海上风电桩-筒复合基础承载性能研究  

Bearing characteristics of pile-bucket composite foundations for offshore wind turbines

作　　者：孙艳国 许成顺[1] 杜修力[1] 王丕光[1] 席仁强 孙毅龙 SUN Yan-guo;XU Cheng-shun;DU Xiu-li;WANG Pi-guang;XI Ren-qiang;SUN Yi-long(Key Laboratory of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,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

出　　处：《工程科学学报》2023年第3期489-498,共10页Chinese Journal of Engineering

基　　金：国家自然科学基金优秀青年基金资助项目(51722801)。

摘　　要：基于有限元软件ABAQUS平台,建立了非匀质饱和黏土场地的海上风电桩–筒复合基础数值计算模型,对比研究竖向荷载V、水平荷载H和弯矩荷载M作用下不同筒结构尺寸的桩–筒复合基础的承载力系数,并采用正交试验法开展桩–筒复合基础的各向承载性能的影响因素研究.结果表明,饱和黏土的非匀质特性系数K对竖向承载力系数N_(cV)影响较小;K对水平承载力系数N_(cH)和抗弯承载力系数N_(cM)的影响呈指数型递减.筒结构直径D和入土深度L对各向承载力系数的影响存在交互作用.D对桩–筒复合基础承载力系数的影响最大,可以通过增加筒结构直径从而有效地提高桩–筒复合基础的承载性能.研究结果为海上风电桩–筒复合基础的设计提供了依据.Offshore wind power has been the fastest-growing form of renewable energy for the last few years,owing to its effectiveness in achieving carbon neutrality through a reasonable and efficient utilization of wind power resources.With offshore wind farms gradually developing into the deep and far sea,greater attention is paid to the bearing characteristics of foundations for offshore wind turbines.Therefore,it becomes significantly important to explore new foundations,effectively promoting the development of offshore wind power.Numerous researchers have substantially investigated novel foundations for offshore wind turbines to help with offshore wind farm construction.Compared to other foundations,the pile–bucket composite foundation has obvious advantages in terms of bearing performance.In this paper,a series of numerical calculation models for pile–bucket composite foundations in heterogeneous saturated clay are established using the finite element software ABAQUS.Additionally,the undrained shear strength changes with depth are examined via field variables to explain soil heterogeneity in the finite element model.Next,the displacement control method is adopted to apply the vertical loading V,horizontal loading H,and bending moment M at the top of the foundation.Simultaneously,the ultimate bearing capacity of the foundations is obtained by the double tangent method,and the bearing capacity factors of each load direction are obtained by normalizing the ultimate bearing capacity in different calculations.To obtain the preliminary design method for the size of pile–bucket composite foundation,the priority of influencing factors is studied through the orthogonal test.The results show that the saturated clay coefficient K has a nominal effect on the vertical bearing capacity coefficient N_(cV).When K is different,N_(cV) remains almost unchanged for a certain foundation.Concerning the impact of bucket shapes on the bearing capacity coefficient in three directions,great interaction is observed between the diameter D

关 键 词：海上风电 桩–筒复合基础 非匀质饱和黏土 承载力系数 正交试验 

分 类 号：TU47[建筑科学—结构工程]