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Civil Engineering - Tunnelling - Discussion

Discussion Forum : Tunnelling - Section 1 (Q.No. 25)
Tunnelling
25.
Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.
Driving of tunnel is done in two portions of its section
Driving the top portion is done in advance of the bottom portion.
After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench.
The holes in head and bench are loaded together with explosive for blasting.
Firing of head holes is done just before the bench holes are fired.
Answer: Option
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