新型工艺下的海上风电导管架基础水动力数值仿真与风险分析

提出一种利用半潜驳进行导管架基础立式运输安装的新型施工工艺,采用半潜驳下潜为导管架基础提供向上浮力以减小吊机起吊力的方式解决现场设备适用性的难题。基于该新型运输安装工艺,采用三维势流理论建立半潜驳运输安装导管架基础的水动力模型,通过数值仿真研究下潜深度与有义波高等因素变化对导管架基础-半潜驳系统运动及受力的影响规律,对半潜驳下潜作业进行风险分析,论证半潜驳运输安装导管架基础的可行性,确定半潜驳运输安装导管架基础下潜作业时允许横摇角,对半潜驳安全作业环境工况进行限定,以期为导管架基础新型运输安装工艺提供科学依据和技术支持。

HYDRODYNAMIC NUMERICAL SIMULATION AND RISK ANALYSIS OF OFFSHORE WIND POWER JACKET FOUNDATION UNDER NEW CONSTRUCTION TECHNOLOGY

In this paper, a new construction technology of transportation and installation for jacket foundation by semi-submersible barge in vertical transportation is proposed, which provides upward buoyancy for jacket foundation through the diving process of the semi-submersible barge, thus reducing the lifting force of crane, and solving the applicability problem of field crane. Based on this new construction technology, the hydrodynamic model of jacket foundation for semi-submersible barge transportation and installation is established by using 3D potential flow theory. Through numerical simulation, the influence of diving depth, significant wave on the movement and force of jacket foundation & semi-submersible barge system is studied. In order to demonstrate the feasibility of transportation and installation of jacket foundation in semi-submersible barge, the risk analysis of diving operation of semi-submersible barge is carried out. The allowable roll angle of diving operation for the jacket foundation of semi-submersible barge transportation and installation is put forward, which limits the safe working conditions of semi-submersible barge and provides scientific basis and technical support for the new construction technology of jacket foundation transportation and installation.