The critical height of an unsupported vertical cut in a cohesive soil is given by

Where C= unit cohesion

$ϕ$ = angle of internal friction

$γ$ = unit weight of soil

- 1
  
  $\frac{4 C}{γ} \tan (45^{o} + \frac{ϕ}{2})$
- 2
  
  $\frac{2 C}{γ} \tan (45^{o} + \frac{ϕ}{2})$
- 3
  
  $\frac{4 C}{γ} c o t (45^{o} + \frac{ϕ}{2})$
- 4
  
  $\frac{2 C}{γ} c o t (45^{o} + \frac{ϕ}{2})$

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