Load Transfer Mechanism of Setp Cross-Section Pipe Pile

In order to study the bearing capacity of unimate cross-section pipe pile and setp cross-section pipe pile, a finite difference model of the pile-soil interaction is established by FLAC3D,. The bearing behaviors of the setp cross-section pipe pile and the traditional unimate cross-section pipe pile are studied comparatively, the bearing performance influence factors of setp cross-section pipe pile is discussed. The results show that setp cross-section pipe pile can decreased the settlement relative to unimate cross-section pipe pile.There is an optimum diameter ratio in theory. For a reasonable pipe diameter ratio to setp cross-section pipe pile, on the one hand, it can effectively improve the stress behaviors of pile and reduces the pile settlement.On the other hand, it also can reduce the dosage of pile material and has good economic benefits.Under the action of the determinate pile load, the increase in length can reduce the settlement,but there is an optimal pile length, by increasing pile length to reduce the settlement of piles has little effect when the pile length exceeds the optimal length of pile.