Study on Horizontal Loading of Large Diameter Single Pile of Offshore Fan on Soft Clay Seabed Foundation

Abstract


 Vigorously developing offshore wind power is an important measure to achieve China's "dual carbon" goal. For offshore wind turbines, the foundation embedded in the seabed is directly related to the safety and stability of the wind turbine, and is the most important part of wind power design. At present, in the offshore wind power construction within 40 m, large diameter single pile foundation is the most widely used foundation form. For the design of single pile foundation, it is necessary to ensure that the ultimate load of foundation can withstand the most extreme external load. Secondly, it is necessary to ensure that during the 25-year service period of the fan, the cumulative deformation of a single pile at the mud surface under the cyclic load of wind and waves does not exceed the value specified in the code; Finally, it is necessary to ensure that the wind power structure does not occur fatigue damage under the action of reciprocating dynamic load. Such strict design criteria, coupled with the soft clay seabed with poor mechanical properties widely distributed in the sea area of China's wind farms, bring severe challenges to the design of single piles.