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Northern Railway achieves breakthrough on 10.2 km tunnel in J&K’s Ramban

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Northern Railway achieves breakthrough on 10.2 km tunnel in J&K’s Ramban

On the 111-km-long, still-under-construction Banihal-Katra Railway link, Northern Railway has made considerable progress by breaking through T-48 tunnel, the fourth-longest tunnel in Indian Railways, between Sangaldan and Sumber stations. The line and level of the tunnel were precisely obtained during the breakthrough, which was carried out by launching an explosion while being supervised by the Northern Railways CEO.

24 cross-passages connect the 10.186 km main tunnel and 9.788 km escape tunnel that make up the T-48. It has been constructed in accordance with international standards, and plans have been established for emergency rescue and relief operations.

Sumbar Station Yard on the north side and Bridge No. 1 at Dharam village Chinji Nala on the south side are connected by the horseshoe-shaped tunnel. The tunnel’s excavation work was initiated from two ends: Kohli Entrance and Dharma Pravesh Darwaza (328 metres) (829 m).

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The Chinji Nala runs between T-47P-2 and T-48P-1 near the southern end of tunnel T-48, where the Ramban formation of the Young Himalayas and the Muri Thrust are located.

The Chenab River’s tributaries, such as the Bhimdasa, Bagdisha, and Kohli Nalapass along it, make mining a particularly difficult process. Being the longest drive at 3,940 metres, Dharam to South Drive makes it challenging to maintain a highly ventilated entrance to mining activities and works.

Due to the North Drive’s high slope, weak shear mass, poor terrain, heavy penetration of water up to 350-400 litres in the north, and constant pumping of water from inside the tunnel towards the northern portal, the drive proved challenging.

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