The Mohr-Coulomb failure criterion is popularly adopted in soil mechanics analysis. Give an illustrated (with a suitable sketch) description of this failure criterion, which the inclination of the plane of failure (0) to the horizontal caused by shear in a soil sample tested in a standard triaxial test is given by; e = (45 + where Ø' is the angle of effective friction.

Angle of internal friction for a given soil is the angle on the graph (Mohr's Circle) of the shear stress and normal effective stresses at which shear failure occurs. True   False

Soil mechanic

(3) A direct shear test is used to find the shear strength of a soil. For two soil samples, the vertical stresses are 100 kPa and 300 kPa, and the corresponding shear stresses at failure are 57.7 kPa and 173.2 kPa, respectively. Please determine the strength parameters of this soil. 18 L m