Civil Engineering - Tunnelling

Exercise : Tunnelling - Section 1
  • Tunnelling - Section 1
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:
No answer description is available. Let's discuss.

7.
For tunnels exceeding 300 m in length, the grade should be provided below
50% of the ruling gradient
60% of the ruling gradient
75% of the ruling gradient
80% of the ruling gradient.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

8.
The method of draining in the tunnels, is generally known as
foredrainage
dewatering
permanent drainage
All of the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

9.
Pick up the correct statement from the following during tunnel excavation,
Oxygen should not be less than 19.5%
Carbondioxide should not be more than 0.5%
Hydrogen sulphide should not be more than 0.001%
Carbon mono-oxide should not be more than 0.01%
All of the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

10.
To attain the required shape of the tunnel section, we use :
easers
trimmers
cut holes
chisels.
Answer: Option
Explanation:
No answer description is available. Let's discuss.