ABSTRACT

The bucket foundation is a new type foundation which is suitable for offshore wind turbines. The failure envelope is used to check the bearing capacity under combined loading conditions, especially for foundations with irregular shapes. Due to the coupling effect between horizontal and moment loads, the H-M failure envelope has an obvious asymmetry, which makes the established algebraic equation of the envelope form complex and inconvenient to apply. In this paper, an optimised failure envelope is proposed to reduce the coupling degree between horizontal and moment loads by moving the load reference point to the rotation centre of bucket foundation. Furthermore, the algebraic equation of the failure envelope is established based on the optimised envelope by using the depth of the bucket foundation rotation centre. The equation has fewer parameters and clearer physical meanings than the conventional one, which is convenient for engineering applications.

摘要

斗式基础是一种适用于海上风力发电机组的新型基础。破坏包络用于检查组合载荷条件下的承载能力，特别是对于形状不规则的基础。由于水平载荷和力矩载荷之间的耦合效应，HM失效包络具有明显的不对称性，使得建立的包络形代数方程复杂，应用不便。本文提出了一种优化的破坏包络线，通过将荷载参考点移动到斗式基础的旋转中心来降低水平荷载与力矩荷载之间的耦合度。进而，利用斗式基础旋转中心的深度，在优化包络线的基础上建立失效包络线的代数方程。该方程比常规方程参数少，物理意义更明确，便于工程应用。