Abstract: In order to solve the design problems of offshore photovoltaic power plants under complex working conditions, taking the 300 000 kW offshore photovoltaic project in Changli, Qinhuangdao as a case study, this paper focuses on the key technology of integrated design and installation of a fixed pile foundation type. By analyzing key parameters such as sea ice force, wave load, and sea current force in the Bohai Sea, multiple loads are combined, and the fixed pile foundation type scheme is modeled. The bearing characteristics of the pile foundation are analyzed, and the economic and reliability of the steel pipe pile and steel grid combination scheme considering sea ice effect are verified. The research results indicate that: 1) The results of limiting ice force by sea ice strength under different pile diameters show a linear positive correlation between pile diameter and ice force, and sea ice load is the controlling factor for the pile foundation design of this project. 2) Based on load combinations and modeling results, using steel pipe piles as the foundation of the photovoltaic platform, the bearing capacity of each section of the pile body meets the requirements. This study has verified the effectiveness of the method through engineering practice, providing a technical paradigm for large-scale development of offshore photovoltaics and a scientific basis for the design of photovoltaic power stations in high latitude sea areas.

Key words: ocean engineering structure and construction, offshore photovoltaics, sea ice load, wave load, bearing capacity of pile foundation

摘要： 为了解决海上复杂工况下的海上光伏电站设计问题,以秦皇岛昌黎30万千瓦海上光伏项目为案例,聚焦桩基固定式设计安装一体化关键技术,通过分析渤海海域海冰作用力、波浪荷载及海流力等关键参数,组合多种荷载,并对桩基固定式方案进行建模,分析了桩基承载特性,验证了考虑海冰作用下的钢管桩与钢网架组合方案的经济性与可靠性。研究结果表明:1)不同桩径下海冰强度限制冰力的结果显示桩径与冰力呈线性正相关,海冰荷载为该项目桩基设计的控制因素;2)根据荷载组合和建模结果,该项目采用钢管桩作为光伏平台基础,各段桩身承载力均满足要求。该研究通过工程实践验证了方法的有效性,为海上光伏大规模开发提供了技术范式,为高纬度海域光伏电站设计提供了科学依据。

关键词: 海洋工程结构与施工, 海上光伏, 海冰载荷, 波浪荷载, 桩基承载力