Civil Engineering :: Tunneling
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Which one of the following statements is not correct in respect of setting of an inclined tunnel:
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Forepoling method is generally adopted for tunnelling in :
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Concrete lining is provided concurrently with the driving operation in case of
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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
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Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.
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Which one of the following methods is generally used for the layout of the muck-car tracks
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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 : -
For full face method, the excavation to be done is generally divided into
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The tunnels, the artificial underground passages are constructed for :
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A.
Driving of tunnel is done in two portions of its section
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B.
Driving the top portion is done in advance of the bottom portion.
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C.
After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench.
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D.
The holes in head and bench are loaded together with explosive for blasting.
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E.
Firing of head holes is done just before the bench holes are fired.
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