Problem $4$

Refer to the soil profile shown below.

a$)$ Calculate and plot the variation of total vertical stress, pore water pressure, and effective

vertical stress with depth.

b$)$ If the water table rises to the top of the ground surface, what is the change in the effective

stress at the bottom of the clay layer?

c$)$ If the water table rises to $10ft$ above the ground surface, what is the change in the effective

stress at the bottom of the clay layer, as compared to Problem $4-$b$?$

d$)$ How many feet must the groundwater table rise to decrease the effective stress by $300psf$ at

the bottom of the clay layer?

$e=0\mathrm{.}49$

$G_s=2\mathrm{.}68$

Groundwater table

$e=0\mathrm{.}9$

$G_s=2\mathrm{.}75$