One of the popular mathematical models is given by:

(1)	$\begin{array}{l}\displaystyle {\rm FBP} = p_b = 3 \, \sigma_{h, \rm min} - \sigma_{h, \rm max} + \sigma_t - p_i\end{array}$

where

$\begin{array}{l}\sigma_{h, \rm min}\end{array}$	minimal principal horizontal stress
$\begin{array}{l}\sigma_{h, \rm max}\end{array}$	maximal principal horizontal stress
$\begin{array}{l}\sigma_{t}\end{array}$	tensile stress
$\begin{array}{l}p_i\end{array}$	initial formation pressure

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