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Doctors Medicines MCQs Q&A

  1. Isolated footings on clays
  2. Isolated footings on sands
  3. Rafts on clays
  4. Rafts on sands
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1 Answers

Option 3 : Rafts on clays

Explanation:

IS code specification for permissible settlement:

(1) Total Permissible settlement:

  • For isolated footing on clay = 65 mm
  • For isolated footing on sand = 40 mm
  • For raft foundation on clay = 65-100 mm
  • For raft foundation on sand = 40-65 mm

(2) Permissible Differential settlement:

  • For isolated fotting on clay = 40 mm
  • For isolated footing on sand = 25 mm

From above data, it is observed that, total permissible settlement is higher for raft foundation on clay.

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