饱和土中孔列对平面快纵波的隔离效应  

Isolation effect of cavity array in saturated soils on plane fast longitudinal waves

作　　者：李校兵[1,2] 戴鹏燕 

机构地区：[1]温州大学建筑与土木工程学院,浙江温州325035 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310027 [3]宁波市北仑区建设设计研究院,浙江宁波315800

出　　处：《地震工程与工程振动》2011年第2期25-30,共6页Earthquake Engineering and Engineering Dynamics

基　　金：建设部科技计划项目(2009K313;2009K315);浙江省自然科学基金项目(Y1110567);温州市科技计划项目(S20080016;S20090034)

摘　　要：在Biot饱和土波动理论的基础上,用单排孔列作为屏障,对全空间饱和土中入射平面快纵波进行了隔离分析。采用波函数展开法,将入射波和散射波的势函数展开成Fourier-Bessel函数的无穷级数的形式,利用一组可以求解多散射问题的圆柱坐标系统和界面处位移连续的条件,得到问题的理论解。对影响隔离效果的孔间距和饱和土的渗透性等参数进行了分析,结果表明,单相弹性土体中孔列隔离效果要比饱和土体差,饱和土的渗透性对隔离效果有较明显的影响,饱和土渗透系数越小,孔列屏障后一定距离处的隔离效果越好。In this paper,on the basis of Biot＇s dynamic theory,the isolation of one cavity array as barrier for plane fast longitudinal wave is investigated in saturated soils in a homogeneous unbounded space.By using wave functions,the potential functions of incident waves and scattered waves are expanded into infinite series of Fourier-Bessel functions.Theoretical solutions are found by using a set of cylindrical coordinates,which can solve multiple-scattering problems.The influence of cavity spacing and saturated soil permeability coefficient on the isolation effect of cavity array is studied,and the results show that the permeability coefficient of saturated soils has a significant influence on the isolation effect of cavity array compared with single-phase elastic soil.The isolation effect at a certain distance from the cavity array becomes more apparent as the permeability coefficient of saturated soil decreases.

关 键 词：饱和土 孔列 波函数 隔离效果 

分 类 号：TU435[建筑科学—岩土工程] P315.98[建筑科学—土工工程]