波浪荷载下海上风力机桩基础滞回效应及水平承载力变化特性研究

姜彤; 何天乐; 王璇; 王静

doi:10.19912/j.0254-0096.tynxb.2023-0579

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太阳能学报 ›› 2024, Vol. 45 ›› Issue (8) : 546-553. DOI: 10.19912/j.0254-0096.tynxb.2023-0579

波浪荷载下海上风力机桩基础滞回效应及水平承载力变化特性研究

姜彤, 何天乐, 王璇, 王静

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STUDY ON HYSTERETIC EFFECT AND HORIZONTAL BEARING CAPACITY OF PILE FOUNDATION FOR OFFSHORE WIND TURBINE UNDER WAVE LOAD

Jiang Tong, He Tianle, Wang Xuan, Wang Jing

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摘要

该研究以海上风电桩基础为研究对象,采用自主设计的水平加载装置模拟波浪荷载,结合粒子图像测速（PIV）技术开展缩尺模型试验。着重探究不同幅值的波浪荷载加载过程中,桩周土体的循环变形特征及加载前后,海上风力机桩基础水平承载能力变化。试验结果表明：桩顶累积转角随加载次数呈线性增长、缓慢增长和稳定发展的三阶段变化特性;桩周土体呈现典型的刚性桩两区域破坏形式,桩右被动区土体位移矢量场和位移云图影响范围受加载幅值变化影响显著;桩顶循环加载荷载位移曲线表现出明显的滞回性,滞回圈随加载次数右移并产生累积位移。伴随着滞回圈面积减小和割线刚度增大,桩周土体由以塑性变形向弹性变形为主导变化;循环加载后的滞回圈有明显捏缩,耗能能力减弱。桩基础水平承载能力及弹性变形能力较加载前均明显提高。

Abstract

Taking offshore wind power pile foundation as the research object and using the self-designed horizontal loading device to simulate wave load and using particle image velocimetry (PIV) technique to carry out scaled model tests, the cyclic deformation characteristics of soil around the pile and the variation of horizontal bearing capacity of offshore wind turbine pile foundation before and after loading were studied in this study. The results reveal that the cumulative rotation angle of pile top exhibits a three-stage variation characteristic of linear growth, slow growth and steady development with the number of loading. The soil around pile exhibits a classic two-region damage pattern. The variations in loading amplitude have a considerable impact on the soil displacement vector field and displacement nephogram effect range in the passive area to the right of the pile. Hysteresis is clearly visible in the load displacement curve at the top of the pile, meanwhile, as loading times increase and cause cumulative displacement, the hysteresis circle shifts to the right. Accompanied by the reduction of the hysteresis loops area and the increase of the secant stiffness, the soil varies from plastic deformation to elastic deformation as the dominant change. After cyclic loading, there is a sizable pinch in the hysteresis loop, which weakens the energy dissipation capacity. In comparison to before loading, the pile foundation’s horizontal bearing capacity and elastic deformation capacity have greatly increase.

导出引用

姜彤, 何天乐, 王璇, 王静. 波浪荷载下海上风力机桩基础滞回效应及水平承载力变化特性研究[J]. 太阳能学报. 2024, 45(8): 546-553 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0579

Jiang Tong, He Tianle, Wang Xuan, Wang Jing. STUDY ON HYSTERETIC EFFECT AND HORIZONTAL BEARING CAPACITY OF PILE FOUNDATION FOR OFFSHORE WIND TURBINE UNDER WAVE LOAD[J]. Acta Energiae Solaris Sinica. 2024, 45(8): 546-553 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0579

中图分类号： TU475

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