LATERAL BEARING BEHAVIOR OF PILE-BUCKET HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES IN SAND

Fan Qinglai; Fan Ge; Yin Jiaqi; Li Xiang

doi:10.19912/j.0254-0096.tynxb.2025-0455

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (7) : 231-239. DOI: 10.19912/j.0254-0096.tynxb.2025-0455

LATERAL BEARING BEHAVIOR OF PILE-BUCKET HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES IN SAND

Fan Qinglai, Fan Ge, Yin Jiaqi, Li Xiang

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Abstract

The mechanical response of pile-bucket hybrid foundations subjected to horizontal loading is systematically investigated using three-dimensional nonlinear finite element analyses. Firstly, the existing centrifuge model test is numerically simulated, and the calculated results are in good agreement with the relevant experimental data. Then the effects of bucket size, soil strength parameters and horizontal load eccentricity on the horizontal bearing capacity of pile-bucket hybrid foundations are analyzed, revealing the failure mode and load-sharing mechanism of pile-bucket hybrid foundations in sand. The results indicate that the failure mode of the pile-bucket hybrid foundation is mainly rotational instability. The horizontal bearing capacity of the foundation increases with the increase of the bucket diameter. The trend of increasing horizontal bearing capacity with the increase of bucket height becomes less obvious when the bucket height exceeds 1.5 times the pile diameter. In the pile-bucket hybrid foundation, the bucket component primarily bears the horizontal force, while the pile component mainly withstands the bending moment. It is more advantageous to exert the horizontal resistance capacity of the bucket component in denser sand. Through data fitting of numerical simulation results, a lateral bearing capacity prediction formula is proposed that incorporates bucket dimensions, sand strength parameters, and load eccentricity.

Key words

offshore wind power / bearing capacity / numerical analysis / pile-bucket hybrid foundation / sand / load sharing mechanism / failure mode

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Fan Qinglai, Fan Ge, Yin Jiaqi, Li Xiang. LATERAL BEARING BEHAVIOR OF PILE-BUCKET HYBRID FOUNDATIONS FOR OFFSHORE WIND TURBINES IN SAND[J]. Acta Energiae Solaris Sinica. 2026, 47(7): 231-239 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0455

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