斜坡和荷载方向协同作用的超大直径风电桩基承载机理与计算方法是海上风电资源开发利用面临的技术难题。因此，开展相关问题研究具有重要的理论与实际意义。本项目拟采用现场调查、室内试验、数值模拟与理论分析结合的方法，研究斜坡坡度、荷载方向、桩-土界面粗糙度特性、斜坡桩位、桩径及土层特性对超大直径桩基承载特性的影响，重点揭示斜坡和荷载方向协同作用的超大直径风电桩基承载机理。基于室内模型试验，建立不同PFC3D三维数值模型，深入探讨桩-土体系位移场与应力场分布规律与能量扩散边界计算方法。在此基础上，引入能量原理与突变理论，解决斜坡超大直径桩基桩土体系位移发展模式、能量扩散边界、能量方程建立、突变失稳类型与准则等关键问题，从而建立基于能量和变形控制的超大直径风电桩基承载力和变形计算新方法，并分析该计算方法适用条件与可靠性，完善斜坡和荷载方向协同作用的超大直径风电桩基设计计算理论，为工程设计提供参考。

Bearing mechanism and design theory of super large diameter pile foundation with synergistic action of slope and loading direction is a new task faced by the Marine wind power resources development and utilization. Therefore,study on relevant problems has a very important theoretical and practical significance. This project uses a combination of field investigation, laboratory test, numerical simulation and theoretical analysis methods, focusing on study of gradient of slope, loading direction, pile diameter, slope pile position, effect of pile - soil interface rough characteristics and soil properties on large diameter pile foundation bearing mechanism, reveals considering the coupling effect of slope and the loading direction on large diameter wind pile foundation bearing mechanism. This paper studies pile-soil system displacement field and stress field distribution and the calculation method of energy dispersive boundary by using PFC3D establishes different numerical calculation model based on indoor test data. On this basis, introducing energy principle and catastrophe theory to study large diameter pile in slope pile - soil system displacement development model, energy dispersive boundary , the energy equation’s building and catastrophe stability types and standards and other key issues respectively , then a bearing capacity and deformation calculation method of super large diameter wind pile foundation in slope will be set up , and analyzes the reliability of the applicable conditions of the method and the reliability of verifying theoretical method, finally proposes a set of super large diameter wind pile foundation design theory based on the energy and deformation control and provides a reference for relevant engineering design.