基于桩身三维效应下的大直径桩纵向振动分析
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作者单位:

1.苏州科技大学;2.江苏苏州地质工程勘察院

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中图分类号:

TU473

基金项目:

国家自然科学基金(51508369);江苏省自然科学基金(BK20150289)


Longitudinal Vibration Analysis of Large-diameter Piles Based on Three-dimensional Effect of Pile Body
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Affiliation:

Suzhou University of Science and Technology

Fund Project:

National Natural Science Foundation of China (51508369); Natural Science Foundation of Jiangsu Province (BK20150289)

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    摘要:

    基于饱和多孔介质理论,考虑桩身三维效应的影响,进行饱和土中大直径桩的纵向振动研究。利用饱和多孔介质理论和 Novak 薄层法的假定得出桩周土的剪切刚度,建立考虑桩身三维波动效应的大直径 桩-土耦合振动模型,得出此模型的耦合振动方程。结合初始条件和边界条件,利用拉普拉斯变换求解得到桩顶阻抗函数和频域响应函数的解析解,并通过卷积定理和傅里叶逆变换得出其时域响应函数的半解析解。先分析桩土参数对大直径桩动力响应的影响,得到了各参数对大直径桩振动响应的影响规律,再通过有限元数值模拟与室内模型试验,分别将数值解、试验解与理论解进行对比,计算结果相似,相互验证了三种模型建立的正确性,可为现实工况提供理论依据和指导意见。

    Abstract:

    Based on the theory of saturated porous medium, considering the influence of the three-dimensional effect of the pile body, the longitudinal vibration study of large-diameter piles in saturated soil is carried out. Using the saturated porous medium theory and the assumption of Novak thin layer method, the shear stiffness of the soil around the pile is obtained. Combined with the initial conditions and boundary conditions, the Laplace transform is used to obtain the analytical solutions of the pile top impedance function and the frequency domain response function, and the semi-analytical solution of the time domain response function is obtained through the convolution theorem and inverse Fourier transform. . Firstly, the influence of pile-soil parameters on the dynamic response of large-diameter piles was analyzed, and the influence law of each parameter on the vibration response of large-diameter piles was obtained. In comparison, the calculation results are similar, which mutually verifies the correctness of the three models, which can provide theoretical basis and guidance for actual working conditions.

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引用本文

杨冬英,李嘉超,李学东. 基于桩身三维效应下的大直径桩纵向振动分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2022-04-28
  • 最后修改日期:2022-07-02
  • 录用日期:2022-07-21
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