关键词: 动力相互作用因子, 桩, 筏板

Abstract:

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.

Key words: dynamic interaction factor, piles, raft foundation