层状饱和地基上刚性条形基础的动力刚度  

Dynamic stiffness of rigid strip foundation on layered saturated soil

作　　者：尤红兵[1] 赵凤新[1] 梁建文[2] 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]天津大学土木工程系,天津300072

出　　处：《岩土工程学报》2007年第3期442-446,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金资助项目(50378063)

摘　　要：利用饱和土层的精确动力刚度矩阵求解了动力Green函数,将基础和场地交界面离散,根据交界面上的位移边界条件得到层状饱和场地上刚性条形基础的动力刚度。对工程中常用的四种场地(饱和均匀半空间、基岩上单一饱和土层、饱和半空间上单一饱和土层、层状饱和场地)上刚性条形基础的动力刚度进行了对比和分析。研究表明:层状场地结果与其他场地结果有着明显的不同;当上覆土层较厚时,其他三种模型结果基本一致。本文方法可进一步推广到层状饱和场地中任意埋置基础动力刚度的计算中。Dynamic Green＇s functions were computed by using an exact dynamic-stiffness matrix method. The interface of foundation and soil was discretized. Based on the displacement boundary conditions at the interface, the dynamic impedances of rigid strip foundation on layered saturated soil were obtained, The dynamic impedances of strip rigid foundation on four different saturated sites （Homogeneous poroelastic half-space, Homogeneous layer with rigid base, A single layer resting on a half-space, Layered saturated soils ） were compared and analyzed. The numerical studies indicated the differences between the results of layered site and other sites, and the necessity to use the layered model was shown. When the covering soil was thick, the results of other three sites would be consistent. This method could be extended to calculatie the dynamic impedances of rigid foundations of arbitrary shape embedded in layered poroelastic half-plane.

关 键 词：饱和场地 动力GREEN函数 刚性条形基础 动力刚度 

分 类 号：TU471[建筑科学—结构工程]