海上风机复合单桩基础水平承载力数值分析

近年来海上风电发展迅速,装机容量不断增大,传统单桩基础受荷负担加重,故以单桩基础和安装在桩体外围的桶型基础(摩擦轮)组合而成的复合桩基础被逐渐采用,以保证风机服役期间的安全稳定。为研究复合桩基础承载性能,通过ABAQUS有限元软件开展复合桩基础水平承载性能的研究,分析其相较于传统单桩基础的承载力优势,并进一步进行优化设计。结果表明:相同受荷情况下,复合桩基础由于摩擦轮的存在,桩身泥面处位移和桩身弯矩均大幅减小,水平承载能力明显优于单桩基础;复合桩基础中摩擦轮直径和高度对其水平承载能力影响较明显,但其厚度对复合桩基础水平承载能力影响有限。可见复合桩基础承载能力明显优于单桩。

Numerical Analysis of Horizontal Bearing Capacity of Composite Pile Foundation for Offshore Wind Turbine

In recent years, offshore wind power has developed rapidly, the installed capacity has increased continuously, and the traditional single pile foundation is under heavier load. Therefore, the composite pile foundation composed of single pile foundation and bucket foundation (friction wheel) installed on the periphery of the pile body is gradually adopted to ensure the safety and stability of the fan during its service. In order to study the bearing capacity of composite pile foundation, the horizontal bearing capacity of composite pile foundation was studied by ABAQUS finite element software, and its bearing capacity advantages compared with traditional single pile foundation were analyzed, and further optimization design was carried out. The results show that under the same loading condition, due to the existence of friction wheel, the displacement at the mud surface of pile body and the bending moment of pile body are greatly reduced, and the horizontal bearing capacity is obviously better than that of single pile foundation. The diameter and height of friction wheel in composite pile foundation have obvious influence on its horizontal bearing capacity, but its thickness has limited influence on the horizontal bearing capacity of composite pile foundation. It can be seen that the bearing capacity of composite pile foundation is obviously better than that of single pile.