According to IS code, the permissible values of settlement in clay and sand are respectively

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BPSC AE Paper 5 (Civil) 14 Oct 2022 Official Paper
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  1. 65 mm and 40 mm
  2. 40 mm and 20 mm
  3. 30 mm and 60 mm
  4. 60 mm and 30 mm

Answer (Detailed Solution Below)

Option 1 : 65 mm and 40 mm
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Concept:

The allowable settlement is defined as the acceptable amount of settlement of the structure and it usually includes a factor of safety.

The allowable settlement depends on many factors, including the following:

Type of Construction

Use of the Structure

Presence of Sensitive Finishes

The maximum permissible settlement as per IS-1904(1966) for isolated foundations are 40 mm on sandy soil and 65 mm in clayey soils.

The permissible settlement for the raft foundation on clay soil is 65-100 mm and for sandy soil, it is 65 mm.

Differential settlement:

Foundation on clay soil = 40 mm.

The foundation on Sandy soil = 25 mm.
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