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海上风机加翼桩是一种在近地表桩体上设置翼片以充分发挥浅层土抗力的新型基础形式,目前工程上尚缺乏对其在水平荷载作用下的变形计算方法。首先对于黏土地基中大直径加翼桩水平承载特性进行了有限元数值分析,得到了加翼桩桩周土体变形模式,进而提出了海上风机加翼桩水平受荷的等效扩大头桩模型。基于该简化分析模型,结合考虑桩径效应的大直径单桩p-y曲线,建立了水平荷载作用下海上风机加翼桩变形计算方法。通过与已有原位试验结果和有限元计算结果的对比,验证了所建议计算方法的合理性。采用所建议计算方法,系统探讨了桩体尺寸、翼片尺寸、桩周土力学参数等对于桩头位移及桩身内力分布规律的影响,并从降低位移角度提出了翼片效率指标,初步建议了达到最优翼片效率的翼片尺寸。
Offshore wind turbine plus wing is a new type of foundation in which the fins are set up on the near surface pile body to give full play to the shallow soil resistance. At present, the deformation calculation method under horizontal load is lacking in engineering. First, the finite element analysis of the horizontal bearing capacity of large diameter and wing pile in clay foundation is carried out. The deformation mode of soil around the wing is obtained, and then the equivalent enlarged model of the head pile subjected to horizontal loading of the offshore wind turbine and the wing pile is proposed . Based on the simplified analysis model and the p-y curve of large diameter single pile considering the pile diameter effect, a method of calculating the deformation of the offshore wind turbine plus wing pile under horizontal load is established. By comparing with the existing experimental results in situ and the results of finite element analysis, the validity of the proposed calculation method is verified. Based on the proposed calculation method, the influences of pile size, wing size and soil mechanics parameters on the pile head displacement and pile internal force distribution are systematically discussed. The efficiency index of the wing is proposed from the point of view of reducing the displacement. The preliminary suggestions Fins for optimal wing efficiency.