A

In the figure shown below $H1=9m,H2=9m,H3=5m,H4=7m,$ and $=807K\frac{N}{m^3}.$ For sand layer $1$ the void ratio is $1\mathrm{.}2$ and specific gravity is $2\mathrm{.}77,$ while the sand layer $2$ has a void ratio of $0\mathrm{.}77$ and specific gravity of $2\mathrm{.}72$ respectively. If for the clay layer $e=1\mathrm{.}34,G=2\mathrm{.}75,LL=43.$ Estimate the primary consolidation settlement if the pre$-$consolidation pressure is $890K\frac{N}{m^3}.$ Assume $Cs=\frac{1}{5}Cc.$ Hint: $Cc=0\mathrm{.}009(LL-10).$

B

What are the pros and cons of soil improvement either by compaction and consolidation?