Railway tunnels are generally

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

A

Foredrainage

B

Dewatering

C

Permanent drainage

D

All of the above

Which of the following lining material is useful for shield driven tunnels in sub aqueous regions?

A

Stone masonry

B

Timber

C

Cast iron

D

Cement concrete

Which of the following methods of tunneling is used for long tunnels at great depths?

A

Army method

B

Needle beam method

C

Austrian method

D

English method

The tunnels, the artificial underground passages are constructed for:

A

Highways

B

Railways

C

Sewerage

D

All the above

Circular section of tunnels is not suitable for

A

Carrying water

B

Non-cohesive soils

C

Tunnels driven by shield method

D

Placement of concrete lining

Which one of the following linings is suitable for shield driven tunnels particularly in the sub-aqueous regions?

A

Brick lining

B

Stone lining

C

Timber line

D

Cast iron lining

In the wooded bulk-head, used for mucking in steep grade tunnels,

A

One opening is provided

B

Two openings are provided

C

Three openings are provided

D

No opening is provided

Ribs are used for strengthening and stiffening the liner plate for tunnels of diameter greater than

A

2 m

B

3 m

C

4 m

D

5 m

The advantages of providing a pair of tunnels as compared to only one large highway tunnel is:

A

Economy in cost of construction

B

Avoidance of head on collisions

C

Provision of separate exit and entrance of two traffic streams

D

All the above

Which one of the following methods is adopted for permanent drainage of tunnels?

A

Provision of longitudinal drains

B

Continuous open drains

C

Concrete lining

D

All the above

Railway tunnels are generally

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