A structure is erected on an impervious clay whose thickness is 12 m. Drainage is possible both at upper and lower surfaces. Coefficient of consolidation is 0.015 cm² per minute. For attaining 50% consolidation with a time factor 0.20, the number of days required

A structure is erected on an impervious clay whose thickness is 12 m.

1.	A structure is erected on an impervious clay whose thickness is 12 m. Drainage is possible both at upper and lower surfaces. Coefficient of consolidation is 0.015 cm² per minute. For attaining 50% consolidation with a time factor 0.20, the number of days required
A.	3233
B.	3123
C.	33331
D.	3313
Answer» D. 3313