A question in GATE 2012 Mining Engineering Paper with Solution has been updated:
An opencast mine bench has a potential failure plane AC as indicated in figure. Bolts are installed to stabilize the failure plane providing a resultant bolting force of 300 kN. The area of sliding block ABC is 37.45
. The unit weight, cohesion and angle of internal friction of rock are 25
20 kPa and
respectively.

The factor of safety of slope when bolts are installed perpendicular to the failure plane is
- 1.08
- 0.79
- 1.78
- 3.46
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