For highways, tunnelling is preferred to if the open cut exceeds :
Pick up the explosive used for tunnelling in soft rocks from the following :
For full face method, the excavation to be done is generally divided into
The following tunnels were constructed in different countries for different purposes :
Emperor Claudius built the first Roman tunnel
The first highway tunnel was constructed in Hungary
The first underground railway tunnel was constructed in Great Britain
The first navigational tunnel was constructed in France.
The correct chronological development of these tunnels is:
The following operations are required for tunnelling in rocky terrain :
Removing the foul gases
Marking the tunnel profile
Setting up and drilling
Checking misfire
Mucking
The correct sequence is :
The tunnels, the artificial underground passages are constructed for :
The following operations are generally employed for tunnelling in hard rock.
Removing ground water,
Loading holes and firing the explosive
Setting up and drilling
Grouting and lining
Removing muck
Ventilation and removing explosion dust
The correct sequence is :
The advantages of providing a pair of tunnels as compared to only one large highway tunnel is :
For B.G. single track, the section of the tunnel must have a width
For B.G. single track, the section of the tunnel must have a width
Which one of the following statements is not correct in respect of setting of an inclined tunnel:
Forepoling method is generally adopted for tunnelling in :
Concrete lining is provided concurrently with the driving operation in case of
High pressure grouting is generally restored for concreting in the lining if the rock strata is:
Which one of the following statements is not correct for heading and benching method of tunnelling ?
The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than
For hauling muck from the tunnel, the following type of muck-car is used :
The difference of heights of the tunnels above rail tops of BG and MG tracks is kept
Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.
Which one of the following methods is adopted for permanent drainage of tunnels :