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基于简化的完全和部分埋入群桩动力计算模型,采用有限元子结构方法,提出可以考虑承台板对群桩动力阻抗贡献的计算方法,并对均质地基和层状地基中不同桩间距条件下,承台板厚度对群桩动力阻抗的影响给予分析,详细讨论承台板惯性力的变化对群桩动力特性的影响,指出刚性承台假定的局限性。然后重点研究不同承台板厚度条件下群桩内力的分布规律。最后通过对群桩现场试验和海上风机基础动力特性的模拟,并与传统的计算方法和试验结果进行对比,说明计算方法可以更为合理、准确地预测群桩的动力响应及其变化趋势。
Based on the simplified calculation model of fully and partially buried group pile dynamics, finite element method (FEM) is applied to calculate the contribution of the bearing plate to the dynamic impedance of pile groups. The influence of plate thickness on the dynamic impedance of pile group is analyzed. The influence of the change of inertial force on the dynamic characteristics of pile group is discussed in detail. The limitation of the assumption of rigid cap is pointed out. Then the focus is on the distribution of internal forces of pile groups under different plate thickness. Finally, by comparing the field test of group pile and the foundation dynamic characteristics of offshore wind turbine with the traditional calculation methods and experimental results, the calculation method can predict the dynamic response of pile groups and its changing tendency more reasonably and accurately.