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Question
The permissible settlement is the maximum in the case of
fuEufyf[kr ds ekeys esa Lohdk;Z fuiVku vf/kdre gS
A.
Isolated footing on sand
B.
Isolated footing on clay
C.
Raft on clay
D.
Raft on sand
Answer ( Option C)

Raft on clay

Solution

IS code specification for permissible settlement:
(i) Total Permissible settlement:
For isolated footing on clay = 65 mm
For isolated footing on sand = 40 mm
For raft footing on clay = 65-100 mm
For raft footing on sand = 40-65 mm
(ii) Permissible Differential settlement:
For isolated footing on clay = 40 mm
For isolated footing on sand = 25 mm
(iii) Permissible angular settlement:
For high framed structure < 1/500
To prevent all type of minor damage < 1/1000

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