A granular soil deposit is $5\mathrm{.}0m$ thick and underlying it is a clay having a thickness of $5\mathrm{.}5m.$ There is water table

at the interface od the soil and clay. Unit weight of dry sand is $16\mathrm{.}5K\frac{N}{m^3}$ and the saturated unit weight of sand

anf clay are $17\mathrm{.}5K\frac{N}{m^3}$ and $18\mathrm{.}5K\frac{N}{m^3},$ respectively.

What is the effective stress at the bottom of the clay?

a$)184\mathrm{.}25$Kpa

b$)125\mathrm{.}95$Kpa

c$)86\mathrm{.}245$Kpa

d$)178\mathrm{.}75$KPa

If the water table rises to the level of the soil surface, what is the effective stress at the bottom of the

clay?

a$)184\mathrm{.}25$Kpa

b$)125\mathrm{.}95$Kpa

c$)86\mathrm{.}245$Kpa

d$)178\mathrm{.}75$KPa

If the water is is $2\mathrm{.}5m$ abovethe soil surface, what is the total stress at the bottom of the clay?

a$)178\mathrm{.}75$Kpa

b$)184\mathrm{.}25$Kpa

c$)127\mathrm{.}53$Kpa

d$)213\mathrm{.}775$KPa

Determine the pore water pressure at the bottom.

a$)178\mathrm{.}75$Kpa

b$)184\mathrm{.}25$Kpa

c$)127\mathrm{.}53$Kpa

d$)213\mathrm{.}775$KPa

Find the effective stress at the bottom of the clay.

a$)184\mathrm{.}25$Kpa

b$)125\mathrm{.}95$Kpa

c$)86\mathrm{.}245$Kpa

d$)178\mathrm{.}75$KPa