Answer:
456.2 days
Explanation:
Cv = tv x d²/t
For v>69%
We have tv = -0.933log(1-0.65)-0.0851
= 0.4254-0.0851
= 0.340
d² = (19/2)²
= 90.25
Cv = 0.340x90.25/10
= 3.0685mm²/min
At 40% consolidation
Tv = pi/4 x 0.4²
= 0.126
t = Tv x d²/cv
= 0.126x(4000)²/3.0685
t = 656998/60*24
= 456.2days
So it is going to take 456.2 days for a 4-m thick clay layer in the field to undergo 40% consolidation under the same pressure increment.
