As per converse Labarre formula, group efficiency of friction piles is given by:

where

m = number of columns

n = number of rows

$α = \tan^{- 1} (d / s) (i n d e g r e e)$

d = diameter of pile

s = c/c spacing of pile

- 1
  
  $1 - \frac{α}{90} [\frac{(n - 1) m + (m - 1) n}{m n}]$
- 2
  
  $1 - \frac{α}{90} [\frac{(n + 1) m + (m + 1) n}{m n}]$
- 3
  
  $1 - \frac{α}{90} [\frac{(n - 1) m - (m - 1) n}{m n}]$
- 4
  
  $1 - \frac{α}{90} [\frac{(n + 1) m - (m + 1) n}{m n}]$

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