The excavation of Rohtang Tunnel is done on the basis of NATM (New Austrian Tunnelling method). This method can be described as "Design as you monitor" approach, by providing support to the tunnel on the basis of Rock class. The NATM has following sequence:
1. Drilling and blasting.
2. De-fuming (it takes 30 minutes)
3. Mucking and scaling.
4.Primary shotcreting with M40 grade concrete.
5. Installation of square wire mesh throughout the tunnel.
6. Lattice girder installation.
7. Secondary shotcreting with M40 grade concrete reinforced with steel fibres.
8. Drilling holes for Rock bolts.
9. Inserting Rock bolts.
10. Cement grouting of Rock bolts.
11. Tunnel final lining with reinforced M35 grade concrete.
I'll explain each process in detail.
1. Drilling and blasting.
2. De-fuming (it takes 30 minutes)
3. Mucking and scaling.
4.Primary shotcreting with M40 grade concrete.
5. Installation of square wire mesh throughout the tunnel.
6. Lattice girder installation.
7. Secondary shotcreting with M40 grade concrete reinforced with steel fibres.
8. Drilling holes for Rock bolts.
9. Inserting Rock bolts.
10. Cement grouting of Rock bolts.
11. Tunnel final lining with reinforced M35 grade concrete.
I'll explain each process in detail.
hey read your blog it's really cool can you help me in making a training report on rohtang tunnel..
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