Which one of the following statements is not correct with regard to heading and henching method of tunnelling?
A. Driving of tunnel is done in two portions of its section
B. Driving the top portion is done in advance of the bottom portion
C. The holes in head and bench are loaded together with explosive for blasting
D. Firing of head holes is done just before the bench holes are fired
Answer: Option D
This Question Belongs to Civil Engineering >> Tunnel Engineering
A. (i) and (ii) are correct
B. (iii) and (iv) are correct
C. (i) and (iv) are correct
D. (ii) and (iii) are correct
Which of the following lining material is useful for shield driven tunnels in sub aqueous regions?
A. Stone masonry
B. Timber
C. Cast iron
D. Cement concrete
Which of the following methods of tunneling is used for long tunnels at great depths?
A. Army method
B. Needle beam method
C. Austrian method
D. English method
A. Only up holes
B. Only down holes
C. Horizontal or up holes
D. Horizontal down or up holes
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