QUESTION TWO $[20$ Marks$]$

Figure Q$2$ shows a section abutment wall for the bridge site located across the busy Webuye Busia route. The results also show the founding strata to be a cohesionless soil having an angle of shearing resistance $(\backslash (\backslash$varnothing $\backslash ))\backslash (=30^\{\backslash$circ$\}\backslash )$ and a safe bearing capacity of $\backslash (1000\backslash$mathrm$\{$kN$\}/\backslash$mathrm$\{$m$\}^\{2\}\backslash ).$ The backfill material is class $6$ N with an effective angle of internal friction $(\backslash (\backslash$varnothing $\backslash ))\backslash (30^\{\backslash$circ$\}\backslash )$ and a density of $\backslash (18\backslash$mathrm$\{$kN$\}/\backslash$mathrm$\{$m$\}^\{2\}\backslash ).$ The abutment supports dead and highway loads of $1800$ kN and $2500$ kN $,$ respectively. If the overall carriageway width is $6\mathrm{.}5$ m wide, check the stability and bearing pressure at the foot of the abutment.

$[20$ marks$]$

Figure Q$2$