Boussinesq's influence factor for vertical pressure at depth z and at the centre of a circular area of diameter 'a' carrying uniformly distributed load is

- 1
  
  ${[1 - \frac{1}{1 + (\frac{a}{z})}]}^{\frac{3}{2}}$
- 2
  
  $\frac{3}{2 π} {[\frac{1}{1 + {(\frac{a}{z})}^{2}}]}^{\frac{5}{2}}$
- 3
  
  $1 - {[\frac{1}{1 + {(\frac{a}{z})}^{2}}]}^{\frac{3}{2}}$
- 4
  
  $1 - {[\frac{1}{1 + {(\frac{a}{2 z})}^{2}}]}^{\frac{3}{2}}$

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