基于现场试验的海上风电大直径钢管桩p-y曲线特性分析  

Characterization of p‐y curve for a large-diameter steel pipe pile based on field test

作　　者：马美玲 李立辰 吴文兵 刘浩 罗仑博 梅国雄 MA Meiling;LI Lichen;WU Wenbing;LIU Hao;LUO Lunbo;MEI Guoxiong(Engineering Research Centre of Rock-Soil Drilling&Excavation and Protection,Ministry of Education,Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Science and Technology Research Institute,China Three Gorges Corporation,Beijing 100038,China;Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]中国地质大学(武汉)工程学院岩土钻掘与防护教育部工程研究中心,湖北武汉430074 [2]中国长江三峡集团有限公司科学技术研究院,北京100038 [3]浙江大学海洋学院,浙江舟山316021

出　　处：《海洋工程》2024年第5期44-53,共10页The Ocean Engineering

基　　金：国家自然科学基金面上项目(52178371);中国博士后科学基金面上项目(2022M712964);岩土钻掘与防护教育部工程研究中心开放项目(202203)。

摘　　要：作为美国石油协会(API)推荐的规范方法,p-y曲线法在水平受荷桩的计算分析中得到了广泛应用。随着海上单桩基础尺寸的增大,基于柔性长桩得出的API规范p-y曲线的适用性受到了越来越多的质疑。以中国某海上风电场大直径单桩基础水平静载试验为工程背景,分析了试桩的水平受荷变形特性。基于实测数据,对比了4种较为常见的p-y曲线方法的计算效果。结合三维有限元模拟分析了基础尺寸对p-y曲线形式的影响,并探讨了上述p-y曲线的适用工况。结果表明:API法不适用于大直径桩的分析计算;4种方法中,Sullivan法的预测值与实测值最为吻合。同时根据现场试验与有限元分析的结果提出了修正的p-y曲线计算方法。文中研究成果能为相似海域内大直径单桩水平承载变形特性设计提供一定参考。As the recommended standard method by the American Petroleum Institute(API),the p‐y curve method has been widely used in the calculation and analysis of horizontally loaded piles.With the increase in the size of offshore single pile foundations,the applicability of the API standard p‐y curves derived based on flexible long piles has been increasingly questioned.Taking the horizontal static load test of a large‑diameter single pile foundation in a certain offshore wind farm in China as the engineering background,this paper analyzes the horizontal load-deformation characteristics of the test piles.Based on the measured data,the calculation effects of four commonly used p‐y curve methods are compared.Combined with the three-dimensional finite element simulation,the influence of foundation size on the form of the p-y curves is analyzed,and the applicable working conditions of the above p‐y curves are discussed.The results show that the API method is not suitable for the analysis and calculation of large-diameter piles.Among the four methods,the predicted values of the Sullivan method are most consistent with the measured values.Based on the results of field tests and finite element analysis,a modified p-y curve calculation method is proposed.The research results of this paper can provide a certain reference for the design of the horizontal bearing and deformation characteristics of large-diameter single piles in similar sea areas.

关 键 词：海上风电 大直径单桩 现场试桩 P-Y曲线 

分 类 号：P752[天文地球—海洋科学] TU473.1[建筑科学—结构工程]