Time factor for a clay layer is
A. a dimensional parameter
B. directly proportional to permeability of soil
C. inversely proportional to drainage path
D. independent of thickness of clay layer
Answer: Option B
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A. 3 months
B. 6 months
C. 12 months
D. 24 months
A. directly proportional to time and inversely proportional to drainage path
B. directly proportional to time and inversely proportional to square of drainage path
C. directly proportional to drainage path and inversely proportional to time
D. directly proportional to square of drainage path and inversely proportional to time
Tv=Cv.t/d^2 as Cv=k/mv.γ and Tv= k.t/mv.γ.d^2
so option B is correct.
option a is also correct because this dimension less parameter also???
B is correct
K=Cv.mv.¥w
and Tv directly proportional to Cv
So Tv proportional to K
Option c would be correct if it is inversely proportional to square of drainage path
As per formula option c should be corrected.
Time factor is inversely proportional to permeability.
For clay where U is greater than 60% then Tv is directly proportional to pore water pressure
And inversely proportional to sqrt of drainage path.
But how please explain.
I think the formula for time factor is Tv =Cv x t/d2
Therefore it is inversely proportional to d2 drainage path so ans C is correct option