PREDICTIVE MODEL FOR LATERAL BEARING CAPACITY OF OFFSHORE WIND TURBINE FOUR-PILE FOUNDATION CONSIDERING STRAIN SOFTENING

Zhao Zihao; Zhu Enlin; Yu Daiguang; Luo Haidong; Zhou Han; Zhang Zhengfei

doi:10.19912/j.0254-0096.tynxb.2024-1287

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 730-740. DOI: 10.19912/j.0254-0096.tynxb.2024-1287

PREDICTIVE MODEL FOR LATERAL BEARING CAPACITY OF OFFSHORE WIND TURBINE FOUR-PILE FOUNDATION CONSIDERING STRAIN SOFTENING

Zhao Zihao^1~3, Zhu Enlin¹, Yu Daiguang⁴, Luo Haidong⁴, Zhou Han¹, Zhang Zhengfei¹

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Abstract

A three-dimensional finite element model of a four-pile foundation is established using ABAQUS software, and the strain softening constitutive relationship of soft clay is implemented through a VUMAT user subroutine. This study systematically investigates the influence of key parameters—such as the strain softening parameters δrem and ξ95, the strain rate parameter μ, pile spacing S, and pile length L—on the horizontal ultimate bearing capacity of a four-pile foundation, with a focus on revealing the dominant role of pile group interaction. Parametric analysis reveals that the horizontal bearing capacity factor increases with the strain softening parameters δ_rem and ξ₉₅ and the strain rate parameter μ, with notable differences in the degree of influence among these parameters. As the pile spacing and pile length increase, the pile group interaction weakens, resulting in a diminishing increase in the bearing capacity and a transition in failure mechanism. Finally, an artificial neural network-based prediction model for the horizontal bearing capacity of the four-pile foundation is established, incorporating the effects of multiple parameters.

Key words

wind turbines / clay / strain rate / pile foundation / horizontal bearing capacity / strain softening

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Zhao Zihao, Zhu Enlin, Yu Daiguang, Luo Haidong, Zhou Han, Zhang Zhengfei. PREDICTIVE MODEL FOR LATERAL BEARING CAPACITY OF OFFSHORE WIND TURBINE FOUR-PILE FOUNDATION CONSIDERING STRAIN SOFTENING[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 730-740 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1287

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