Experimental Study of a Square Foundation with Connected and NonConnected Piled Raft Foundation Under Eccentrically Loaded

In the recent years, nonconnected piled raft foundation has been considered as an economical and practical deep foundation in the situation that high shear and concentrated loads may occur at the connection of the raft and pile head. This paper was presented an experimental study of a square foundation on the effects of parameters such as S/D, L/D and etc. in two cases of connected or nonconnected piled raft system under the eccentrically loaded raft. The results was showed that square raft in the case of S/D = 3 and L/D = 8, the bearing capacity of the nonconnected piles is more than that of the connected piles. The results of the experiments was showed pile length is more effective than the pile spacing in connected pile raft system. However by decreasing pile spacing, bearing capacity is increased in nonconnected pile raft and pile spacing is more effective than the pile spacing in nonconnected pile raft system. Comparison of bearing capacity and settlement indicated in the nonconnected piled raft system, the longer piles not only has not much effect in increasing bearing capacity significantly, but also has lower effect on the reduction of the settlement. Also in nonconnected piled raft system by increasing the pile spacing reduced BPI (bearing pile index) wile in connected piled raft system increased.