Based on mechanism of pile-soil interaction

the elastic differential equation of negative skin friction in homogeneous ground is established. An iterative procedure on the basis of finite differential method to calculate displacement of a pile body is proposed. The computing results indicate that the procedure given in this paper is of good convergence and well coincident with reality. The neutral point appears below the pile body according to its definition

showing the agreement with the previous conclusions. The results also show that PCC pile has a small settlement compared with the solid pile of equal cross section area.