A soil has a low allowable bearing capacity. The soil deposit contains compressible loess. A foundation is to be provided for a structure carrying a heavy load. Which one of the following foundation types is to be adpoted ?

Strap footing

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Continuous footing

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Raft foundation

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Combined spread foundation

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Solution

The correct option is C Raft foundation
Raft or mat foundation is a combined footing which covers the entire area beneath of a structure and supports all the walls and columns. This type of foundation is most appropriate and suitable when the allowable soil pressure is low, or the loading is heavy.
Also. when the soil contains lenses of compressible strata which are likely to cause considerable differential settlement, a raft foundation is well suited.

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Q. Match List-I (Suitable condition) with List-II (Foundations) and select the correct answer using the codes given below the lists:

List-I

A. When structural load is uniform and soil is soft clay, made up of marshy land.

B. When structural load is heavy and/or soil having low bearing capacity of considerable depth.

C. When soil is having good bearing capacity at shallow depth and structural load in within permissible limit.

D. When structural load of bridge is to be transferred through sandy soil to bed rock.

List-II
1. Footings
2.Piles
3. Rafts
4. Wells or piers

Codes :

A B C D

Q. Consider the following statements:

1. The bearing capacity of soil-foundation system on a purely cohesive soil is independent of foundation dimension.

2. The contact pressure distribution under a rigid footing on a cohesive soil is uniform.

Which of the above statement(s) is/are incorrect ?

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