Problem $2$

A contractor plans to dig an excavation as shown in the figure below. The river is at level A right

now.

$($a$)$ To what elevation can the water rise before a quick condition will develop?

$($b$)$ Please also calculate the factor of safety $($FS$)$ against quick conditions for Problem $2$a$.$

Elevation at which a quick condition develops$)\frac{?}{?}($Elevation $A.$

$($c$)$ To what elevation can you continue to dig the excavation before a quick condition will

develop.

Note: you may neglect shear along sides. $($Part C is most important for me$)$