Abstract Accurate evaluation of dynamic resistance provided by the surrounding soil is the key to determining the dynamic performance of the pile foundation, especially for long piles. A new method is proposed to evaluate the dynamic pile-side soil resistance (DPSR). A dynamic coupled model of the pile-soil system is established considering the three-dimensional nature of the surrounding soil. Analytical solutions are then deduced for the dynamic response of each point along the pile shaft. The derived analytical solutions are then used to investigate several characteristics of the DPSR by analyzing the attenuation of the incident wave propagating along the pile shaft. The results show that the effect of DPSR decreases gradually from the pile top to tip under low-strain dynamic loading conditions, and it increases as the shear wave velocity of the surrounding soil increases between points under consideration along the pile shaft. It is also found that energy dissipation is the most important mechanism of soil resistance during longitudinal vibration associated with low strain axial loading, and thus damping should be evaluated carefully. The findings from this study aid in understanding the dynamic pile-soil interaction and provide practical guidance for analyzing the effect of the DPSR in engineering practice.

中文翻译：

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纵向振动过程中桩侧土体动态阻力

摘要 准确评价周围土体提供的动力阻力是确定桩基动力性能的关键，尤其是长桩。提出了一种评估动态桩侧土阻力（DPSR）的新方法。考虑周围土体的三维特性，建立桩土系统动力耦合模型。然后推导出沿桩轴每个点的动态响应的解析解。然后，通过分析沿桩轴传播的入射波的衰减，使用导出的解析解来研究 DPSR 的几个特性。结果表明，在低应变动态加载条件下，DPSR的影响从桩顶到桩尖逐渐减小，并且随着周围土壤的剪切波速度在沿桩轴考虑的点之间增加而增加。还发现能量耗散是与低应变轴向载荷相关的纵向振动过程中土壤阻力的最重要机制，因此应仔细评估阻尼。本研究的结果有助于理解动态桩土相互作用，并为分析 DPSR 在工程实践中的影响提供实际指导。