Problem Statement

A $8m$ high embankment is planned to level up a depressed ground for highway construction. The soll profile consists of $3m$ of silty sand, underlain by $6m$ of clay, and followed by dense sand. An undisturbed sample was retrieved from the middle of the clay layer for the oedometer test Calculate $($a$)$ the expected settlement and $($b$)$ the time needed for $90\%$ of consolidation.

$\backslash$table$[[,8m$ of embankment fill: $=22k\frac{N}{m^3}$