Evolution And Calculation Method Of The Bearing Capacity Of Bucket Foundation Considering Scouring

As a basic form mainly used in marine engineering,the bucket foundation has become an important basic form of offshore wind power due to its advantages of simple structure,convenient construction and low project cost.The foundation must not only bear the structural self-weight load during the design life,but also the huge horizontal and bending moment loads caused by wind waves,ocean currents,upper fan group operation,etc.will be transferred to the foundation to bear;in addition,disturbances will occur when the ocean current flows through the bucket foundation.The flow phenomenon forms a horseshoe-shaped vortex around the foundation,causing local erosion of the soil around the foundation,reducing the bearing capacity of the foundation,and bringing potential safety hazards to the overall structural stability.In this compound loading mode,the bearing problem before and after scouring has become a subject worthy of study.The load-bearing bucket foundation with an aspect ratio of 0.25-2 is studied by numerical calculation on the composite load-bearing characteristics of the bucket foundation under erosion conditions,taking into account the unevenness of different erosion depths,foundation soil strength with depth,and the impact of aspect ratio,content and results are as follows:(1)The undrained unidirectional bearing capacity under vertical load V,bending moment load M,and horizontal load H is obtained through numerical calculation.The system analyzes the distribution of different erosion depths,different aspect ratios,and soil strength along the vertical Based on the law and other factors,the evolution of the bearing capacity and the failure mechanism,combined with the finite element calculation results and the failure mechanism,were proposed to calculate the vertical bearing capacity,horizontal bearing capacity and bending moment bearing capacity of the bucket foundation under the scouring condition.(2)Through numerical calculation,the failure envelope of the bucket foundation under combined VH and VM loading conditions is obtained.The evolution of the bearing capacity under factors such as different erosion depths,different aspect ratios,and the vertical distribution of soil strength are systematically analyzed.The law and destruction mechanism,combined with the finite element calculation results and destruction mechanism,proposed the calculation method of the bucket envelope VH and VM destruction envelope under scouring conditions.(3)The failure envelope under combined HM and VHM loading conditions is obtained by numerical calculation.The evolution law and failure mechanism of bearing capacity under different erosion depths,different aspect ratios,and the vertical distribution of soil strength are analyzed Based on the finite element calculation results and the failure mechanism,a calculation method for the HM failure envelope of the bucket foundation under scouring conditions is proposed.