Question $5(20$ marks$)$

State the Mohr$-$Coulomb shear strength equation and define the terms in the equation.

$[3]$

b$)$ Mention the type of laboratory triaxial test that would be suitable in each of following field conditions;

$[3]$

i$.$ The stability of a foundation footing constructed rapidly in saturated clay.

ii$.$ Long$-$term stability of a slope in clay.

iii. Rapid construction of an embankment on a natural slope.

R$)$ A direct shear test was carried out on a soil sample and the results in the table below were obtained. What would be the deviator stress at failure if a triaxial test is carried out on the same soil with cell pressure of $150k\frac{N}{m^2}.$

$[5]$

$\backslash$table$[[$Normal Stress $(k\frac{N}{m^2}),150,250],[$Shear Stress $(k\frac{N}{m^2}),110,120]]$

Question $5(20$ marks$)$

State the Mohr$-$Coulomb shear strength equation and define the terms in the equation.

$[3]$

b$)$ Mention the type of laboratory triaxial test that would be suitable in each of following field conditions;

$[3]$

i$.$ The stability of a foundation footing constructed rapidly in saturated clay.

ii$.$ Long$-$term stability of a slope in clay.

iii. Rapid construction of an embankment on a natural slope.

R$)$ A direct shear test was carried out on a soil sample and the results in the table below were obtained. What would be the deviator stress at failure if a triaxial test is carried out on the same soil with cell pressure of $150k\frac{N}{m^2}.$

$[5]$

$\backslash$table$[[$Normal Stress $(k\frac{N}{m^2}),150,250],[$Shear Stress $(k\frac{N}{m^2}),110,120]]$