Exercise: Tunnelling

Questions for: Tunnelling

For tunnels exceeding 300 m in length, the grade should be provided below
A:
50% of the ruling gradient
B:
60% of the ruling gradient
C:
75% of the ruling gradient
D:
80% of the ruling gradient.
Answer: C
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Pick up the correct statement regarding drilling a tunnel from the following:
A:
Holes are drilled by pneumatically operated rock drills
B:
One drill is required for each 4 to 5 m2 force area
C:
The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
D:
All of the above.
Answer: D
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For B.G. single track railway, the height of the tunnel above top of rails should be
A:
5.5 m to 5.8 m
B:
5.8 m to 6.2 m
C:
6.7 m to 7.3 m
D:
7.3 m to 7.5 m
Answer: C
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A tunnel is found more advantageous as compared to the alternate routes because it:
A:
remains free from snow
B:
reduces the cost by reducing the route distance
C:
reduces the maintenance cost
D:
avoids interference with surface rights
Answer: E
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In case of drift method of tunnelling, the drift may be excavated at
A:
the centre
B:
the bottom
C:
the top
D:
the side
Answer: E
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