群桩与筏板的竖向动力相互作用研究  

Dynamic interaction between pile groups and raft foundations in axial vibration

作　　者：徐新生[1] 燕彬[1] 

机构地区：[1]济南大学土木建筑学院,济南250022

出　　处：《岩土力学》2009年第1期281-284,共4页Rock and Soil Mechanics

基　　金：山东省自然科学基金项目(No.Y2006F56)。

摘　　要：对沿深度离散形成一系列均质的土层,应用传递矩阵法推导出单桩的动力阻抗。借助推求的桩-桩动力相互作用因子,研究承台板与群桩的竖向动力相互作用,通常假设承台板是刚性的,并充分考虑了承台板具有一定的刚度、可以变形的柔性承台板,提出承台板-群桩动力相互作用模型,然后推出其动力相互作用方程。通过算例说明了承台板的刚度对承台板的动力作用是有影响的。研究结果表明,振动频率越低,柔性承台板的振幅与刚性承台板的振幅相差越大;随着频率的增大,二者差别也减小,并逐渐趋于相等。The behaviors of soil layers with different depths are presented mainly. The pile group and the surrounding soil is discretized into horizontal layers. By means of that the single pile dynamic impedance is developed using a transfer matrix method; the pile-to-pile dynamic interaction factor is derived. So, the dynamic model is accounted for axial vibration between pile groups and raft foundations. It isn＇t assumed that the raft is a rigid body instead of its flexibility. These new points are completed in the equation of motion of the interaction between pile groups and raft foundations. Finally, an example shows that the stiffness of a raft has an effect on the dynamic interaction. It is demonstrated that frequency in vertical vibration is lower; the difference of vertical amplitudes between a rigid and flexible plates is larger; otherwise, the difference of them is minor, even equal.

关 键 词：动力相互作用因子 桩 筏板 

分 类 号：TU473[建筑科学—结构工程]