孙艳国, 许成顺, 杜修力, 王丕光, 孙毅龙. 海上风电桩-筒复合基础承载性能研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2022.02.11.003
引用本文: 孙艳国, 许成顺, 杜修力, 王丕光, 孙毅龙. 海上风电桩-筒复合基础承载性能研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2022.02.11.003
Bearing characteristics of composite foundations for offshore wind turbines[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2022.02.11.003
Citation: Bearing characteristics of composite foundations for offshore wind turbines[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2022.02.11.003

海上风电桩-筒复合基础承载性能研究

Bearing characteristics of composite foundations for offshore wind turbines

  • 摘要: 合理高效地利用海上风电资源是实现“碳中和”的有效方法之一,随着海上风电资源的开发逐渐向深远海延伸,海上风电基础的承载性能受到越来越广泛的关注,众多学者探索新型复合基础以满足海上风电场的发展需求。本文基于有限元软件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、弯矩荷载M作用下不同筒结构尺寸的桩-筒复合基础的承载性能,并采用正交试验法开展桩-筒复合基础的水平承载性能、竖向承载性能和抗弯承载性能的影响因素研究。结果表明,饱和黏土的不均匀程度系数K对竖向承载力系数NcV影响较小,同一基础在不同系数K时,NcV值波动范围较小;饱和黏土不均匀程度系数K对水平承载力系数NcH和抗弯承载力系数NcM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。筒结构直径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D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-筒复合基础设计提供了依据。

     

    Abstract: Offshore wind power has been the fastest growing form of renewable energy for the last few years. It is reasonable and efficient utilization of offshore wind power resources that is one of the effective means to achieve carbon neutrality. With the offshore wind farms gradually developing into deep and far sea, attentions are paid to the bearing characteristics of foundations for offshore wind turbines more and more. Therefore, it becomes significantly important to explore new foundations, which can effectively promote the development of offshore wind power. In order to provide assistance for offshore wind farms construction, numbers of researcher have made a lot of contributions to study new foundations for offshore wind turbines. A series of numerical calculation models for pile-bucket composite foundations in heterogeneous saturated clay are established by the finite element software ABAQUS in this paper. It is compared that the bearing characteristics of pile-bucket foundations in different heterogeneous saturated clays under vertical loading V, horizontal loading H, and bending moment M. And the priority of influencing factors is studied through the orthogonal test. The results show that saturated clay coefficient K has little effect on vertical bearing capacity coefficient NcV. Saturated clay coefficient K is different, but the size of the vertical bearing capacity coefficient NcV is almost unchanged for a certain foundation. There is a great interaction between the diameter D and the buried depth L of the bucket structure, when it comes to the impact of bucket shapes on bearing capacity coefficient in the three directions. It is easily perceived that the diameter D of the bucket has a greatest influence on the bearing characteristics of the pile-bucket composite foundations. Therefore, the bearing characteristics of the composite foundations can be effectively improved by increasing the diameter D of the bucket. The research results provide a reference for the design of the pile-bucket composite of offshore wind turbine.

     

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