Soil Mechanics and Foundation Engineering - Engineering

Q1:

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

ANS:C - 33331

Time factor T=(c*t)/d^2.

T=0.2
D=1200
d = 1200/2
= 600.

Time reqd for consolidation t=(0.2*600^2)/0.015=4800000/(25*60)=3333.