不同黏性土循环弱化特征及海上风力机桩基累积位移规律分析

邱子宁; 许成顺; 杨钰荣; 刘开源

doi:10.19912/j.0254-0096.tynxb.2024-0156

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (5) : 619-628. DOI: 10.19912/j.0254-0096.tynxb.2024-0156

不同黏性土循环弱化特征及海上风力机桩基累积位移规律分析

邱子宁¹, 许成顺¹, 杨钰荣¹, 刘开源²

作者信息 +

ANALYSIS OF CYCLIC WEAKENING CHARACTERISTICS OF COHESIVE SOIL AND CUMULATIVE DISPLACEMENT OF SINGLE PILE FOUNDATION OF OFFSHORE WIND TURBINES

Qiu Zining¹, Xu Chengshun¹, Yang Yurong¹, Liu Kaiyuan²

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文章历史 +

摘要

通过开展室内饱和黏土竖向-扭转双向耦合剪切试验,提出考虑主应力轴连续旋转的黏土刚度软化模型并嵌入Flac^3D三维桩-土相互作用数值模型,分析粉土、粉质黏土和黏土这3类场地中海上风电大直径桩基的循环累积变形规律。结果表明,3类场地的泥面位移累积率均随循环次数的增加先增加后趋于稳定;桩基侧向累积位移与场地土体的塑性指数密切相关,塑性指数越大,割线模量衰减越慢,桩身累积位移发展越慢。

Abstract

Offshore wind turbines are subjected to cyclic loads such as wind and waves over long periods during operation. The soil surrouding the piles is prone to stiffness degredation under the cyclic loads, leading to an increase in the cumulative displacement of the pile foundation, which endangers the normal operation of the wind turbine system. By carrying out indoor vertical-torsional two-way coupled shear tests on saturated clay, a clay stiffness softening model considering the continuous rotation of the principal stress axis was proposed and embedded into the Flac3D three-dimensional pile-soil interaction numerical model to analyze three types of silts：silty clay and clay. Cyclic cumulative deformation law of large-diameter pile foundations for offshore wind turbines in the Mediterranean Sea. The research results show that the mud surface displacement accumulation rate of the three types of sites first increases and then stablizes as the number of cycles increases; the lateral cumulative displacement of the pile foundation is closely related to the plasticity index of the site soil. The greater the plasticity index, the secant line The modulus decays slowly, and the cumulative displacement of the pile body develops slowly.

导出引用

邱子宁, 许成顺, 杨钰荣, 刘开源. 不同黏性土循环弱化特征及海上风力机桩基累积位移规律分析[J]. 太阳能学报. 2025, 46(5): 619-628 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0156

Qiu Zining, Xu Chengshun, Yang Yurong, Liu Kaiyuan. ANALYSIS OF CYCLIC WEAKENING CHARACTERISTICS OF COHESIVE SOIL AND CUMULATIVE DISPLACEMENT OF SINGLE PILE FOUNDATION OF OFFSHORE WIND TURBINES[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 619-628 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0156

中图分类号： TU47

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