层状地基中群桩的水平振动特性

采用动力Winkler地基模型模拟桩土之间的动力相互作用,并运用传递矩阵法考虑地基土的分层特性,提出了计算层状地基中单桩和群桩动力阻抗函数的一种简化方法。在计算动力相互作用因子时考虑了“被动桩”与周围土体之间的相互作用。最后将相互作用因子和群桩阻抗的本文解与精确解进行了对比,同时与有关现场试验结果作了比较,验证了本文方法的有效性。

Lateral vibration of pile groups in layered soil

A simple analytical solution was outlined for computing the lateral dynamic impedance of single floating piles and floating pile groups in layered soil media. A dynamic Winkler model utilizing the finite-element-based springs and dashpots was adopted for the effect of pile-soil interaction, combining with a transfer-matrix formulation in the case of multi-layered soils. Attention was then given to the lateral dynamic stiffness and damping of group piles. Pile-soil-pile interaction was considered by assuming interaction between the passive piles and the surrounding soil. It was demonstrated that the predicted result of the proposed simplified method was in good agreement with rigorous numerical solutions. Such a simplified approach was quite efficient for the computation of single piles and pile groups subjected to lateral vibration, and provided a useful tool for engineers due to its simplicity.