Correct Answer : Full face method
Explanation : Rock tunneling involves the same principle as of the tunneling in the ground. Those include full face method, top heading method and drift method. Based on the conditions of the area, these can be adopted.
Correct Answer : Option (D) : 2N + 2
Correct Answer : Option (A) : Fire-setting
Explanation : Blasting is the conventional method which is adopted in case of rock tunneling. In the case of fire-setting, tunnel is heated with fire and then cooled with water. Rapid expansion and contraction weakens and rock and tends to break.
Correct Answer : Option (C) : Marking profile
Explanation : Rocky strata involve usage of blasting method for developing tunnels. The sequence contains marking profile, loading explosive, removing foul gases, checking, scaling, mucking and bolting.