Question $9$:

$($Value: $24$ marks$)$

In Table $1$ given below, the standard penetration test $($SPT$)$ results determined in the field for a sandy soil deposit are summarized. The ground water table was found to be located at a depth of $18m.$ Estimate the angle of internal friction, $\text{'}$ from the provided data using an appropriate technique $($give the source where this information is obtained$)$ and design a shallow foundation measuring $3\mathrm{.}03\mathrm{.}0m$ in plan and seated at a depth of $2\mathrm{.}5m.$ Note: The design calculations should be based on the $\text{'}$ value obtained, not on methods based on direct correlations of Bearing Capacity to Penetration Index

Table $1$

$\backslash$table$[[$Depth $[$m$],$Soil Unit Weight $k\frac{N}{m^3},N_{60}$