大直径桩-土系统作用下解析解与室内模型试验研究

Study on analytical solution and indoor model test for Large Diameter Pile-Soil System

将桩视为一维杆件的基础上考虑桩身横向惯性效应,建立大直径桩与三维连续介质土耦合振动模型,得出此模型的耦合振动方程,并得到大直径桩顶时域响应半解析解,分析大直径桩代表性参数对桩-土系统的动力影响;随后开展大直径模型桩室内试验研究,对模型桩桩顶施加小应变激振力,通过EPPDS型无线基桩动测仪进行小应变下的桩顶数据采集,对改变模型桩的直径及桩身材质进行相关参数研究,将理论计算的结果与试验测试数据进行对比分析,证实了理论解分析的正确性及对实践指导的可靠性。

The lateral inertial effect of the pile is considered on the basis of one-dimensional bar, coupling vibration equation of large diameter pile and three-dimensional continuum soil is established, and the semi-analytical solution of time response of large diameter pile is obtained. The dynamic effects of the parameters of the large diameter pile on the pile - soil system are analyzed. Then, the large-diameter model piles are tested in laboratory, and the small-strain exciting force is applied to the top of the model piles. The pile top data are collected by the EPPDS wireless piles dynamometer. The correlation parameter are analyzed by changing the diameter of the model pile and the pile body material. The results of theoretical calculations are compared with the experimental data to verify the correctness of analytical solution and the reliability of practical guidance.