Load-bearing Characteristics of Pile-bucket Composite Foundation under V-H Loading in Sand Over Clay Soil Deposit
Offshore wind turbine foundations are subjected to not only vertical forces(V),such as dead weight,but also horizontal loads(H)under the influence of currents,waves,and wind.In order to ex-plore the load-bearing behavior under V-H combined loading of a new type of offshore wind turbine composite foundation,which was composed of a single pile and suction bucket in sand over clay soil deposits,a series of indoor V-H combined loading model tests for the pile-bucket composite founda-tion were independently designed and completed.Load-displacement curves and bending moment dis-tribution curves for the pile-bucket composite foundation under different combined parameters were ob-tained,and V-H bearing capacity envelopes were drawn.Based on this,ABAQUS was used to estab-lish a three-dimensional numerical analysis model for pile-bucket composite foundation in sand over clay soil deposits.After model validation and parameter analysis,the effects of sand layer thickness,bucket diameter,bucket height,and loading height on its bearing characteristics were investigated.A simplified formula for calculating the bearing capacity of the pile-bucket composite foundation was de-veloped.The results showed that the pile-bucket composite foundation could significantly improve the horizontal bearing capacity of the pile by about 30%～90%.Moreover,increasing the bucket diameter was more efficient in improving its horizontal bearing capacity than increasing the bucket height.For thicker upper sand layers,an optimal pre-applied vertical load existed that maximized the horizontal bearing capacity of the composite foundation,and it varied in the range of 0.4～0.7 Vult under different loading cases.
国家科技期刊平台
NSTL
万方数据
维普
