摘要
桩-筒组合基础是将单桩基础与筒型基础组合的一种新型海上风电基础形式,其受力模式不同于传统桩基基础,优点是可通过合理减小桩长、桩壁厚等途径提高承载性能。基于极限地基反力法,提出单层黏土中桩-筒组合基础受力模式及水平承载力的计算方法。利用力加载和位移加载两种控制方法进行数值分析,研究水平承载性能的影响因素。结果表明,在一定范围内,桩-筒组合基础水平承载性能随桩入土深度、桩壁厚、筒外径的增大而提高。基于实际工程,对等用钢量的单桩基础与组合基础进行比较计算,结果表明,桩-筒组合基础可有效降低基础倾斜度和位移,提高承载性能。
Pile-bucket foundation is a new type of foundation for offshore wind turbines, which is a combination of pile foundation and bucket foundation. Compared to the traditional pile foundation, the pile-bucket foundation changes the mode of bearing capacity which is improved by reducing the length and thickness of the pile. Based on the subgrade reaction method, the mechanical mode and the method which is used for evaluating horizontal bearing capacity are proposed. Based on the force and displacement control process, the influencing factors for horizontal bearing capacity behavior are analyzed and compared. The results show that the theoretical calculation results agree well with the FE results. It is found that the horizontal bearing capacity increases with the increasing of the depth of pile, the thickness of pile and the diameter of bucket. Based on the actual project and compared to the pile foundation, the levelness and displacement of the pile-bucket foundation is low and the bearing performance is good when they are under the same weight. The pile-bucket foundation will be destroyed by rotating around a point under the ultimate loads.
出处
《海洋工程》
CSCD
北大核心
2014年第2期30-37,共8页
The Ocean Engineering
基金
国家自然科学基金资助项目(51109160)
863高技术研究发展计划资助项目(2012AA051705)
国家国际科技合作专项项目(2012DFA70490)
天津市应用基础与前沿技术研究计划(自然科学基金青年项目)(13JCQNJC06900)
关键词
桩-筒组合基础
水平承载性能
理论分析
有限元分析
pile-bucket foundation
horizontal bearing capacity
theoretical analysis
finite element analysis
