Tunnel Engineering

Pick up the correct statement regarding drilling a tunnel from the following:

  • A. Holes are drilled by pneumatically operated rock drills
  • B. One drill is required for each 4 to 5 m2 force area
  • C. The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
  • D. All of the above
Answer: Option D.

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