砂土地基海上风电大直径单桩基础的p-y曲线研究

刘畅博; 胡中波; 李阔; 刘欣怡; 田德帅; 史楠

doi:10.19912/j.0254-0096.tynxb.2023-0367

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太阳能学报 ›› 2024, Vol. 45 ›› Issue (7) : 704-711. DOI: 10.19912/j.0254-0096.tynxb.2023-0367

砂土地基海上风电大直径单桩基础的p-y曲线研究

刘畅博, 胡中波, 李阔, 刘欣怡, 田德帅, 史楠

作者信息 +

STUDY OF p-y CURVES OF LARGE-MONOPILES FOR OFFSHORE WIND POWER IN SAND

Liu Changbo, Hu Zhongbo, Li Kuo, Liu Xinyi, Tian Deshuai, Shi Nan

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文章历史 +

摘要

依托福建某海上风电项目现场试验,对大直径单桩有限元模型的有效性进行验证,进一步研究砂土地基中不同桩径大直径单桩的破坏模式、初始刚度、极限抗力随桩径与深度的变化规律,并分别考虑桩径的尺寸效应与埋深对双曲线模型进行修正。结果表明：不同桩径下大直径单桩的破坏模式主要为浅层土体的楔形破坏;API规范、双曲线模型计算得到的p-y（地基土水平抗力-桩水平位移）曲线与数模得到的p-y曲线误差较大,而修正双曲线模型与数模结果吻合较好,优于其他模型的计算结果。

Abstract

Monopile foundation is the common form in current offshore wind power, and the p-y curve recommended by API is commonly used to obtain the lateral loading of a monopile at present, but it is not applicable to large diameter monopile foundation. The validity of the finite element model of large diameter monopile was verified by an offshore wind power test pile in Fujian, and the damage mode of large diameter monopile and the variation of initial stiffness and ultimate resistance with pile diameter and depth in sand were studied by numerical simulation, and the equations were modified by considering the size effect of pile diameter and burial depth respectively, and finally a modified hyperbolic model was proposed to calculate the p-y curve in sand. The results show that the damage modes of monopiles with different diameters are wedge-shaped damage of shallow soils; the p-y curve calculated by API and hyperbolic model has a large error with the p-y curve obtained by numerical model, while the modified hyperbolic model agrees well with the numerical model results, which can provide reference for the calculation of lateral loading of large-diameter monopiles for offshore wind power in sand.

导出引用

刘畅博, 胡中波, 李阔, 刘欣怡, 田德帅, 史楠. 砂土地基海上风电大直径单桩基础的p-y曲线研究[J]. 太阳能学报. 2024, 45(7): 704-711 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0367

Liu Changbo, Hu Zhongbo, Li Kuo, Liu Xinyi, Tian Deshuai, Shi Nan. STUDY OF p-y CURVES OF LARGE-MONOPILES FOR OFFSHORE WIND POWER IN SAND[J]. Acta Energiae Solaris Sinica. 2024, 45(7): 704-711 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0367

中图分类号： TU473.1

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