Effect Of Number Of Pile In Pile-Raft System In Organic Clay

Abstract

In the valley area of Imphal in Manipur, organic clay are often encountered in the substrata of the soil which often creates problem in construction. These soils are characterized by low bearing capacity and high compressibility. A pile-raft foundation can be used to reduce the settlements caused by concentrated building loads. This study is mainly aimed to study the influence of spacing of piles and raft width on the behavior of the pile raft foundation in organic clay. Tests were conducted on rafts of size 100x100mm and 200x200mm of thickness 2mm. The numbers of piles were varied at 1, 4 and 9 and from the test results the ultimate bearing capacity of Piles will be increased and the settlement of Pile is reduced as the diameter of Pile increases. It is obtained that the settlement in the pile group standing alone are fast in settling in the beginning and reduced after some loading, but in case of raft alone slow settlement is observed.