Abstract Piles are commonly used in wharfs and offshore platform foundations. The coupled effects of current scour and dynamic load can reduce the non-deformability of a pile-soil system and ultimately lead to structural instability of structures. This paper develops a simplified method to study the dynamic interaction of layered saturated soils and piles under current scour conditions. Fundamental solutions for the dynamic consolidation of layered soil are obtained by the analytical layer element method (ALEM). The pile is modelled as a one-dimensional bar and solved by the finite element method (FEM). By coupling the ALEM and the FEM, solutions for the dynamic behaviour of the pile in soils are obtained while considering current scour. A flexibility matrix that is assembled by fundamental solutions is modified and expanded to match the stiffness matrix of the pile by the simplified method. This approach can solve pile-soil dynamic interaction problems under varied scouring conditions. The influences of scour type, scour depth, excitation frequency and layered property are examined, and the results show that the dynamic behaviour of the pile can be accurately simulated using the simplified method.

中文翻译：

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一种考虑电流冲刷的分层饱和土中桩动力特性评估的简化方法

摘要 桩通常用于码头和海上平台基础。电流冲刷和动力荷载的耦合效应会降低桩土系统的不可变形性，最终导致结构的结构失稳。本文开发了一种简化方法来研究当前冲刷条件下分层饱和土和桩的动力相互作用。层状土动力固结的基本解是通过分析层元法（ALEM）获得的。桩被建模为一维杆，并通过有限元方法 (FEM) 求解。通过耦合 ALEM 和 FEM，可以在考虑电流冲刷的同时获得桩在土壤中的动态行为的解决方案。通过简化方法修改和扩展由基本解组装的柔度矩阵以匹配桩的刚度矩阵。这种方法可以解决不同冲刷条件下的桩土动力相互作用问题。研究了冲刷类型、冲刷深度、激振频率和分层特性的影响，结果表明，使用简化方法可以准确地模拟桩的动力行为。