Question

A 1 m thick layer of saturated clay, drained at both faces, settles by 10 cm in one year. If a thin layer of pervious soil is introduced in the middle of this layer, then what will be the period during which the settlement of 10 cm will be completed?

• A. 4 years
• B. 0.5 years
• C. 0.25 years
• D. 2 years

Answer 1

The correct option is C 0.25 years

For a particular soil

$t\propto d^2$

$\Rightarrow \frac{t_1}{t_2}={\left(\frac{d_1}{d_2}\right)}^2$

$\Rightarrow \frac{1}{t_2}={\left(\frac{1}{0.5}\right)}^2$

$\Rightarrow t_2=0.25years$