Question

Which of the following is coulomb’s strength equation?

(a) S = c + tan φ

(b) C = s + c tan φ

(c) S = c + σ tan φ

(d) S = tan φ

I had been asked this question in class test.

My question is based upon Mohr topic in portion Shear Strength of Geotechnical Engineering I

Answer 1

Right option is (c) S = c + σ tan φ

The best explanation: Coulomb defined the function F (σ) as a linear function of σ and gave the following strength equation:

S = c + σ tan φ.