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Raft foundation is mainly used when the bearing capacty of the soil is low , in such a case a solid reinforced concrete rigid slab is constructed under the entire building . Structurally , raft foundations develop the maximum availablr bearing bearing area under the building . Another advantage is their continuity and rigidity which helps in reducing differential settlement of individual columns .
Raft Foundation are constructed where the bearing capacity of the soil is low and the structure to be constructed is heavy (multistoreyed).
first, raft foundition can consist of a slab of a uniform thickness or a slab stiffened by a beams either above or below.
this type is useful where the columns load are heavy or the bearing capacity is low resulting in the need of large bases.
also , it is used where the soil mass contains compressible layers or variable so that diffrentail settlemnet would be difficult to control.
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