Problem $4$

Consider a soil characterized by a saturated volumetric weight $\backslash$gamma $\_($sat$)=20$k$($N$)/($m$^(3))$ and a porosity n$=20\%.$

The groundwater table coincides with the ground surface.

Questions

Determine the effective vertical stress $\backslash$sigma $^(\text{'})$ at a depth of $5$m$($kPa$).$

a$.10$

b$.50$

c$.90$

d$.100$