考虑土体三维波动效应下摩擦型管桩竖向动力响应特性分析

    Dynamic response characteristics of floating pipe piles considering the three-dimensional soil deformations

    • 摘要: 本文基于Tajimi连续介质模型,研究了考虑土体三维波动效应的轴向动荷载作用下摩擦型管桩动力响应。将土体视为黏弹性连续介质并分别建立桩周和桩芯土体的竖向和径向位移控制方程,引入势函数对控制方程解耦,采用分离变量法求得土体位移解析表达式,进而求得桩周和桩芯土体竖向阻抗表达式。将管桩和下方土柱视为一维弹性杆并建立管桩和土柱的竖向位移控制方程,考虑桩-土相互作用并结合边界条件最终推导得到管桩竖向位移的解析表达式。基于所得的解探讨了考虑土体三维波动效应与忽略土体径向位移条件下的摩擦型管桩动力响应差异。

       

      Abstract: The dynamic response of floating pipe piles under axial dynamic loads considering the soil three-dimensional wave effects is studied in this paper based on the Tajimi’s continuous medium model. The soil layer is treated as Tajimi-type viscoelastic continuum, and the vertical and radial displacements governing equations of outer and inner soil are established respectively. The governing equations is decoupled by introduced potential functions, and the expressions for the displacement of the outer and inner soil is obtained by means of the method of separation of variables, then the expressions for the vertical dynamic soil resistances is derived. The pipe pile and its underlying soil column is regarded as one-dimension rods and the governing equations describing vertical displacements of pipe pile and soil column is established. The analytical expression for the vertical displacement of pipe pile is finally obtained by considering pile-soil interaction and combining boundary conditions. Based on the solution, the differences in dynamic response between floating pipe piles considering three-dimensional wave effects of soil and those ignoring the radial displacement of soil are discussed.

       

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