BEARING PERFORMANCE OF MONO-COLUMN COMPOSITE BUCKET FOUNDATION FOR OFFSHORE WIND POWER UNDER SCOUR EVOLUTION

Ni Daojun; Xiao Jiandong; Xiao Yaoyao; Qi Xin; Zhang Puyang

doi:10.19912/j.0254-0096.tynxb.2024-1652

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 576-583. DOI: 10.19912/j.0254-0096.tynxb.2024-1652

BEARING PERFORMANCE OF MONO-COLUMN COMPOSITE BUCKET FOUNDATION FOR OFFSHORE WIND POWER UNDER SCOUR EVOLUTION

Ni Daojun¹, Xiao Jiandong², Xiao Yaoyao³, Qi Xin⁴, Zhang Puyang⁴

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Abstract

The mono-column composite bucket foundation is an innovative foundation structure developed in China and has been applied in several offshore wind power projects. However, the assessment of its bearing performance under scour conditions remains insufficiently understood. In this study, finite element analysis was first conducted to evaluate the bearing capacity of the mono-column composite bucket foundation under different loading directions and to examine the influence of scour on the natural frequency and stiffness of the foundation, thereby identifying the most unfavorable scour condition. The bearing behavior of the foundation under different scour conditions was then investigated under Tianjin clay-covered soil conditions. The research results indicate that variations in the loading direction relative to the scoured zone and in scour pattern alter the surrounding soil morphology and consequently affect the ultimate bearing capacity, bending moment, and inclination response of the structure to different degrees. As the scour depth increases from 2 m to 10 m, the lateral stiffness of the foundation decreases by about 15%, while its natural frequency decreases by 7%-8%. Scour extending into deeper soil layers reduces the structural bearing capacity, although the reduction is limited. Complete scour causes a greater decrease in bearing capacity than one-sided scour. Under cyclic loading, the adverse effect of scour on the structural response becomes more pronounced.

Key words

offshore wind power / scour / bearing capacity / composite bucket foundation / load-displacement curve / frequency and stiffness

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Ni Daojun, Xiao Jiandong, Xiao Yaoyao, Qi Xin, Zhang Puyang. BEARING PERFORMANCE OF MONO-COLUMN COMPOSITE BUCKET FOUNDATION FOR OFFSHORE WIND POWER UNDER SCOUR EVOLUTION[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 576-583 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1652

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