This study presents the findings of small-scale model tests conducted to investigate the horizontal bearing characteristics of tripod-bucket foundations subjected to scouring conditions in sand.The experimental results served as the basis for analyzing the effects of scour rate e and bucket spacing S/D on the horizontal and bending moment bearing capacity through numerical simulations.Additionally,a calculation method for scour correction coefficients dhe and dme of the ultimate bearing capacity was proposed.By employing the fixed load ratio method,the failure envelope of the tripod-bucket foundation under combined horizontal and bending moment M-H loads was determined.The impact of scour rate e and bucket spacing S/D on the failure envelope was thoroughly examined,leading to the development of a formula for the M-H failure envelope of the tripod-bucket foundation under scouring conditions.The results indicate that the failure process of the tripod-bucket foundation under scouring conditions can be categorized into three stages:elastic deformation,plastic deformation,and instability failure.The horizontal ultimate bearing capacity of a three-cylinder foundation decreases with the increasing erosion rate e,and the rate of decrease progressively accelerates,while for three-cylinder foundations with the same length-to-diameter ratio,the horizontal ultimate bearing capacity decreases with a reduction in the relative spacing between the cylinders.With the increase in erosion rate e,the M-H failure envelope of the three-cylinder foundation shifts inward,and as the relative spacing between the cylinders S/D increases,the normalized failure envelope tends to exhibit an upward convex trend.
tripod-bucket foundationscour rateultimate bearing capacitybending moment capacityscour correction coefficientenvelope
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维普
万方数据
