If s is the shear strength, c and $ϕ$ are shear strength parameters, and $σ_{n}$ is the normal stress at failure, then Coulomb's equation for shear strength of the soil can be represented by

- 1
  
  $c = s + σ_{n} \tan ϕ$
- 2
  
  $c = s - σ_{n} \tan ϕ$
- 3
  
  $s = σ_{n} + c \tan ϕ$
- 4
  
  $s = c - σ_{n} \tan ϕ$

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