A three-dimensional elastic-plastic model of an uplift-resistant pile with enlarged base was constructed with the general-purpose software ABAQUS.The behavior of uplift resistance of the pile was studied with the finite element model.In order to validate the finite element model

the computational result was compared with that of an in-situ full-scale pile test.The comparison shows that the behavior of uplift resistance of piles with enlarged base can be simulated with the model.Then the distributional characteristics of axial force and frictional force

the developing regularity of deformation and plastic strain in soils surrounding the pile body and base

and the effect of the enlarged base to vertical stress in soils were studied.At the same time

by changing the parameters

the sensitivity was analyzed for different diameters

lengths

expansion angles of the enlarged base

and the characteristics of soils where the enlarged base was embedded;and the analysis shows that the diameter of the enlarged base and the characteristics of surrounding soils have relatively great effect on the uplift-resistant capacity while the effect of the height of the enlarged base is rather little.