Question

For a certain loading condition, a saturated clay layer undergoes 40% consolidation in a period of 178 days. What would be the additional time required for further 20% consolidation to occur?

• A. 89 days
• B. 222.5 days
• C. 329.5 days
• D. 400.5 days

Answer 1

The correct option is B 222.5 days

$\text{Time factor,}{T}_v=\frac{\pi }{4}{U}^{2}forU<60$

$\text{For same clay layer at different times,}{t}_{1}and{t}_2\text{the relationship reduces to}$

$\frac{t_2}{t_1}={\left(\frac{U_2}{U_1}\right)}^2$


$\Rightarrow t_2={\left(\frac{60}{40}\right)}^2\times 178$

= 400.5 days

$\text{Thus additional time needed}=t_2-t_1$

= 400.5 - 178
= 222.5 days