ABSTRACT

Short Piled Raft foundation system is introduced and intended to solve foundation problem on peat, neither using removal and replacement method nor soil stabilization. In order to obtain a better performance for reducing settlement, two cases concerning the use of type of pile were investigated, concrete pile and closed end steel pipe as pile respectively. Finite element method to simulate the stability performance was used. Concrete slab of 3 m x 3 m square as a raft was assumed to be built on peat and the material properties of pile and raft were constant. Point load from 10 kN to 100 kN with increment of 10 kN were also considered as a static load, acted at the centre of the concrete slab. The outer diameter of pile was .30 m; the length of pile was 3.00 m and the pile spacing was 1.00 m. The raft thickness was considered to be
constant of 0.15 m. The result showed that the use of closed end steel pipe as pile produced better performance significantly than the use of concrete pile. At the maximum load of 100 kN, the maximum total settlement of the concrete pile used was 62.74 x 10m which was higher than the maximum total settlement of closed end steel pipe used was 45.73 x 10-3-3m.

Keywords: short piled raft, closed end steel pipe, finite element method, settlement.