PLEASE HELP A&B$,$D$!!$ C ANSWER$=1,611\mathrm{.}78$mm$!!$

As part of a construction project, a $16$ meter$-$thick layer of clay is to be loaded with a temporary $5-$meter thick sand layer $($see figure below$).$ The figure shows the water$-$table location, soil unit weights, and the compression$-$curve properties for the clay. Assume that the sand layer remains dry. The clay has an initial OCR of $1\mathrm{.}5($which is constant throughout layer$).$

a$.$ Calculate the ultimate settlement that will occur under these conditions $($at the surface of the sand$)($in units of $mm).$

b$.$ How much will the clay layer heave when the $5-$meter sand layer loading is removed $($in units of $mm?$

c$.$ If instead a $10-$meter thick sand layer was applied, what would the resulting ultimate settlement be under these conditions $($at the surface of the sand$)($in units of $mm)?$ ANSWER$=1,611\mathrm{.}78$mm

d$.$ Is your answer from part $c$ twice your result from part a$?$ Does this make sense? Why or why not?