Characteristic analysis of long-short-pile composite foundation

A practical engineering of the long-short-pile composite foundation is presented.By means of finite element analytical method, the stress distribution and displacement of four foundations reinforced by long-short-pile composite foundation, whole long piles, whole short piles and raft foundation under the same geological conditions have been compared and analyzed.The research results show that under the same loading condition, the characteristics of foundation reinforced by whole short piles are approximate to those of natural foundation while the characteristics of foundation reinforced by long-short-pile composite foundation are similar with those of foundation reinforced by whole long piles.Compared with foundation reinforced by whole short piles and raft foundation, the long-short-pile composite foundation can reduce the whole settlement and the settlement difference of foundation effectively, and it makes foundation more reasonable.Furthermore, long-short-pile composite foundation can achieve great economical benefit compared with whole long piles, therefore, it will be of immense foreground for engineering practice.