Tunnelling problems
- 1. The difference of heights of the tunnels above rail tops of BG and MG tracks is kept
Options- A. 0.30 m
- B. 0.45 m
- C. 0.60 m
- D. 0.75 m Discuss
Correct Answer: 0.60 m
- 2. Which one of the following methods is generally adopted for tunnelling in firm ground
Options- A. Full face method
- B. Top heading and benching method
- C. Drift method
- D. All the above. Discuss
Correct Answer: All the above.
- 3. Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.
Options- A. Driving of tunnel is done in two portions of its section
- B. Driving the top portion is done in advance of the bottom portion.
- C. After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench.
- D. The holes in head and bench are loaded together with explosive for blasting.
- E. Firing of head holes is done just before the bench holes are fired. Discuss
Correct Answer: Firing of head holes is done just before the bench holes are fired.
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