层状地基中群桩竖向振动及动内力

Vertical Vibration and Internal Forces of Pile Groups in Layered Soil

采用Gazetas和Makris通过拟合有限元计算结果所得到的弹簧系数和阻尼系数,基于动力Winkler地基模型和传递矩阵法,提出了一种分析层状地基中单桩和群桩竖向振动特性的简化方法.在考虑了“被动桩”和周围土体之间的相互作用的情况下求解层状土层中的桩桩动力相互作用因子.在这基础上,计算群桩竖向动力阻抗以及群桩中单桩桩身动内力,通过相关算例分析验证了方法的适用性.

The paper introduces a simple analytical solution for computing the axial dynamic impedance of single floating piles and floating pile groups in layered soil media. A dynamic Winkler model and the finite-element based spring and dashpots of Gazetas and Makris （1991） are used in combination with a transfer-matrix formulation for a study of the effect of pile-soil interaction. Attention is then given to the axial dynamic stiffness and damping of group piles. Pile-soil-pile interaction is assumed by considering interaction between the receiving pile and the surrounding soil. It demonstrates that the simplified method with rigorous numerical solutions can be used for prediction. Such a simplified approach is very efficient for the computation of single piles and pile groups subjected to vertical vibration, and is also a useful tool for engineers due to its simplicity.