Exercise: Tunnelling

Questions for: Tunnelling

Forepoling method is generally adopted for tunnelling in :
A:
soft ground
B:
firm ground
C:
running ground
D:
None of these.
Answer: A
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Which one of the following statements is not correct in respect of setting of an inclined tunnel:
A:
Reference points are constructed at every 300 m.
B:
The alignment is fixed from upper/lower apex point.
C:
The level of the invert at the heading is marked by a tape.
D:
Reference points are constructed on the roof of tunnels
Answer: E
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The advantages of providing a pair of tunnels as compared to only one large highway tunnel is :
A:
economy in cost of construction
B:
avoidance of head on collisions
C:
provision of separate exit and entrance of two traffic streams
D:
facility in carrying out repairs
Answer: E
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The following operations are required for tunnelling in rocky terrain :
1. Removing the foul gases
2. Marking the tunnel profile
3. Setting up and drilling
4. Checking misfire
5. Mucking
The correct sequence is :
A:
1 2 3 4 5
B:
2 3 5 4 1
C:
4 2 1 3 5
D:
2 3 1 4 5
Answer: D
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For highways, tunnelling is preferred to if the open cut exceeds :
A:
10 metres depth
B:
15 metres depth
C:
20 metres depth
D:
25 metres depth.
Answer: B
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