层状饱和场地中圆柱形基础的阻抗函数  

Impedance functions of cylindrical rigid foundations embedded in layered, fluid-saturated, poroelastic half-spac

作　　者：韩冰[1,2] 梁建文[1,2] HAN Bing;LIANG Jianwen(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300354,China;Department of Civil Engineering,Tianjin University,Tianjin 300354,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300354 [2]天津大学建筑工程学院土木工程系,天津300354

出　　处：《地震工程与工程振动》2019年第1期1-7,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51578372)~~

摘　　要：本文利用间接边界元法,建立层状饱和场地中三维土-基础动力相互作用模型,研究了孔隙中流体的存在、场地动力特性和圆柱形基础的高度对基础阻抗函数的影响。数值结果表明,孔隙中流体的存在对基础阻抗函数有明显的影响,尤其是水平和竖向分量;场地动力特性也对基础阻抗函数有明显的影响,层状饱和场地中阻抗函数围绕相应均匀半空间结果振荡,且基岩与土层刚度比越大或土层厚度越小,振荡的幅度越大,土层厚度越小,振荡的周期越小;另外,基础高度也对阻抗函数有明显的影响,随基础高度增大,阻抗函数逐渐增大。The effects of the presence of the pore fluid,the site dynamic characteristics and the height of the cylindrical rigid foundation on impedance functions are studied by a three-dimensional dynamic soil-foundation interaction model in layered,fluid-saturated,poroelastic half-space using the indirect boundary element method.It’s shown that the pore fluid has evident influences on impedance functions,especially for horizontal and vertical components.The site dynamic characteristics also have significant effects,and the impedance functions in layered,fluid-saturated,poroelastic half-space oscillate around those in corresponding uniform half-space,with larger oscillation amplitudes for larger bedrock stiffness and smaller soil layer thickness,and with smaller oscillation period for smaller soil layer thickness.In addition,the height of the foundation influences the impedance function significantly,with larger amplitudes for higher foundation.

关 键 词：三维 层状场地 饱和 圆柱形基础 阻抗函数 孔隙流体 场地动力特性 

分 类 号：TU375[建筑科学—结构工程]