According to Rankine's alalysis, minimum depth of foundation is equal to

where q = imtemsotu of loading

y = unit weight of soil

$ϕ$ = angle of internal friction

- 1
  
  $\frac{q}{y} {(\frac{1 + \sin ϕ}{1 - \sin ϕ})}^{2}$
- 2
  
  $\frac{q}{y} {(\frac{1 - \sin ϕ}{1 + \sin ϕ})}^{2}$
- 3
  
  $\frac{q}{y} (\frac{1 + \sin ϕ}{1 - \sin ϕ})$
- 4
  
  $\frac{q}{y} (\frac{1 - \sin ϕ}{1 + \sin ϕ})$

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