Introduction  At present, in China's offshore wind power projects, with the gradual development of the far-reaching sea, the most commonly used foundation structure of wind turbine is the pile foundation, and the most commonly used superstructure is the jacket structure. The combination of the two constitutes the basic support system of wind turbine. In some shallow cover areas of deep water, the application demand of large diameter jacket foundation is particularly strong, and the design of the lower pile foundation directly determines the feasibility of the scheme and the safety of the structure. In order to verify the bearing capacity of the large diameter short pile foundation of the jacket, the calculation method of CPTU is proposed.

  Method  Through the UWA-05 method recommended in the CPTU calculation method of API specification, the bearing capacity was calculated, and the actual measurement of high strain data of a wind field in Guangdong and the formula calculation results were further analyzed, and the parameters of the end resistance of the formula itself were quite different.

  Result  The results show that the CPTU method is used to fit the side resistance with the measured data. It is difficult to form an effective soil plug for the large diameter short pile of the jacket. When calculating the end resistance by using the CPTU method, it is recommended to consider only the end ring area.

  Conclusion  Therefore, it is a reliable method to calculate the bearing capacity of large diameter short pile in jacket, but it is suggested to compare and verify the data of test pile, so as to provide reference for the subsequent application of large diameter short pile in far-reaching sea breeze field.