The Mumbai-Ahmedabad High Speed Rail project is likely to achieve a major milestone on Saturday with the final breakthrough of its NATM (New Austrian Tunnelling Method) tunnel. What is NATM➤ Unlike machine-driven tunnelling, NATM uses the surrounding ground as a natural support system➤ Concrete is sprayed on tunnel walls to stabilise the structure as work proceeds➤ Package C2, which includes this tunnel, is being executed by Afcons Infrastructure Ltd
Work status in MaharashtraStations | Work on Thane, Virar, and Boisar stations is progressing. First slabs for Virar and Boisar are completeBKC station | 83% excavation complete. Base slab casting at 100 ft depth underway at both endsViaducts | Pier foundations ongoing across multiple sites; 48 km of piers cast. Full-span box girder launching started in Palghar district
Mountain tunnels | Excavation of 7 tunnels in Palghar underway; 2.1 km of 6 km heading completedBridges | Construction has begun on Vaitarna, Ulhas and Jagani river bridges
https://timesofindia.indiatimes.com/city/mumbai/mumbai-ahmedabad-high-speed-rail-natm-tunnel-set-for-breakthrough-on-sept-20/articleshow/124010389.cms