地基基础是海上风电结构所受载荷的最终承载者,针对中国沿海软弱超固结软土地基开展力学特性研究。通过离心模型试验方法对单桩基础形式的静力特性进行分析和对比。研究结果揭示通过离心模型试验模拟桩基础的有效性,该方法能准确捕捉现场地基的应力分布及桩与土体之间的相互作用特性。在软黏土环境中,针对不同直径的单桩进行的分析表明,其变形行为及桩土相互作用机制呈现出显著的差异性。规范中的p-y曲线不适用于中国近海土质,据试验结果提出地基无量纲水平抗力系数随埋深变化和与循环应力幅值相关的循环弱化因子计算模型。
Abstract
The foundation is the final carrier of the upper load of wind turbine. In this paper, the study on the mechanical properties of soft and over consolidated soil foundation in coastal China is carried out to provide guidance for the design of offshore wind turbine. The static characteristics of single pile foundation are analyzed and compared by centrifugal model test. The results show that the centrifugal model test of pile foundation can reflect the stress state and pile-soil interaction well, and the deformation mode and pile-soil interaction of single piles with different diameters are different in soft clay. p-y curves in the code are not suitable for offshore soil. According to the test results, the calculation model of dimensionless level force majeure coefficient changing with buried depth and the cyclic stress amplitude is put forward, which will provide reference for offshore wind.
关键词
海上风电 /
风力机 /
桩土作用 /
离心模型试验 /
循环加载 /
p-y模型 /
土抗力系数
Key words
offshore wind power /
wind turbines /
soil-structure interaction /
centrifugal model test /
cyclic loading /
p-y model /
soil resistance coefficient
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基金
辽宁省自然科学基金重点科技创新基地联合基金（2022-KF-18-01）; 中南院水能资源利用关键技术重点实验室开放基金（PKLHD202003）
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