海上风电楔形单桩基础竖向承载力特性分析

为提高基础利用率增加海上风电设施的可行性，对楔形单桩基础竖向承载力特性进行研究分析。采用PLAXIS 3D 有限元软件建立楔形单桩基础模型，从桩侧摩阻力、桩侧法应力及土体位移对比分析楔形单桩基础与等截面单桩竖向承载特性差异，并探讨内摩擦角、楔角及楔高对承载力的影响。研究表明：楔形单桩基础竖向承载力高于等截面单桩基础，且承载力随着楔角、楔高的增大而增大，提高率最大达24.786%。倾斜侧壁的引入改变了桩侧摩阻力的传递规律；倾斜侧壁挤密桩周土体，桩侧摩阻力与法向应力增大，从而有效提高单桩基础的竖向承载力。研究成果可为今后海上风电单桩基础截面型式的设计提供参考。

英文摘要:

In order to improve the foundation utilization and increase the feasibility of offshore wind power facilities, the vertical bearing capacity characteristics of wedged monopiles are studied and analyzed. The wedged monopile model is established by using the PLAXIS 3D finite element software. The vertical bearing characteristics of the wedged monopile and the equal-section monopiles are compared and analyzed from the aspects of pile side friction resistance, pile side normal stress and soil displacement, and the influence of internal friction angle, wedge angle and wedge height on the bearing capacity is discussed. The research shows that the vertical bearing capacity of wedge single pile foundation is higher than that of single pile foundation with equal section, and the bearing capacity increases with the increase of wedge angle and wedge height, with the maximum increase rate of 24.786%. The introduction of inclined side wall changes the transfer law of pile side friction; The inclined side wall compacts the soil around the pile, and the pile side friction and normal stress increase, thus effectively improving the vertical bearing capacity of the monopiles. The research results provide reference for the selection and design of offshore wind power foundation in the future.

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