Exercise: Tunnelling

Questions for: Tunnelling

For transferring the tunnel alignment through shafts, we adopt the following steps :
1. Hanging two or more plumb lines in the shaft
2. Determining the bearing of the plumb lines i.e. plumb plane
3. Suspending a 35 kg weight by each plumb line
4. Immersing the weights of both the plumb lines in the buckets containing water.
The correct sequence of steps is :
A:
1 2 3 4
B:
4 3 2 1
C:
l 3 2 4
D:
2 1 4 3
Answer: A
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Which one of the following methods is generally used for the layout of the muck-car tracks
A:
the grass hopper method
B:
passing track method
C:
the cherry picker
D:
California crossing, Dixon conveyor
Answer: E
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Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.
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.
Answer: E
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The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than
A:
200 particles/cm3
B:
250 particles/cm3
C:
300 particles/cm3
D:
450 particles/cm3
Answer: D
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Concrete lining is provided concurrently with the driving operation in case of
A:
rock terrain
B:
soft rock
C:
running soil
D:
none of these.
Answer: A
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