作为海上风电机组的常用基础形式,大直径海洋钢管桩基础的桩-土作用模式与传统小直径桩区别明显,常用的美国石油学会API规范无法准确评估大直径海洋钢管桩基础的承载性能。采用数值分析方法研究砂土中不同桩-土刚度比对大直径单桩水平承载特性的影响,揭示了桩-土刚度比和位移选取条件对单桩水平承载力的影响规律,结果表明：随着桩-土刚度比的增大,单桩水平承载力呈现降低趋势,且随着桩径的增大,水平承载力对桩-土刚度比的敏感性减弱;不同泥面位移下单桩水平承载力与桩-土刚度比均呈现对数关系。基于水平承载模式、位移条件和土体强度对水平承载力的影响,建立大直径单桩归一化水平承载力计算方法。
Abstract
As a common foundation type for offshore wind turbines, the pile-soil interaction mechanism of large-diameter marine steel pipe pile foundations is significantly different from that of traditional small-diameter piles. The commonly used API specifications are unable to accurately assess the load-bearing performance of large-diameter marine steel pipe pile foundations. This study employs numerical analysis methods to investigate the influence of different pile-soil stiffness ratios in sandy soils on the horizontal load-bearing characteristics of large-diameter single piles. It reveals the influence laws of pile-soil stiffness ratios and displacement selection conditions on the horizontal load-bearing capacity of single piles. The results indicate that, as the pile-soil stiffness ratio increases, the horizontal load-bearing capacity of single piles tends to decrease. Moreover, with the increase in pile diameter, the sensitivity of the horizontal load-bearing capacity to the pile-soil stiffness ratio weakens. The horizontal load-bearing capacity of single piles exhibits a logarithmic relationship with the pile-soil stiffness ratio under different seabed displacements. Based on the influence of horizontal load-bearing mechanisms, displacement conditions, and soil strength on the horizontal load-bearing capacity, a normalized horizontal load-bearing capacity calculation method for large-diameter single piles is established.
关键词
海上风电 /
大直径单桩 /
水平承载力 /
桩-土刚度比 /
水平受荷响应
Key words
offshore wind power /
large-diameter single pile /
horizontal bearing capacity /
pile-soil stiffness ratio /
horizontal loading response
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基金
国家重点研发计划（2022YFB2603000）; 国家自然科学基金青年项目（42407276）; 天津市青年基金（23JCQNJC01840）
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