非均质土中桩端扩散虚土桩法的桩基纵向振动研究

发布时间：2018-08-09 12:19

【摘要】：根据桩端土应力扩散的规律,建立了桩端扩散虚土桩模型。基于该模型对非均质土中桩-土纵向耦合振动进行研究。利用复刚度传递多圈层平面应变模型,得到桩与虚土桩桩侧土的剪切复刚度。结合边界条件、初始条件和连续条件,对扩散虚土桩和实体桩动力方程从底层往顶层逐层进行求解,得到桩顶动力响应的频域解析解和时域半解析解。通过对桩端扩散虚土桩扩散角、扩散层厚度、桩侧土非均质性和桩长的影响进行计算分析,得到基于扩散虚土桩法桩-土纵向振动响应特性。研究结论可为桩基础动力设计和动态检测提供理论依据。
[Abstract]:According to the law of soil stress diffusion at the end of pile, the model of virtual soil pile with pile end diffusion is established. Based on this model, the longitudinal coupling vibration of pile-soil in heterogeneous soil is studied. The shear complex stiffness of pile and soil on the side of virtual soil pile is obtained by using the plane strain model of multiple circles transmitted by complex stiffness. Combined with boundary condition, initial condition and continuous condition, the dynamic equations of diffusion virtual soil pile and solid pile are solved from the bottom layer to the top layer by layer, and the frequency domain analytical solution and the time domain semi-analytical solution of the pile top dynamic response are obtained. By calculating and analyzing the influence of diffusion angle, diffusion layer thickness, heterogeneity and pile length, the longitudinal vibration response characteristics of pile-soil based on diffusion fictitious soil pile method are obtained by calculating and analyzing the influence of pile diffusion angle, diffusion layer thickness, heterogeneity of pile side soil and pile length. The conclusion can provide theoretical basis for dynamic design and dynamic detection of pile foundation.
【作者单位】：苏州科技学院土木工程学院;
【基金】：江苏省高校自然科学研究项目资助(No.11KJB560004) 苏州科技学院江苏省结构工程重点实验室开放课题项目资助(No.ZD1105) 苏州市建设系统科研项目资助(2012年)
【分类号】：TU473.1

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