风机嵌岩桩单桩竖向承载力特性研究

Research on the vertical bearing capacity characteristic of wind turbine’s rock-socketed pile

根据国内某风电场的试桩报告,考虑嵌岩桩受到竖向荷载作用下,桩土和桩岩摩阻力不能同时发挥作用,提出桩土摩阻力折减系数,对现有桩基规范中单桩抗拔承载力计算公式进行了修正。采用有限元软件MIDAS建立嵌岩桩单桩基础模型进行静力学仿真模拟,分析了嵌岩桩在竖向荷载作用下的位移和轴力分布特点,确定了桩周土层的摩阻力折减系数的值,并用试桩报告的结果验证了数值模拟结论的准确性。

According to the pile test report of a domestic wind farm,this paper puts forward a reduction coefficient of the pile-soil friction and modifies the calculation formula of the single pile’s uplift bearing capacity in the existing code for pile foundation,considering the factors that the pile-soil and pile-rock friction cannot work at the same time under the vertical load.The finite element software MIDAS is used to establish the single pile foundation model of rock-socketed pile for static simulation.The distribution characteristics of the displacement and axial force under the vertical load are analyzed and the reduction coefficient of the pile-soil friction is determined by results of the numerical simulation.Results of the pile test report verifies the accuracy of the numerical simulation.