Question $3$

$($a$)$ What is meant by the term $$undrained$$ as in undrained shear strength or undrained stability analysis. $(10\%)$

$($b$)$ Field vane testing is undertaken at the site shown on Figure $5.$ The vane was $50$ mm in diameter and $100$ mm high. The torque measured when the soil was failed was equal to $24$ Nm for the upper clay layer and $50$ Nm for the lower clay layer. Determine the undrained shear strength of these two layers. $(30\%)$

$($c$)$ For the Site shown on Figure $5,$ illustrate with the use of some sketches how you would determine the factor of safety against slope failure. You do not need to do the calculation but only illustrate the approach you would take. $(45\%)$

$($d$)$ Illustrate using a sketch how you would determine the permeability of the upper clay layer shown on Figure $5.$ You do not need to derive the formula to be used with this test. Question $3$

$($a$)$ What is meant by the term "undrained" as in undrained shear strength or undrained stability analysis.

$(10\backslash \%)$

$($b$)$ Field vane testing is undertaken at the site shown on Figure $5.$ The vane was $50$ mm in diameter and $100$ mm high. The torque measured when the soil was failed was equal to $24$ Nm for the upper clay layer and $50$ Nm for the lower clay layer. Determine the undrained shear strength of these two layers.

$(30\backslash \%)$

$($c$)$ For the Site shown on Figure $5,$ illustrate with the use of some sketches how you would determine the factor of safety against slope failure. You do not need to do the calculation but only illustrate the approach you would take.

$(45\backslash \%)$

$($d$)$ Illustrate using a sketch how you would determine the permeability of the upper clay layer shown on Figure $5.$ You do not need to derive the formula to be used with this test.

Bedrock