Analysis of the Calculation Method of Axial Bearing Capacity of Steel Pipe Pile Foundation for Offshore Wind Power

In recent years, China’s offshore wind power industry has flourished. However, the construction cost of offshore wind farm is still high, which has become a key factor restricting its further development. In order to optimise the design size of offshore wind power foundation and reduce the construction cost of offshore wind farms, this paper compares and analyses five CPT and five CPTU calculation methods that are mainstream internationally applicable to the axial bearing capacity of pile foundation. Through the CPTU measured data of on-site geological investigation of two offshore wind power projects in Zhejiang and Jiangsu seas, the pile end resistance, pile side resistance and total bearing capacity of each test pile are calculated one by one to check the performance of these ten methods in terms of pile bearing capacity, and three evaluation criteria are used to check the applicability of these calculation methods. The results show that the three methods, Fugro, ICP and UWA, have significant advantages in the application in these two areas, among which the ICP method has certain accuracy and stability in the prediction of total lateral resistance.