces[D].Cambridge:Department of Civil Engineering,MIT,1985.
[8]王贻荪.地面波动分析若干问题[J].建筑结构学报,1982,4(2):56-67.WANG Yi-sun.Some problems in the ground vibration analysis[J].Journal of Building Structures,1982,4(2):56-67.
[9]WOODS RD,BARNET NE,SANGESSER RH.A new tool for soil dynamics[J].Journal of Geotechnical Engineering,1974,100(11):1231-1247.
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