Analysis Of Horizontal Bearing Characteristics Of Winged Pile Foundation For Offshore Wind Turbine

At present,the world’s energy shortage problem is prominent,the energy security situation is becoming increasingly serious,the development of renewable energy,energy transformation has become an important energy strategy for all countries at this stage.As one of the most large-scale development of clean energy,vigorously develop the use of offshore wind energy,the development of offshore wind farms,to improve energy supply capacity,in China’s energy structure adjustment has an important role.The increase in the scale of offshore wind farm construction and the complexity of the offshore environmental loading put forward higher requirements for the horizontal bearing capacity of offshore wind turbine foundation,so this paper increases the horizontal bearing capacity of the pile foundation by adding the wing plate on the monopile foundation,and studies the horizontal bearing characteristics of the foundation of the wing pile under different influencing factors,and the main work carried out and conclusions obtained are as follows:(1)The horizontal bearing capacity of winged pile under 11 different working conditions is analyzed by static test,and the effect of winged pile to enhance the horizontal ultimate bearing capacity is better analyzed by the expression of wing plate efficiency,and the effective bearing area is increased by calculating the winged pile,and it is concluded that the wing plate efficiency is best when the effective bearing area is increased by 0.05 times;by calculating the rotation center of the pile,it is found that as the size of the wing plate increases and the loading height increases,the center of rotation moves up.,and the center of rotation of all piles is located at 0.67-0.8 times the depth of pile embedment.(2)In the process of displacement control cyclic loading,the pile foundation squeezes the soil on the pile side to make it dense,and then as the pile foundation is uplifted,the sinkhole appears on the pile side,and finally the two effects cancel each other to reach equilibrium,and the force time curve shows an increase and then decrease,and finally tends to be stable.Compared with monopile,the winged pile can reduce the accumulated deformation of the soil on the pile side during the cyclic process,thus ensuring the stability of the structure.(3)In the process of force-controlled cyclic loading,the average cumulative displacement of the winged pile foundation is smaller than that of the monopile foundation,and the resistance deformation of the pile foundation is improved,thus ensuring the safety of the structure.When changing the cyclic load loading sequence,due to the compactness of the sand foundation under cyclic action,the cumulative displacement of the pile foundation generated by the cyclic loading of the first stage is greater than that of the second cyclic loading.(4)Through the numerical simulation analysis,the wing pile foundation with the increase of the wing plate length wing plate efficiency increase amplitude decreases,the wing plate length before increasing the bearing area 0.05 times play slightly higher advantage than the wing plate width,increase the bearing area at 0.05 times,when the wing plate efficiency is the best,while the wing plate length is 0.5 times the burial depth,wing plate width is 0.5 times the pile diameter is the best wing plate size.Compared with monopile foundation,adding wing pile foundation can effectively reduce pile displacement and pile bending moment.This paper systematically analyzes the horizontal bearing characteristics of winged pile foundation under different influencing factors,which provides data support and theoretical basis for the future construction of winged pile foundation for offshore wind turbine.