Question

A 3 m thick clay layer is subjected to an initial uniform pore pressure of 145 kPa as shown in the figure.



For the given ground conditions the time (in days, rounded to the nearest integer) required for 90% consolidation would be

• A. 1771

Answer 1

The correct option is A 1771
It is one way drainage case so

H = 3 m = 3000 mm

$T_v=\frac{c_{v}t}{H^2}$

$t=\frac{0.85\times {3000}^2}{3}$

= 2550000 minutes

= 1770.83 days

= 1771 days