NUMERICAL STUDY FOR EFFECTS OF CLAY NONLINEAR SMALL-STRAIN STIFFNESS ON CONE PENETRATION IN OFFSHORE WIND POWER

Zhang Zuguo; Zhu Junlin; Shen Kanmin

doi:10.19912/j.0254-0096.tynxb.2024-1375

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 653-661. DOI: 10.19912/j.0254-0096.tynxb.2024-1375

NUMERICAL STUDY FOR EFFECTS OF CLAY NONLINEAR SMALL-STRAIN STIFFNESS ON CONE PENETRATION IN OFFSHORE WIND POWER

Zhang Zuguo, Zhu Junlin, Shen Kanmin

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Abstract

The current interpretation methods for the cone penetration test (CPT), which is used to obtain in-situ parameters of clay in offshore wind power investigations, are based on the elastic-perfectly plastic soil model and do not adequately account for the small-strain nonlinear stiffness characteristics of clay. This paper conducts numerical studies to investigate the impact of clay stress-strain nonlinearity and small-strain parameters on cone tip resistance. Saturated clays are modeled using the hyperbolic hardening elastoplastic model and the small-strain elastoplastic constitutive model, simulating the cone penetration process within the ABAQUS finite element software framework. To mitigate mesh distortion during large deformation analyses, the Arbitrary Lagrangian Eulerian （ALE） remapping technique is adopted. Finite element numerical simulations indicate that soil stiffness, in-situ stress of soil strata, cone surface roughness, and failure criteria significantly influence the cone bearing factor. Moreover, an increased soil failure ratio corresponds to a decreased cone factor. Importantly, accounting for small-strain stiffness leads to a marked augmentation of the cone factor, with the extent of this increase being closely related to the interplay among small-strain stiffness, reference shear strain, and large-strain stiffness. Finally, the proposed method for evaluating the cone factor, which incorporates the small-strain stiffness of clay, is validated through a field engineering case, demonstrating robust applicability.

Key words

offshore wind farms / cone penetration test / soft clay / large deformation finite element / small-strain stiffness / cone factor

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Zhang Zuguo, Zhu Junlin, Shen Kanmin. NUMERICAL STUDY FOR EFFECTS OF CLAY NONLINEAR SMALL-STRAIN STIFFNESS ON CONE PENETRATION IN OFFSHORE WIND POWER[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 653-661 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1375

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