加装稳定翼的海上风电大直径单桩基础数值仿真  

Numerical simulation of a new type of large-diameter monopile with wings for offshore wind turbine structure

作　　者：李炜[1] 郑永明[1] 孙杏建[1] 罗金平[1] 赵生校[1] 

机构地区：[1]中国水电顾问集团华东勘测设计研究院,浙江杭州310014

出　　处：《水利水运工程学报》2012年第3期56-63,共8页Hydro-Science and Engineering

基　　金：中国水电顾问集团华东勘测设计研究院院立项课题:海上风电基础结构关键技术研究(KY2010-02-19);海上风电基础结构动力响应及疲劳寿命分析(KY2011-02-07-02)

摘　　要：针对海上风电机组大直径单桩基础水平位移不易控制等问题,提出了一种加装稳定翼的单桩结构型式.通过在近地表(泥面)一定范围内的桩身设置一组翼板,充分利用浅层桩前土的抗力,增强了基桩水平承载性能.借助数值仿真计算结果,采用指数拟合法、四阶多项式拟合法对水平荷载与基桩水平位移关系进行拟合,进而求解单桩水平极限承载力.结果表明,四阶多项式拟合法精度更高;加装稳定翼的单桩水平位移及桩身最大弯矩明显降低,单桩水平极限承载力显著增强,稳定翼安装位置会对基桩水平承载力的提高效果产生影响.该结构形式可推广到其他海上风电基础结构小直径钢管桩的桩型改良中,有利于减小相应的材料成本及施工成本.The horizontal displacement control of a monopile with a large diameter is the main difficulty for offshore wind turbine.A new type of large-diameter monopile with steel-wings set in the region of the pile near the mudline,named the wing-monopile,is investigated.With the help of wings,the shallow soil reaction in front of the pile is taken full advantage of;and the horizontal bearing capacity of the monopile is enhanced.The relationships between the horizontal load and the horizontal displacement are fitted by adopting an exponential model and a 4-order polynomial model based on data obtained by numerical simulation.The simulated results show that the 4-order polynomial model is more accurate than the exponential model;because of the setting of steel-wings,the horizontal displacement and the maximum moment of a pile are decreased observably;the horizontal bearing capacity of a pile is increased markedly and the increment is influenced by the setting-position of the wings.The method to improve the horizontal bearing capacity of steel-pile by the wings can be used for other types of a small-diameter pile of foundation structure of the offshore wind turbine so as to decrease the construction cost.

关 键 词：海上风电 单桩 稳定翼 水平承载力 

分 类 号：TU473.1[建筑科学—结构工程]