海上风电大直径单桩的修正p-y曲线模型

单桩基础是当前海上风电常用的基础形式,常采用API规范推荐的p-y曲线对单桩的水平位移进行分析计算.当单桩基础桩径大于2 m时,API推荐的p-y曲线模型高估了初始地基刚度,引起桩基水平位移计算结果不准确.因此,分析现有p-y曲线法高估初始地基刚度的主要因素;对p-y曲线模型中的关键参数进行修正;根据FLAC3D数值模...

A MODIFIED p-y CURVE MODEL OF LARGE-MONOPILES OF OFFSHORE WIND POWER PLANTS

The monopile is one of the most common solutions for the foundation of offshore wind power plants.The p-y curve recommended by API is commonly used to obtain the horizontal displacement of a monopile. For piles of a more than 2 m diameter, the p-y curve model overestimates the initial stiffness of subgrade reaction and yields inaccurate horizontal displacement. An evaluation of the current p-y method was made to obtain the key factors responsible for overestimating the initial stiffness of subgrade reaction. These key factors were amended.A modified p-y curve model was proposed in which the nonlinear impact of the dimeter and depth on the initial stiffness K was considered based on the calculation results of FLAC3 D. The developed p-y curve model was compared with test data and the results of the current p-y curve and the previous modified model. The results show that the good agreement between the calculated results of the developed modified p-y model and test values verified the rationality of the modified p-y model.