en.Wedoany.com Reported - L&T (Larsen & Toubro) has achieved the breakthrough of Mountain Tunnel 07 (MT-07) on the C-3 package of the Mumbai-Ahmedabad High-Speed Rail (MAHSR) project, marking the company's third tunnel completion in five months. The 417-meter-long tunnel, located in the Sahyadri range near Ambesari village in Dahanu Taluka, Maharashtra, was constructed using the New Austrian Tunneling Method (NATM) and 117 controlled blasts over a period of 516 days.

The tunnel, with a width of 12.6 meters designed to accommodate dual tracks for both up and down lines, was built under challenging geological conditions. Continuous monitoring and support systems, including shotcrete, rock bolts, and lattice girders, were deployed during construction, along with advanced instruments such as 3D targets, seismographs, and surface settlement points to ensure safe operations.

The MAHSR C-3 package spans 135.45 kilometers, extending from Shilphata in Thane to Zaroli on the Maharashtra-Gujarat border. This package includes three high-speed rail stations at Thane, Virar, and Boisar, approximately 124 kilometers of viaducts, seven mountain tunnels totaling 6 kilometers in length, 2.3 kilometers of steel bridges, and 5 kilometers of special geotechnical structures. This tunnel breakthrough marks a significant milestone in the construction of India's first high-speed rail corridor.

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