Question

What is a ‘raft foundation’? When is it preferred?

Answer 1

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Type of foundation used for heavy loading, or construction on soft ground, composed of a continuous slab of reinforced concrete below the entire surface. In Venice, many of the mediaeval raft foundations underneath the large churches are made of wood.
Flat Slab Type Raft Foundation: When column situated at equal distance and column loads are equally distributed on the foundation, in such cases raft may be designed as having the uniform slab thickness. ...

Slab-Beam Type Raft Foundation: ...

Cellular Type Raft Foundation:


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