The most suitable soil for compressed air tunnelling is

In compressed air tunnelling, the volume of free air provided is

A

6 m³ per second per m² of face area

B

6 m³ per minute per m² of face area

C

20 m³ per minute per m² of face area

D

6 m³ per hour per m² of face area

Which one of the following methods of tunnelling does not require the use of time bearing?

A

Linear plate method

B

Shield method

C

Compressed air method

D

All of these

The length of the needle beam used in needle beam method of tunnelling is usually

A

2 m to 4 m

B

2.5 m to 6 m

C

4 m to 7 m

D

5 m to 6 m

In Belgium method of tunnelling

A

Construction of side walls is completed before invert and roof arch are built

B

Construction of roof arch is completed before side walls and inverts are built

C

Construction of invert is completed before side walls and roof arch are built

D

Construction of invert and side walls is completed before roof arch is built

Which one of the following methods is generally adopted for tunnelling in firm ground

A

Full face method

B

Top heading and benching method

C

Drift method

D

All the above

Which one of the following statements is not correct for heading and benching method of tunnelling?

A

Drilling and mucking can be done simultaneously

B

Benching provides a platform for working on heading

C

Removal of muck from the heading is very easy

D

None of these

Which one of the following statements is not correct with regard to heading and henching method of tunnelling?

A

Driving of tunnel is done in two portions of its section

B

Driving the top portion is done in advance of the bottom portion

C

The holes in head and bench are loaded together with explosive for blasting

D

Firing of head holes is done just before the bench holes are fired

Pick up the explosive used for tunnelling in soft rocks from the following:

A

Blasting gelatine

B

Special gelatine

C

Ammonia dynamite

D

Semi-gelatine

For highways, tunnelling is preferred to if the open cut exceeds:

A

10 meters depth

B

15 meters depth

C

20 meters depth

D

25 meters depth

Forepoling method is generally adopted for tunnelling in:

A

Soft ground

B

Firm ground

C

Running ground

D

None of these

The most suitable soil for compressed air tunnelling is

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