Q$.1($a$)$ Consolidated Drained $($CD$)$ triaxial tests were conducted on a soil with failure

conditions summarized in Table Q$.1($a$)$ below:

$($i$)$ Determine the cohesion $($c$\text{'})$ and angle of frictional resistance $({}^{\text{'}})$ of the soil in

terms of "effective stress' by use of Mohr's Circle. Draw the failure envelope on

page $12$ and submit it together with the answer booklet.

$(7$ marks$)$

$($ii$)$ Determine the orientation of the failure plane $()$ with respect to horizontal as

shown in Figure Q$.1($a$)$ and the shear and normal stresses acting on the failure

plane for Test number #$2$ in Table Q$.1($a$).$