STUDY ON CORRECTED p-y CURVE MODEL OF PILE FOUNDATION OF OFFSHORE WIND TURBINES

Zhang Xiaoling; Zhou Rui; Xu Chengshun

doi:10.19912/j.0254-0096.tynxb.2022-1389

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (12) : 290-297. DOI: 10.19912/j.0254-0096.tynxb.2022-1389

STUDY ON CORRECTED p-y CURVE MODEL OF PILE FOUNDATION OF OFFSHORE WIND TURBINES

Zhang Xiaoling^1,2, Zhou Rui^1,2, Xu Chengshun^1,2

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Abstract

Pile foundation is widely used in offshore wind turbines. At present, when the soil structure interactions and the horizontal displacement of pile foundation are analyzed, the p-y curve model recommended by American Petroleum Institute specification is often adopted for calculation. With the development of soil structure theory, when the p-y curve model recommended by the existing API specification is applied to the analysis and calculation of large diameter piles foundation, the results of the ultimate soil resistance at different depths is underestimated and the initial foundation reaction modulus is overestimated, thus the accuracy of calculation is reduced. As to this problem, the factors that affect the ultimate soil resistance and initial foundation reaction modulus in the existing p-y curve model are analyzed in this study. A finite element numerical model of soil structure interactions are established, and the calculation models with different pile diameters and soil depths are discussed and the data regression is carried out. A correction coefficient is introduced to consider the size effect of large diameter pile foundation, and the variation law of influence index of different factors is examined. Finally, a corrected p-y curve model for pile foundation with large diameter is proposed. Compared with the results of model test and field test, the calculation of ultimate soil resistance and initial foundation reaction modulus of the corrected model is more consistent with the actual situation, and the reliability and rationality of the corrected p-y curve model are verified.

Key words

offshore wind turbines / pile foundations / soil structure interactions / size effect / corrected p-y curve

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Zhang Xiaoling, Zhou Rui, Xu Chengshun. STUDY ON CORRECTED p-y CURVE MODEL OF PILE FOUNDATION OF OFFSHORE WIND TURBINES[J]. Acta Energiae Solaris Sinica. 2023, 44(12): 290-297 https://doi.org/10.19912/j.0254-0096.tynxb.2022-1389

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