Question

Directions: The following items consists of two statements; one labelled as 'Assertion (A)' and the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:

Assertion (A): Raft foundations are the best type of shallow foundations to support heavy structures.

Reason (R): Raft foundations has the ability to redistribute load coming on weak pockets of soil below raft to the adjacent soils where the stresses are less severe for the soil at that place. This reduces the chances of differential settlements and increases the bearing capacity.

Codes:

• A. both A and R are true and R is the correct explanation of A
• B. both A and R are true but R is not a correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is A both A and R are true and R is the correct explanation of A

A raft or mat foundation is a thick reinforced concrete slab which supports all the load bearing walls and column loads of a structure or a large portion of structure. A mat is required where load is heavy and the soil is very weak or highly compressible.