State the purpose of providing tunnel lining and state the factors affecting type of lining.

State the purpose of providing tunnel lining and state the factors affecting type of lining.
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1 Answer

Answer :

Purpose of tunnel lining:

1. To provide the correct desired shape to the tunnel.

2. To support the loosened rock pieces during blasting.

3. To increase the structural strength of soft places in the tunnel.

4. To improve the appearance of tunnel.

5. To prevent percolation of water inside the tunnel.

6. To reduce the maintenance cost of tunnel.

7. To house electrical fitting.

8. To withstand soil pressure when driven in soft rocks.

Factors affecting type of lining:

1. Type and nature of rocks

2. Purpose for which the tunnel is constructed

3. Funds available

4. Aesthetic consideration. 
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