考虑挤土效应的大直径管桩纵向振动特性研究

doi:10.13722/j.cnki.jrme.2016.0530

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摘要

基于考虑土体竖向波动效应的三维轴对称模型，研究考虑挤土效应时的大直径管桩纵向振动特性。首先，将桩周土及桩芯土沿径向分别划分为若干同心圆圈层，各圈层内部土体径向均质；然后，分别建立各圈层桩周土及桩芯土的纵向振动控制方程，求解方程并根据各相邻圈层及桩–土接触面上应力和位移的连续条件，递推得到桩周土–桩及桩芯土–桩之间的动力相互作用，将其代入到桩的纵向振动控制方程中，进而求解得到桩顶频域响应解析解；最后，通过参数分析的方法，在低频范围内研究大直径管桩桩身设计参数及挤土效应对桩顶复阻抗的影响，并通过与已有文献的对比证明本文解的合理性。

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	李振亚1
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	王奎华1
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	吴文兵3

关键词 ：桩基础, 大直径管桩, 纵向振动, 挤土效应, 复阻抗, 三维轴对称模型

Abstract：

Based on the three-dimensional axisymmetric model which only considers the vertical wave effect of soil，the vertical vibration of a large diameter pipe pile is investigated considering the compacting effect. First，the outer soil and inner soil are respectively divided into finite vertical annular zones，and the soil within the same zone is considered as homogeneous. Then，the vertical vibration governing equations of each soil zone are built. By solving the equations and together with the continuity of the displacements and stresses at both the interfaces of pile-soil and the interfaces of the adjacent soil zones，the dynamic interactions of pile-outer soil and pile-inner soil are obtained and are substituted into the governing equation of pile to obtain the analytical solution for dynamic response at the pile head in the frequency domain. Finally，a parametric analysis is conducted within the low frequency range to analyze the influence of pile parameters and the compacting effect on the complex impedance at the pile head. Meanwhile，comparison with the published solution is carried out to verify the reliability of the present solution.

Key words： pile foundation large diameter pipe pile vertical vibration compacting effect complex impedance three-dimensional axisymmetric model

引用本文:

李振亚1，2，王奎华1，2，吴文兵3. 考虑挤土效应的大直径管桩纵向振动特性研究[J]. 岩石力学与工程学报, 2018, 37(S1): 3623-3632.
LI Zhenya1，2，WANG Kuihua1，2，WU Wenbing3. Vertical vibration of a large diameter pipe pile considering the compacting effect. , 2018, 37(S1): 3623-3632.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0530 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS1/3623

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