Question

relation in friction angle and effective friction angle

Answer 1

Introduction on Friction Angle of Soils + Typical Values : Soil friction angle is a shear strength parameter of soils. ... In the stress plane of Shear stress-effective normal stress, the soilfriction angle is the angle of inclination with respect to the horizontal axis of the Mohr-Coulomb shear resistance line.

Answer 2

friction angle is a shear strength parameter
friction angle is the angle of inclination with respect to the horizontal axis of the mohr-coulomb shear resistance line