海上风机桩筒复合基础的水平承载性能分析  

Horizontal bearing capacity of pile-bucket composite foundation of offshore wind turbine

作　　者：周恩全[1] 许想 陆建飞[1] ZHOU Enquan;XU Xiang;LU Jianfei(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2022年第2期235-241,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51508236);江苏省自然科学基金资助项目(BK20150519);中国博士后基金资助项目(2015M580397);江苏大学高级人才科研启动基金资助项目(15JDG172)。

摘　　要：为了提高海上风机基础承载力,设计了一种筒型基础与钢管桩组合而成的桩筒复合基础,基于极限平衡方法提出了考虑不同桩数的桩筒复合基础水平承载力理论公式.建立了桩筒复合基础的有限元计算模型,分析了不同桩数、桩径、布置方式的桩筒复合基础水平承载性能.研究结果表明:保持用钢量不变,桩筒复合基础可以有效提高基础的极限承载力;相比单筒基础,单筒加1桩基础承载力提高44.27%,单筒加3桩基础承载力提高35.76%,单筒加4桩基础承载力提高34.73%;基础被动区一侧的地基土出现明显的楔形等效塑性应变,且等效塑性应变越明显,地基土分担的荷载比例越高,基础的承载力越高;基础的高应力区主要集中于基础顶盖部位.To improve the bearing capacity of offshore wind turbine foundation,a pile-bucket composite foundation with bucket foundation and steel piles was designed.Based on the limit equilibrium method,the theoretical formula of horizontal bearing capacity of pile-bucket composite foundation was proposed with considering different pile numbers.The finite element analysis model was established to analyze the bearing capacity of pile-bucket composite foundation with different pile numbers,pile diameters and arrangements.The results show that the ultimate bearing capacity of pile-bucket composite foundation can be effectively improved for the same steel amounts of foundation.Compared with single bucket foundation,the bearing capacity of bucket foundation with 1 pile is increased by 44.27%,and the bearing capacity of bucket foundation with 3 piles is increased by 35.76%,while the bearing capacity of bucket foundation with 4 piles is increased by 34.73%.Obvious wedge-shaped equilibrium plastic strain is appeared in the soil foundation of the passive area.The more obvious the equilibrium plastic strain is,the higher the load sharing ratio of foundation soil is,and the higher the bearing capacity of foundation is.The high stress area of foundation is mainly concentrated in the top cover of foundation.

关 键 词：海上风机 桩筒复合基础 地基土 承载力 等效塑性应变 

分 类 号：TU443[建筑科学—岩土工程]