Numerical Simulation Research On Horizontal Bearing Mechanism Of Pile-Bucket Composite Foundation And Fan Modal

With the rapid development of China's economy,energy consumption in production and life is increasing,and traditional natural resource reserves such as coal,oil,and natural gas are declining.Renewable clean energy,such as wind energy,may become one of the mainstream energy directions in the future.China's wind power industry is developing rapidly,and offshore wind power will occupy an important position in the future as a renewable energy source.Offshore wind turbines are subject to various horizontal loads such as wind,waves,and earthquakes.Therefore,issues related to the basic design of offshore wind turbines are particularly important.In this paper,the three-dimensional finite element software ABAQUS is used to study the new pile-bucket composite foundation.This paper mainly does the following:1.Establish a 3D model of pile-bucket composite foundation in ABAQUS software,and simulate its static and dynamic response under horizontal load.The simulation results are used to analyze the bending moment,shear force and pile foundation displacement level of the pile-bucket composite foundation,and the p-y curve method is used to study the horizontal bearing mechanism of the pile-bucket composite foundation,and the p-y curve suitable for the pile-bucket composite foundation is modified.2.To further analyze the dynamic response of the pile-bucket composite foundation,the soil constitutive structure is modified based on the original ABAQUS model,so that it is suitable for the study of the bearing capacity degradation of the pile-bucket composite foundation under dynamic action.And the soil boundary is set as an infinite element boundary,and the influence of finite boundary on the research of dynamic response problems is eliminated.The simulation results are analyzed to obtain the performance difference of the single pile foundation and pile-bucket combination foundation in cyclic load resistance.3.Using the basic types used in the above studies,adding a wind turbine model to form a wind turbine structural system,the soil body still uses infinite element boundaries to perform modal analysis of the wind turbine system.The natural frequency of each order mode is extracted for analysis,and the influence of the pile-bucket combination foundation on the natural frequency of each order of the system is studied to provide a reference for the design of the fan foundation.