海上风电大直径单桩的修正p-y曲线模型  

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

作　　者：孙毅龙 许成顺[1] 杜修力[1] 杜秀萍[2] 席仁强 SUN Yi-long;XU Cheng-shun;DU Xiu-li;DU Xiu-ping;XI Ren-qiang(Key Laboratory of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,China;Water Conservancy and Hydropower Investigation and Design Institute of Baoding,Baoding,Hebei 071000,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]保定市水利水电勘测设计院,河北保定071000

出　　处：《工程力学》2021年第4期44-53,共10页Engineering Mechanics

基　　金：国家自然科学基金优秀青年基金项目(51722801);国家自然科学基金创新群体项目(51421005)。

摘　　要：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数值模拟计算结果,引入桩径大小、土体深度对初始地基刚度K的影响,建立修正p-y曲线模型。在此基础上,开展三个案例分析对建立的修正p-y曲线进行验证,与现有的p-y曲线、已有的修正模型对比;结果表明建立的修正p-y曲线模型的计算结果与试验实测值吻合较好,验证了建立的修正模型的合理性。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.

关 键 词：海上风电 单桩基础 桩径 土体深度 p-y曲线模型 

分 类 号：TU473.1[建筑科学—结构工程]