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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