Suggest relevant type of foundation with sketch for a residential building with Marshy soil at greater depth with justification and explanation.

Suggest relevant type of foundation with sketch for a residential building with Marshy soil at greater depth with justification and explanation.
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Answer :

Raft foundation is suitable for a residential building with Marshy soil at greater depth

It is suitable where ground is soft, Clayey or marshy having low bearing capacity and where sub soil water conditions are uncertain. The raft foundation is also used to reduce settlement below highly compressible soils

It proves to be to be economical under waterlogged area where pile foundation cannot be used advantageously and independent column footing becomes impracticable. Raft is acting as a floor consisting of thick reinforced concrete slab covering the entire area of the bottom of the structure.

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