Civil Engineering - Tunnelling - Discussion

Discussion :: Tunnelling - Section 1 (Q.No.6)

6. 

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

Explanation:

No answer description available for this question.

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