饱和粘弹性土层中悬浮桩的纵向振动  

Vertical Vibration of Floating Pile in Saturated Viscoelastic Soil

作　　者：杨骁[1] 王琛[2] 

机构地区：[1]上海大学,上海200072 [2]上海大学上海市应用数学和力学研究所,上海200072

出　　处：《应用力学学报》2009年第3期490-494,共5页Chinese Journal of Applied Mechanics

基　　金：上海市自然科学基金(06ZR14037);上海市重点学科建设项目(Y0103)

摘　　要：基于不可压饱和粘弹性多孔介质理论和一维杆件模型,利用虚拟土桩的概念,研究了不可压饱和粘弹性土层中悬浮桩纵向振动的动力刚度。通过势函数解耦和三角级数解法,得到了悬浮桩纵向谐调振动的半解析解和桩头动力刚度。在此基础上通过数值计算,研究了物性参数、几何参数等对刚度的影响,结果表明:悬浮桩纵向振动的动力刚度受桩长、土的软硬程度、激振频率等的影响,对比了细长桩和短粗桩的响应差异,这些结果可为悬浮桩-土相互作用的数值分析和工程设计提供参考。Following the theory of incompressible saturated viscoelastic porous media and one-dimensional bar model, the dynamical stiffness of a floating pile vertically vibrating in a viscoelastic saturated soil layer is investigated. The potential functions are employed to decouple the governing equations to obtain soil response, and the semi-analytical solutions for response of the floating pile subjected to vertical harmonic excitation at the pile top and its dynamical stiffness are described with Fourier series. Then, the influences of the material and geometry parameters of pile and saturated soil on the stiffnesses at the pile top are examined numerically. It is shown that the dynamical stiffness of the floating pile depends on the pile length, soil property and excitation frequency, etc. The differences of the dynamical stiffness between slender and short piles are discussed.

关 键 词：饱和多孔介质理论 悬浮桩 土-桩相互作用 纵向振动 复动力刚度 

分 类 号：TU473.12[建筑科学—结构工程] O347.1[建筑科学—土工工程]