摘要
海上风电工程主要受到风、波浪及洋流等产生的水平循环荷载作用,本文研究楔形单桩基础在水平循环荷载作用下的变形规律,并探讨不同循环荷载对变形规律产生的影响,以确保风电设施正常运行。通过数值模拟建立海上风电单桩-海床模型,考虑土体超孔隙水压力的演变规律及土体致密规律,土体采用UBC3D-PLM本构模型。本文重点讨论并分析在不同水平循环荷载作用下楔形单桩基础与等截面单桩基础的桩周土体位移、塑性应变及桩基累计转角位移之间的差异。研究结果表明:楔形结构会降低桩周土体位移及塑性应变,使得楔形单桩基础旋转中心位置更低,产生倾覆的可能更小,当循环荷载比为0.7时,累计转角位移能减少41.86%;循环荷载越大,楔形单桩基础水平受荷特性越好,累计位移减少量的增长率越高。研究成果可为今后海上风电基础的选择与设计提供参考。
Offshore wind power projects mainly bear the horizontal cyclic load generated by wind,wave and ocean current.The deformation law of single wedge pile foundation under horizontal cyclic load was studied.The influence of different cyclic loads on the deformation law was discussed to ensure the normal operation of wind power facilities.A single pile seabed model of offshore wind power was established through numerical simulation.Considering the evolution law of excess pore water pressure and the law of soil compaction,UBC3D-PLM constitutive model was adopted for soil.Under the action of different horizontal cyclic loads,the paper focused on discussing and analyzing the differences between the displacement of soil around the pile,plastic strain and the cumulative rotation displacement of the pile between the wedge-shaped single pile foundation and the uniform section single pile foundation.The research shows that the wedge structure can reduce the displacement and plastic strain of the soil around the pile.Wedge structure makes the rotating center of wedge single pile foundation lower and the possibility of overturning is smaller.When the cyclic load ratio is 0.7,the cumulative angular displacement can be reduced by 41.86%.The greater the cyclic load is,the better the horizontal loading characteristics of the wedge single pile foundation is,and the higher the growth rate of the cumulative displacement reduction is.The research results can provide reference for the selection and design of offshore wind power foundation in the future.
作者
袁兰
张健
陆亚
YUAN Lan;ZHANG Jian;LU Ya(Architectural Engineering Institute,Chongqing Institute of Engineering,Chongqing 401320,China)
出处
《海洋技术学报》
2023年第1期78-87,共10页
Journal of Ocean Technology
基金
国家自然科学基金资助项目(41272299)。
关键词
波浪荷载
楔形单桩基础
海上风电
累计转角
土体变形
wave loading
wedge single pile foundation
offshore wind power
accumulated rotation
soil deformation range
