This paper presents a new analytical model for calculating the dynamic performance of pile groups subjected to vertical loads. The derived solution allows considering the robust pile-to-pile coupled interaction on impedance of the pile group, by accounting for the secondary waves generated by the vibration of the receiver pile. For that, we introduce a dynamic coupling factor to modify the classical pile-to-pile interaction factor to illustrating the coupling effect of the source and receiver pile. Numerical results obtained for typical problem parameters indicate that this coupling effect can be important for closely spaced pile group, pile groups with large slenderness ratio or pile groups with large group members. The proposed solution is capable of determining the frequency-dependent impedance of large pile groups comprising arbitrary numbers of piles, which numerical modelling can be cumbersome.

本文提出了一种新的分析模型，用于计算竖向荷载下群桩的动力性能。推导的解决方案通过考虑接收器桩的振动所产生的二次波，可以考虑桩组阻抗上可靠的桩对桩耦合相互作用。为此，我们引入了动态耦合因子来修改经典的桩对桩相互作用因子，以说明源桩和接收桩的耦合效果。对于典型问题参数的数值结果表明，这种耦合效应对于间距很小的桩组，细长比大的桩组或组成员大的桩组可能很重要。