What is raft foundation when is preferred?

a) Raft foundations are preferred in areas with poor soil bearing capacity, uneven settlement, and the presence of mixed soil types. These foundations achieves the load-bearing capacity through the distribution of stresses to a larger area.

Under what circumstances raft foundation is adopted?

Under what circumstances raft foundation is adopted? Raft foundation is used where settlement above highly compressible soils, by making the weight of the structure and raft approximately equal to the weight of the soil excavated.

What does raft mean in English?

noun. a more or less rigid floating platform made of buoyant material or materials: an inflatable rubber raft. a collection of logs, planks, casks, etc., fastened together for floating on water.

How do you build a raft foundation?

The maximum settlement should generally be limited to the following values: Raft foundation on clay – 65 to 100 mm. Raft foundation on sand – 40 to 65 mm.

2) Soil line Method (Elastic Method) of Raft Foundation Design.

Soil Characteristics Ks(Kg/cm2)
1. Stiff 1 to <2 2.7
1. Very Stiff 2 to <4 5.4
3. Hard 4 and over 10.8

Is raft foundation shallow or deep?

Raft foundations are a type of shallow foundation. They are typically formed by reinforced concrete slabs that cover a wide area, often the entire footprint of a building.

Under what situations raft foundation is preferred?

a) Raft foundations are preferred in areas with poor soil bearing capacity, uneven settlement, and the presence of mixed soil types. These foundations achieves the load-bearing capacity through the distribution of stresses to a larger area.

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How deep are slab foundations?

A slab foundation is made of concrete that is typically 4″–6″ thick in the center. The concrete slab is often placed on a layer of sand for drainage or to act as a cushion.

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