Soil ground has an elastic behavior. Soil properties are $=18k\frac{N}{m^3}$ and $K_0=0\mathrm{.}4,$ and there is no ground water table. A specific point A is located at a depth

of $20m.$ The upper soil of $10m$ will be removed instantaneously for excavation.

Calculate the final $p_f$ and $q_f$ at point A after the upper soil of $10m$ is removed.

Select one:

a$.p_f=126k\frac{N}{m^2},q_f=54k\frac{N}{m^2}$

b$.p_f=180k\frac{N}{m^2},q_f=72k\frac{N}{m^2}$

c$.p_f=72k\frac{N}{m^2},q_f=180k\frac{N}{m^2}$

d$.p_f=54k\frac{N}{m^2},q_f=126k\frac{N}{m^2}$

Part b$.$ How will the stress path move?

Stress path in $p(p^{\text{'}})-$q plane

elect one:

a$.$ The stress path will move from point $A$ to point $D.$

b$.$ The stress path will move from point $A$ to point $C.$

C$.$ The stress path will move from point $C$ to point $B.$

d$.$ The stress path will move from point $C$ to point $A.$