STUDY ON SHEAR CHARACTERISTICS OF INTERFACE BETWEEN OFFSHORE WIND TURBINE STEEL PILES AND SAND

Zhao Zihao; Wang Zhitong; Luo Haidong; Huang Kaixiang; Cao Yazheng; Tang Yongqiang

doi:10.19912/j.0254-0096.tynxb.2024-1943

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (3) : 290-298. DOI: 10.19912/j.0254-0096.tynxb.2024-1943

STUDY ON SHEAR CHARACTERISTICS OF INTERFACE BETWEEN OFFSHORE WIND TURBINE STEEL PILES AND SAND

Zhao Zihao¹, Wang Zhitong¹, Luo Haidong², Huang Kaixiang¹, Cao Yazheng¹, Tang Yongqiang¹

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Abstract

Steel pile jacket foundations are widely used in offshore wind power engineering, where the mechanical properties of the soil-steel pile interface largely determine the bearing capacity of the foundation. In this study, based on a self-developed interface shear testing apparatus and PFC （particle flow code） discrete element numerical simulations, three types of structural planes with different morphological characteristics were examined under identical roughness conditions to investigate the influence of surface topography on the shear characteristics of the sand-steel interface. The results indicate that： 1） The mechanical behavior of interfaces with different morphologies exhibits similar trends with increasing roughness. Both peak shear stress and interface efficiency increase with roughness until reaching a critical roughness value, which corresponds to a morphological depth equal to D₅₀ （median grain size）. Beyond this critical point, shear stress and interface efficiency change gradually. 2） When the morphological depth is small, different structural surface topographies significantly affect peak interface shear stress, with the maximum difference occurring at the critical roughness. As morphological depth increases, the influence of different structural surface topographies diminishes, and peak shear stresses converge to similar values. 3） Shear band thickness increases with morphological depth and then stabilizes as depth continues to increase. Furthermore, structural surface with a greater number of grooves exhibit larger shear band thicknesses.

Key words

offshore wind power / interface roughness / shear band / particle flow code（PFC） / structural surface morphology / sand-steel interface

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Zhao Zihao, Wang Zhitong, Luo Haidong, Huang Kaixiang, Cao Yazheng, Tang Yongqiang. STUDY ON SHEAR CHARACTERISTICS OF INTERFACE BETWEEN OFFSHORE WIND TURBINE STEEL PILES AND SAND[J]. Acta Energiae Solaris Sinica. 2026, 47(3): 290-298 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1943

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