B$-$ Problem Based Learning :

$=100$

$h=2$

$1-$ A building is expected to increase the vertical stress at the center of a $2-m-$thick

clay layer by $100$kPa. If $mv$ is $4{10}^{-4}\frac{m^2}{k}N,$ calculate the primary consolidation

settlement.

$2-$ A culvert is to be constructed in a bed of sand $(e=0\mathrm{.}5)$ for drainage purposes. The

roof of the culvert will be located $3m$ below ground surface. Currently, the ground$-$

water level is at ground surface. But, after installation of the culvert, the groundwater

level is expected to drop to $2m$ below ground surface. Calculate the change in

vertical effective stress on the roof of the culvert after installation. You can assume

the sand above the ground$-$ water level is saturated.