摘要
单桩是目前海上风电最常用的基础形式,其长期累积变形一直是设计中的关键问题。行业内常采用的API规范中循环p-y曲线无法考虑循环次数以及荷载幅值对累积变形的影响。同时,现有研究大多采用单向或双向加载,无法真实地模拟波浪荷载和风荷载。基于相似理论,以中国南海某风电场10.5 MW风机为原型,以真实海洋工况的风浪荷载组合为设计依据,在粉质黏土中开展了多组循环加载模型试验。试验结果表明:双向加载比单向加载产生的累积倾角更大,且累积倾角增长速率与循环荷载幅值和对称性参数无关;荷载幅值越大桩基础泥面处的累积倾角越大,部分荷载工况会导致单桩发生承载能力极限状态(ULS)破坏;当循环次数一定时,单桩泥面处的累积倾角与循环荷载幅值呈二次函数增长,与荷载的对称性参数呈线性递减。提出了适用于粉质黏土中单桩在不同循环荷载作用下的累积倾角预测方法。
Monopile foundations are the most commonly used type for offshore wind power,and their long-term cumulative deformation remains a key issue in design.The industry-standard API cyclic p-y curves fail to account for the effects of cycle number and load amplitude on cumulative deformation.Moreover,most existing studies employ unidirectional or bidirectional loading,which cannot realistically represent combined wind and wave actions.Therefore,based on similarity theory,this study conducts a series of model tests under multi-directional cyclic loading in silty clay,using a 10.5 MW wind turbine from a South China Sea wind farm as the prototype and actual wind-wave load combinations as the design basis.Test results indicate that cumulative inclination under multidirectional loading exceeds that under unidirectional loading,and its growth rate is independent of cyclic load amplitude and symmetry parameters.Larger load magnitudes lead to greater cumulative inclination at the mudline,and partial loading may result in failure of the monopile under ultimate limit state(ULS)conditions.With a fixed number of cycles,cumulative inclination at the mudline increases quadratically with load magnitude and decreases linearly with load symmetry.A predictive method for cumulative inclination in monopiles under varying cyclic loads in silty clay is proposed.
作者
闫航航
刘润
梁超
梁锐
YAN Hanghang;LIU Run;LIANG Chao;LIANG Rui(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300350,China;Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China)
出处
《海洋工程》
北大核心
2025年第6期81-90,共10页
The Ocean Engineering
基金
渤海湾海洋风电与光伏联合高效开发利用研究项目(U21A20164)
国家自然科学基金杰出青年科学基金项目(51825904)。
关键词
单桩基础
10.5
MW风机
循环荷载
累积倾角
海上风电
monopile foundation
10.5 MW turbine
cyclic loading
cumulative inclination
offshore wind power
