Question $2$

You are using a finite element software $($Plaxis $2$D$)$ to model an upcoming excavation. The underlying soils comprises sand, normally consolidated

$($NC$)$ clay and heavily overconsolidated $($HOC$)$ clay layers. You chose to run a short$-$term effective stress analysis using Mohr Coulomb model with c$\text{'}$

and ${}^{\text{'}}$ inputted for all three soil layers. Which of the following statements are true?

a$.$ The ground settlement will be correct for the sand $($drained$)$ and HOC clay $($undrained$).$

b$.$ The ground settlement will be incorrect for all three soil layers.

c$.$ The soil strength is underestimated for both clay layers.

d$.$ The soil strength is underestimated for the HOC clay.

e$.$ The soil strength is accurate for the sand layer only.

$($b$),($c$)$ and $($e$)$ only

$($a$),($d$)$ and $($e$)$ only

$($b$),($d$)$ and $($e$)$ only

$($a$)$ and $($d$)$ only