Tunnelling Questions

• In the given figure drill holes, heading, mucking and benching are mumbered as 1, 2, 3, 4 The correct sequence is :
• The advantages of providing a pair of tunnels as compared to only one large highway tunnel is :
• For full face method, the excavation to be done is generally divided into
• 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 tunnel is found more advantageous as compared to the alternate routes because it:
• In case of railways,
• The following operations are required for tunnelling in rocky terrain : 1. Removing the foul gases 2. Marking the tunnel profile 3. Setting up and drilling 4. Checking misfire 5. Mucking The correct sequence is :
• Pick up the correct statement from the following:
• Which one of the following methods is adopted for permanent drainage of tunnels :
• For B.G. single track, the section of the tunnel must have a width
• An overhead track on a large truss frame is required in case of car changer by
• For B.G. single track railway, the height of the tunnel above top of rails should be
• 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 :
• For initial surveys of tunnels, the following activities are involved: 1. Marking portal point with concrete pillars on the ground 2. Marking tunnel obligatory points on the topographical maps 3. Preliminary setting of the tunnel on the topographical Survey of India maps 3. Driving lines between the fixed obligatory points. The correct sequence of the activities is :
• Pick up the mechanical ventilation method used for tunnels from the following:
• In the wooded bulk-head, used for mucking in steep grade tunnels,
• Concrete lining is provided concurrently with the driving operation in case of
• Pick up the correct statement from the following during tunnel excavation,
• The following tunnels were constructed in different countries for different purposes : 1. Emperor Claudius built the first Roman tunnel 2. The first highway tunnel was constructed in Hungary 3. The first underground railway tunnel was constructed in Great Britain 4. The first navigational tunnel was constructed in France. The correct chronological development of these tunnels is:
• Forepoling method is generally adopted for tunnelling in :