Question $2.$

You are an engineer in record for a $10-$story residential building. As for foundation, you decided to

provide individual footing for each column. But the problem is this site has $20ft$ of clay sandwiched

between rock on the bottom and sand on the top. From this course you know clay would take a long

time to dissipate pore water pressure and achieve settlement due to primary consolidation.

a$)$ How long it will take to get $90\%$ consolidation? $C_v$ for this soil is $0\mathrm{.}3c\frac{m}{m}in$

b$)$ This project requires to get $50\%$ consolidation within one month. From this course you know

once way to increase the consolidation is to provide sand pile. At what spacing you need to

provide sand piles to get $50\%$ consolidation in $1$ month?