STUDY ON TIME-DEPENDENT OF BEARING CAPACITY OF OFFSHORE LARGE-DIAMETER MONOPILES

To improve the accuracy of predicting the bearing capacity of offshore large-diameter monopiles, the initial high strain detection and repeated high strain detection with an interval of 10-84 days were carried out on 6 large-diameter monopiles with a diameter of 7.2m-7.4m in the offshore wind field dominated by clay soil layer. The results show that the time-dependent increment of tip resistance, side resistance and the total resistance of large-diameter monopiles in the same offshore wind farm has great discreteness, and the axial force increment of monopiles has a consistent change trend. This paper puts forward the prediction interval of 95% guarantee rate of bearing capacity increment of the offshore large-diameter monopiles based on depth, which provides a basis for the design of large-diameter monopiles.