A a tri-axial test was carried out for the same siltstone material.

It was found out that the cohesion (C’) of the siltstone is 8 MPa. Determine the friction angle ϕ’ of the siltstone.

(Type your answer in degrees)

Hint:

Draw a Mohr circle for the failure state of the UCS test  and then draw the Mohr-coulomb failure envelope for the siltstone in the same graph sheet.

Which of the following stress-strain response can be expected during an unconsolidated-undrained (UU) test?

The maximum shear stress τ_max, for a soil mass is equal to ___________

Which of the following is not true for unconsolidated-undrained (UU) test?

The deviator stress Δσ is given by __________

State whether the following sentence is true or false.

We should use the soil at plastic limit to determine the linear shrinkage.

Moisture content (w %) of a soil sample is express as:

State whether the following sentence is true or false considering the liquid limit test

Liquid limit (LL) = moisture content at 30 blow counts

During linear shrinkage test, if the mould length is 250 mm and air dry sample length is 230 mm. What is the measured linear shrinkage (as a %)?