$7\mathrm{.}7$ Soive Problem $7\mathrm{.}5$ using Skempton and Bjerrum's method with $s_{tt}=3500l\frac{b}{f}{t}^2$ and OCR$=3.$

$7\mathrm{.}5$ A proposed office building will include an $8-$ft $6-$in square. $3-ft$ deep spread footing that will

support a vertical downward load of $160k.$ The soil below this footing is an overconsolidated

clay $($OC case I$)$ with the following engineering properties: $\frac{C_1}{1+e_{10}}=0\mathrm{.}10,\frac{C_r}{1+e_0}=$

$0\mathrm{.}022.$ and $y=113l\frac{b}{f}{t}^3.$ This soil strata extends to a great depth and the groundwater table is

at a depth of $50ft$ below the ground surface. Using the classical method with hand computa$-$

tions, determine the total settiement of this footing.