Tunnel Engineering
Redirecting of water entering the tunnel is called as
- Drainage work during construction
- Perpetual drainage work
- Pre-drainage work
- Post-drainage work
Construction of tunnels in rocks requires drilling of holes and blasting for excavation. The blasting efficiency is maximum in the
- crushing zone
- throwing zone
- fracturing zone
- shattering zone
Which of the following is the method used for tunnel construction in soft soil ground ?
- Compressed air method
- Full face method
- Heading and bench method
- Pilot tunnel method
Which is correct statement in case of lining of tunnels?
i. It supports the loosened rock pieces during blasting
ii. It gives proper section to the tunnel
iii. It strengthens the weak locations in the tunnel
- Only (i) and (ii) are correct
- Only (i) and (iii) are correct
- Only (ii) and (iii) are correct
- (i), (ii) and (iii) are correct
The permanent lining in tunnels serves which of the following purposes?
i. saves the rock from air slake
ii. adds to the structural strength in soft places
iii. gives correct shape to the tunnel
- Only (i)
- (i) and (ii)
- (ii) and (iii)
- (i), (ii) and (iii)
Tunnel Engineering
For a National Highway (NH) construction, tunnelling is preferred, if the cutting of existing ground exceeds ________________ m.
- 10.0
- 15.0
- 20.0
- 25.0
Which of the following is / are the methods of providing ventilation in a tunnel?
i. To exhaust fumes and gases those are injurious to health and explosive in nature
ii. To blow in fresh air
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Select the most suitable method of tunneling for long tunnels at great depths.
- Army method
- Austrian method
- English method
- Needle beam method
In tunnelling, recommended explosive for blasting of soft rocks is
- Ammonia dynamite
- Blasting gelatin
- Special gelatin 10 to 30%
- Semi-gelatin
In blowing led mechanical ventilation in a tunnel, the advantage is /are
i. positive supply of fresh air at working place is obtained
ii. vitiated air, smoke and dust are removed slowly
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Tunnel Engineering
The Drift method of tunneling is best suited for
- Rock ground
- Running ground
- Soft ground
- Broken ground
Which of the following is/are example(s) of ‘tunnelling through soft ground’?
i. Forepoling method
ii. Needle Beam method
iii. Head and benching method
- Only (i)
- (i) and (ii)
- (ii) and (iii)
- (i), (ii) and (iii)
Which one of the following tunneling methods is used for laying underground sewers?
- Needle Beam Method
- German Method
- Army Method
- None of the above
What shape of the tunnel would be best suited for soft rocks?
- Segmental roof section
- Horse-shoe section
- Circular
- Egg-shaped
Which of the following statements are true for ‘Tunnel Shafts’?
i. These are sunk along the line of a tunnel at one or more points between the entrances to permit the tunnel excavation to be attacked at several points at the same time
ii. They provide opening for removal of the excavated material
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Tunnel Engineering
Resonators are used in tunnels for the purpose of
- Noise control
- Drainage control
- Dust control
- Ventilation control
Select the most suitable shape of the tunnel to be made in soft grounds
- Egg shaped
- Horse-shoe shaped
- Circular section
- Segmental roof section
The mechanical ventilation method used in tunnels consists of
(i) Providing exhaust air by ducts
(ii) Blowing fresh air
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Which of the following method(s) can be used for tunnelling in soft soil?
i. Forepoling method
ii. Needle beam method
iii. Heading and benching method
- Only (i)
- (i) and (ii)
- (ii) and (iii)
- (i), (ii) and (iii)
In case of long tunnels, the drainage system consists of sump wells which are located at a regular interval of about
- 50 m to 100 m
- 100 m to 200 m
- 200 m to 300 m
- 300 m to 500 m
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