Numerical Study Of The Failure Mode And Pullout Capacity Of Anchor Piles In Clay

With higher demand in urban construction,marine traffic and energy exploitation,piles,which used to be bearing foundations,are acting as anchors to provide pullout capacity for other buildings.Rational prediction and calculation of the pullout capacity of anchor piles,which directly determined by the failure mode,is the guarantee of the safety and stability of engineering structures.Study on the failure mode and the pullout capacity of anchor piles under inclined load is of great significance,which may contribute to the development of theoretical study and pile design.A large deformation finite element analysis using a coupled Eulerian-Lagrangian approach is performed to study the pullout capacity and the failure mode of anchor piles in clay.Before the numerical analysis,key issues are properly dealt with,including soil constitutive model,contact friction,loading method and determination of failure load.By comparing with the published experiment result,the validity of the FE model is well verified.A parametric analysis is carried out to study the effects of soil property,frictional behavior,load angle and pile length-diameter ratio on the pullout capacity of anchor piles.Using both analytical and numerical method,a comparative study is performed to study the optimal loading point as well as the failure mode and the pullout capacity of piles with inclined load applied at the optimal location.The validation of the theoretical method is verified by the numerical result.Relationships are established between the optimal loading point and the loading or failure angle,the pullout capacity and the failure mode,and the pullout capacity of the loading point.