Question

the effective stress friction angle of a saturated cohesionless soil is 25 the ratio of shear stress to normal effective stress on the failure plane is

Answer 1

Friction angle = tan -1 (shearstree/normal stress).

Therefore  ratio of shear stress to normal effective stress on the failure plane is= tan 250=0.466.Keeping in view that; the effective stress friction angle of a saturated cohesionless soil is 25.

The ratio of shear stress to normal effective stress on the failure plane is 0.466.