海上风电大直径楔形单桩高频振动沉桩特性OA北大核心CSTPCD

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.