Question

The Mohr-Coulomb theory can be expressed algebraically by, which of the following equation.

(a) S = c + σ tan φ

(b) τf = s = F(σ)

(c) s = F(σ)

(d) τf = F(σ)

I had been asked this question at a job interview.

My doubt stems from Mohr in portion Shear Strength of Geotechnical Engineering I

Answer 1

Correct option is (b) τf = s = F(σ)

To explain I would say: The Mohr-Coulomb failure theory can be expressed algebraically by the equation:τf = s = F (σ)

Where, τf = s=shear stress on failure plane, at failure=shear resistance of material

F (σ) = function of normal stress.