QUESTION $1$

MKAJ$1013/2$

The shear strength of soil and tested under the consolidated undrained $($CU$)$ test can be represented by the equation $=30+{}^{\text{'}}tan27$ through Effective Stress $($ES$)$ analysis. A proposed structure with a load of $76k\frac{N}{m^2}$ is planned on over consolidated clay material. The initial back pressure $($Ubp$)$ and initial confining pressure $({}_3)$ applied for each specimen were $70$kPa and $80$kPa, respectively. Solve:

i$.$ Pore water pressure developed in the specimen at failure.

ii$.$ The change in pore water pressure $(u)$

iii. Minor $({}_3)$ and major $({}_1)$ effective principal stress.