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采用动力Winkler动力梁模型,由传递矩阵法推导了部分埋入单桩竖向振动的计算公式;充分考虑了被动桩与土体的共同作用,基于桩–桩相互作用因子的叠加法,建立了部分埋入群桩的动力模型。通过参数(埋入比L1/L2、桩间距s/d和激振频率f)探讨,得到了匀质半空间和层状地基中常见部分埋入群桩的动力特性变化规律:①埋入比的增大会显著的降低单桩和群桩的阻抗;②部分埋入桩的存在会降低桩–桩相互作用,从而进一步消弱群桩的空间协同工作的能力;③部分埋入桩对于群桩基础的低频动力响应影响不大,但随着频率的提高而日益显著。然后,本文的退化解与现场实测结果和试验数据进行了比较。最后,本方法被用于分析某海上风力发电机组群桩基础的幅频曲线,并指出了其动力响应与完全埋入群桩的差异,为工程设计提供参考。
The dynamic Winkler dynamic beam model is adopted and the transfer matrix method is used to derive the calculation formula of the vertical vibration of partially embedded single pile. Considering the interaction of passive pile and soil, based on the superposition method of pile-pile interaction factor, Dynamic model of partially embedded pile groups. Through the discussion of the parameters (embedment ratio L1 / L2, pile spacing s / d and excitation frequency f), the variation of dynamic characteristics of buried partial pile groups in homogeneous half-space and layered soil is obtained: ① Burial ratio Will significantly reduce the impedance of single pile and group pile; (2) The partial buried pile will reduce the pile-pile interaction, so as to further weaken the ability of group pile space to work together; (3) The basic low-frequency dynamic response has little effect, but becomes increasingly pronounced with increasing frequency. Then, the regression solution in this paper is compared with the field measured data and the experimental data. Finally, the method is used to analyze the amplitude-frequency curve of pile foundation of a offshore wind turbine generator group. The difference between the dynamic response and the fully embedded pile group is pointed out, which can provide references for engineering design.