Civil Engineering - Tunnelling

Exercise :: Tunnelling - Section 1

  • Tunnelling - Section 1
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:

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7. 

For tunnels exceeding 300 m in length, the grade should be provided below

A. 50% of the ruling gradient
B. 60% of the ruling gradient
C. 75% of the ruling gradient
D. 80% of the ruling gradient.

Answer: Option C

Explanation:

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8. 

The method of draining in the tunnels, is generally known as

A. foredrainage
B. dewatering
C. permanent drainage
D. All of the above.

Answer: Option D

Explanation:

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9. 

Pick up the correct statement from the following during tunnel excavation,

A. Oxygen should not be less than 19.5%
B. Carbondioxide should not be more than 0.5%
C. Hydrogen sulphide should not be more than 0.001%
D. Carbon mono-oxide should not be more than 0.01%
E. All of the above.

Answer: Option E

Explanation:

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10. 

To attain the required shape of the tunnel section, we use :

A. easers
B. trimmers
C. cut holes
D. chisels.

Answer: Option B

Explanation:

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