Discussion :: Tunneling
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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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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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Answer : Option E
Explanation :
No answer description available for this question.
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