海上风电复合桩基础体型优化及承载力特性研究-水利工程专业论文.docxVIP

ABSTRACT Presently, pile foundation is widely applied as a form of foundation for offshore wind turbines. And wind turbine foundation subjected to loads in the marine environment will be larger with the increase of the installed capacity of offshore wind turbines. In order to effectively control the horizontal displacement of pile foundation, the method of enlarging the pile diameter or increasing the depth of the buried pile will be taken in general. However, this method not only increases the steel tonnage of the pile, but also proposes a higher piling construction requirement, which leads to an elevated cost of the pile foundation, an increase in construction difficulty, as well as a growth in the construction cycle. Against this background, the proposing of composite pile foundation gives a good solution to these problems, and effectively reduces the cost of wind power development using pile foundation, which makes significant economic benefits. Composite pile foundation is a new form of offshore wind power foundation, which is composed of pile foundation and the cylindrical foundation mounted on the periphery of the pile body, whose unique form of structure makes the foundation have a good level of bearing performance. In this paper, composite pile foundation is taken as the research object, and the study is mainly about shape optimization of composite pile foundation and bearing characteristic of the foundation under lateral loads. Specific details go as follows: The structure form and construction process of composite pile foundation are described, as well as the great advantages in bearing performance of composite pile foundation under lateral loads. Composite pile foundation is suitable for high-power offshore wind power generators, which is well suited to the development trend of offshore wind power. According to Winkler assumption, for composite pile foundation under horizontal loads, distributed forms of soil resistance on the side of the foundation, as