The maximum
permissible settlement depends upon the type of the soil, the type of the
foundation and structural framing system.
As per IS 1904-1986,
for RC structures;
|
Type of foundation |
Maximum Permissible settlement for
Sandy soil |
Maximum permissible settlement for Clayey soil |
|
Isolated Foundation |
50 mm |
75 mm |
|
Raft Foundation |
75 mm |
100 mm |
The progressive
settlement on clays permits better strain adjustments in the structural members.
And for a unit increase in a total settlement of clay, there is less increase in differential
settlement compared to sand. That is why the maximum permissible settlement is more
for clayey soil compared to sandy soil.
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