A 30 cm diameter friction pile is embedded 10 m into a homogeneous consolidated deposit. Unit adhesion developed between clay and pile shaft is 4 t/m2 and the adhesion factor is 0.7. The safe load for the factor of safety 2.5 is
1
9.1 t
2
10.55 t
3
16.5 t
4
30.7 t
5
20.55 t