饱和地基中二维填充沟远场被动隔振研究  

Two-dimensional analysis of in-filled trenches as passive barriers in saturated soil

作　　者：时刚[1,2] 郭院成[1] 高广运[2] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土工程学报》2011年第1期104-111,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50878155;50678128)

摘　　要：针对饱和均质地基中二维填充沟远场被动隔振问题,首先,基于饱和多孔介质频域边界元法,建立了以薄层法(TLM)基本解作为动力Green函数的饱和土半解析边界元法,该方法可有效的分析饱和半空间的动力问题,是解决土–结构动力相互作用问题的一种有效工具。在此基础上,根据填充沟与周围土体的邻接条件,推导得到了填充沟对Rayleigh波散射的二维边界元方程;运用上述边界元方程,对刚性填充沟的远场隔振问题进行了详细的参数分析。结果表明:在饱和地基中设置填充沟能够对地面振动起到有效的隔振作用;增加填充沟的深度和剪切模量均能有效地提高其隔振效果;填充沟宽度对隔振效果影响较为复杂,而填充材料的泊松比对隔振效果则基本没有影响。A study on the problem of vibration isolation efficiency by in-filled trenches as passive barriers in homogeneous saturated ground is presented.The investigation is accomplished by use of the semi-analytical boundary element method（BEM） in cooperation with the basic solution of the thin layered method（TLM）.Consequently,a two-dimensional semi-analytical BEM model is put forward,where the TLM basic solution is employed,to use in-filled trenches as passive barriers taking into account the dynamical interaction of soil-structure.The effect of the model parameters on the effectiveness of vibration isolation by harder in-filled trenches is investigated and discussed.The results show that the in-filled trenches are efficient to isolate the ground vibrations due to the incident Rayleigh wave.Increasing trench depth and shear modulus can result in an increase in the screening effectiveness,while the Poisson＇s ratio of trench has less effect on the screening effectiveness.Moreover,the width of the trenches can affect the screening efficiency greatly and in a complex way.

关 键 词：薄层法 边界元 填充沟 饱和地基 隔振效果 

分 类 号：TU435[建筑科学—岩土工程]