The dynamic pile-soil interaction in a liquefied site was investigated by means of numerical simulation and shaking table tests in this study. Based on the results from the shaking table experiment, the cross-correlation analysis of the soil displacement-pile bending moment and superstructure acceleration-pile bending moment was performed to study the influence of kinematic interaction and inertial interaction on the seismic response of piles. A relatively reasonable and accurate finite difference numerical analysis model of liquefiable soil-pile group-superstructure dynamic system was established. Through numerical simulation, the understanding of kinematic interaction and inertial interaction in the shaking table test was verified. The mass, damping and period of the superstructure were selected as variables to carry out parameter analysis to further study the influence of inertial interaction on the pile-structure failure mechanism. The results show that the influence of kinematic interaction on the pile was much greater than that of inertial interaction. The mass of the superstructure was the most important parameter of inertial interaction, and dynamic characteristics of the superstructure also had an effect on inertial interaction. The effect of inertial interaction on the part near the pile tip was more significant, indicating that the failure near the pile tip is closely related to inertial interaction.

本研究通过数值模拟和振动台试验研究了液化场地中的动力桩-土相互作用。基于振动台试验结果，对土体位移-桩弯矩和上部结构加速度-桩弯矩进行互相关分析，研究运动相互作用和惯性相互作用对桩地震响应的影响。建立了较为合理、准确的液化土-群桩-上部结构动力系统有限差分数值分析模型。通过数值模拟，验证了对振动台试验中运动相互作用和惯性相互作用的理解。质量，选择上部结构的阻尼和周期作为变量进行参数分析，进一步研究惯性相互作用对桩结构破坏机制的影响。结果表明，运动相互作用对桩的影响远大于惯性相互作用。上部结构的质量是惯性相互作用最重要的参数，上部结构的动力特性也对惯性相互作用产生影响。惯性相互作用对桩尖附近部分的影响更为显着，表明桩尖附近的破坏与惯性相互作用密切相关。结果表明，运动相互作用对桩的影响远大于惯性相互作用。上部结构的质量是惯性相互作用最重要的参数，上部结构的动力特性也对惯性相互作用产生影响。惯性相互作用对桩尖附近部分的影响更为显着，表明桩尖附近的破坏与惯性相互作用密切相关。结果表明，运动相互作用对桩的影响远大于惯性相互作用。上部结构的质量是惯性相互作用最重要的参数，上部结构的动力特性也对惯性相互作用产生影响。惯性相互作用对桩尖附近部分的影响更为显着，表明桩尖附近的破坏与惯性相互作用密切相关。