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Civil Engineering - Tunnelling - Discussion

Discussion Forum : Tunnelling - Section 1 (Q.No. 6)
Tunnelling
6.
Pick up the correct statement regarding drilling a tunnel from the following:
Holes are drilled by pneumatically operated rock drills
One drill is required for each 4 to 5 m2 force area
The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
All of the above.
Answer: Option
Explanation:
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