You are to consider the potential circular slip surface, being the arc subtended by the angle

and centred at point C marked in Fig$\mathrm{.}2\mathrm{.}1.$ Perform a slope stability analysis using the Swedish $($or

Fellenius$)$ method to determine the factor of safety $($FS$)$ for the slope $($for the considered failure

mode$).$ You are required to consider a minimum of $6$ slices. Note that when calculating your FS$,$

you are to use an accurate approximation of the area of each slice based on its geometry. You are

required to provide at least the following:

$1.$ A diagram drawn to scale that at a minimum illustrates your failure surface, the slices used

in the analysis, and any dimensions you feel relevant to your analysis$/$working out.

$2.$ A table summarising the stability analysis performed for each slice $($to be included in the

summary of results$).$ It is recommended you use Excel to perform your analysis. In your ap$-$

pendix, please include an explanation of your calculation process$/$equations used to obtain

the results in each column $-$ this should include an example calculation for $1$ of the slices.

$3.$ Your calculated factor of safety and the equation used to determine it$.$

$4.$ Compare your FS with that contained in the geotechnical report $($p$37,$ F S $=2\mathrm{.}477).$ Give $2$

reasons why your FS might differ from that in the report $($max $30$ words$).$