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受风、波浪等荷载作用海上大直径单桩的水平循环受荷特性在其设计中更为关键。基于有限差分程序,通过开发用户子程序实现土体刚度衰减模型的嵌入,分析循环次数和荷载特征对桩基累积变形的影响规律,并讨论累积变形预测模型的适用性与可靠性。研究结果表明,密砂地基中荷载值的增加将导致累积变形发展加快,设计最大循环荷载值应控制在0.58倍的桩基静承载力内;对数模型能较好地预测小循环荷载值作用下桩基累积变形,而低估较大荷载值引起的累积变形;幂函数模型较好地反映不同荷载作用下的桩基累积变形发展规律,且模型参数α的取值随着荷载幅值的增加呈线性增大,并给出了不同荷载下幂函数模型的设计参数。
Affected by the wind, waves and other large-diameter offshore single-pile load-bearing characteristics in the design of the more critical. Based on the finite difference program, the user subroutine is used to realize the embedding of soil stiffness attenuation model, and the influences of cycle number and load characteristics on the cumulative deformation of pile foundation are analyzed. The applicability and reliability of the cumulative deformation prediction model are also discussed. The results show that the increase of load in the sand foundation will lead to the accelerated development of cumulative deformation. The maximum cyclic load should be controlled within 0.58 times the static load capacity of pile foundation. Logarithmic model can better predict the effect of small cyclic load The cumulative deformation caused by the pile foundation is underestimated, while the cumulative deformation caused by the larger load value is underestimated. The power function model can better reflect the pile foundation deformation deformation under different loads, and the value of the model parameter α increases with the load amplitude Linearly increases, and gives the design parameters of the power function model under different loads.