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Civil Engineering - Tunnelling

Exercise : Tunnelling - Section 1
  • Tunnelling - Section 1
21.
Which one of the following statements is not correct in respect of setting of an inclined tunnel:
Reference points are constructed at every 300 m.
The alignment is fixed from upper/lower apex point.
The level of the invert at the heading is marked by a tape.
Reference points are constructed on the roof of tunnels
None the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Forepoling method is generally adopted for tunnelling in :
soft ground
firm ground
running ground
None of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Concrete lining is provided concurrently with the driving operation in case of
rock terrain
soft rock
running soil
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than
200 particles/cm3
250 particles/cm3
300 particles/cm3
450 particles/cm3
400 particles/cm3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.
Driving of tunnel is done in two portions of its section
Driving the top portion is done in advance of the bottom portion.
After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench.
The holes in head and bench are loaded together with explosive for blasting.
Firing of head holes is done just before the bench holes are fired.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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