Tunnel Engineering

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.
Explanation: 

IS 14665 gives details about elevators. It specifies the number, capacityof elevator and number of floors to be served.

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