If the net ultimate bearing capacity of soil is Qmu . the gross safe bearing capacity of soil QS is given by:
(notations: F - factor of safety. γ - unit weight of soil and Df - depth of foundation)
1
\(\rm Q_S=\frac{Q_mu}{F}+\gamma D_f\)
2
\(\rm Q_S=\frac{(Q_mu-\gamma D_f)}{F}\)
3
\(\rm Q_S=\frac{Q_mu}{F}-\gamma D_f\)
4
\(\rm Q_S=\frac{(Q_mu+\gamma D_f)}{F}\)