海上风电大直径楔形单桩高频振动沉桩特性  

Characteristics of high ferquencyvibration piling of super-largediameterwedged monopiles for offshore wind power

作　　者：袁兰 陆亚 Yuan Lan;Lu Ya(School of Civil Engineering and Architecture,Chongqing Institute of Engineering,Chongqing 400056,China)

机构地区：[1]重庆工程学院建筑工程学院,重庆400056

出　　处：《可再生能源》2024年第9期1189-1197,共9页Renewable Energy Resources

基　　金：重庆市教委科学技术研究项目(KJQN202401916,KJZD-K202301902);重庆工程学院科研基金资助项目(2023xzky03,2023gcky01)。

摘　　要：为研究海上风电中大直径楔形单桩基础在安装方面的经济性,文章采用ABAQUS中的耦合欧拉-拉格朗日方法(CEL)建立高频振动荷载下单桩基础的有限元模型,对比分析同等用钢量的楔形单桩和等截面单桩的沉桩特性。通过分析桩体贯入速度、摩阻力、土体位移和土体应力,探讨楔形结构对基础安装的影响。分析结果显示:楔形单桩在砂土中所需总沉桩时间比等截面单桩减少了38%,在施工方面具有较好的经济效益;但在沉桩后期,楔形单桩的浅层土体位移峰值位置后移,峰值增量有所增加,传递到地基中的能量更多,对土体的扰动更为强烈,地表径向扰动范围增大了0.01r(r为等截面单桩半径)。研究成果不仅为海上风电单桩基础截面型式的设计提供依据,更为探索大直径楔形单桩基础在海上风电项目中的潜在价值提供了重要参考。In order to investigate the economy of installing large-diameter wedge-shaped monopiles to support offshore wind turbines in shallow coastal waters.The Coupled Eulerian-Lagrangian(CEL)approach is used to establish the finite element model of monopiles under high-frequency vibration load in ABAQUS,and the pile sinking characteristics of wedge-shaped monopile with the same amount of steel and monopile with the same section are compared and analyzed.By analyzing the four aspects of pile penetration speed,frictional resistance,soil displacement,and soil stress,this paper explores the influence of wedge-shaped structures on monopiles installation.The research results show that the total pile sinking time required for wedge-shaped monopiles in sandy soil is reduced by 38%compared to monopiles with equal cross-section,which has good economic benefits in construction;However,in the later stage of pile sinking,the peak displacement position of the shallow soil moves back,and the peak increment increases.The energy transmitted to the foundation is more intense,and the disturbance to the soil is more intense.The radial disturbance range of the surface increases by 0.01r.The research results not only provide a basis for the design of the cross section type of monopiles for offshore wind turbines in the future,but also provide an important reference for exploring the potential value of large diameter wedge-shaped monopile in offshore wind power projects.

关 键 词：高频振动 楔形单桩 海上风电 耦合欧拉-拉格朗日(CEL) 沉桩特性 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程]