Fintie Element Analysis And Exprimental Validation Of Bucket Foundation During Pull-out Test

Bucket foundation is a common form foundation for ocean engineering,and bucket foundation has the advantages of easy installation,economic feasibility and recoverability.The basic precondition of bucket foundation platform application is that it can be penetrated into the target during setup,can stand stably during work and can be pulled out during removal.But,the soil-skirt Interaction and resistance reduction effect during pull-out is not very clear.So study the Pull-Out Test of bucket foundation is significant.Pull-Out Test on the bucket foundations were taken in silty clay by this paper.Research content including the soil squeezing effect of walls in Pull-Out Test,the calculation method of lateral and tip resistance.The main content and conclusion in this thesis are listed as follow.(1)The numerical simulation of Pull-Out Test on bucket foundations was taken,and the pressures of walls were gotten.For soil squeezing effect,effect of tip's angle,dilation angle and frictional angle were studied.(2)Pull-Out Test on the bucket foundations were taken.The tip resistance is directly related to the strength of the soil.According to the standard,based on the undrained shear strength and the CPT,the lateral and tip resistance can be calculated accurately.(3)Due to the difference of soil squeezing effect,? and kf will take larger value when the inner resistance is calculated.Under extreme vertical loads,we can determine the failure mode for the whole foundation of shear failure with reference to the soil cracking form and P-S curve.For each part of the bearing capacity of the bucket foundation,the difference between theoretical value and experimental value do not exceed 10%.