Question

Forepoling method is generally adopted for tunnelling in
1. Soft ground
2. Firm ground
3. Running ground
4. Rock Ground

Answer 1

Correct Answer - Option 3 : Running ground

Explanation:

Running ground requires instant support throughout the excavation. Examples include dry sand, gravel, silt, mud, and water-bearing sand.

Method of tunneling in running ground

1. Forepoling method
2. Linear plate method
3. Needle beam method
4. American method
5. English method
6. Austrian method
7. Belgian method
8. Flying arch

Method of tunneling in hard rocks-

1. Full face method
2. Heading and bench method
3. Pilot tunnel method
4. Perimeter method of tunneling