Recently an under-construction Silkyara-Barkot Tunnel in Uttarkashi District, Uttarakhand collapsed. This trapped 41 workers inside.
Silkyara-Barkot Tunnel is part of Chaar Dham’s all-weather road project. The construction of the tunnel was carried out by Navayuga Engineering Company. It is owned by the Ministry of Road Transport and Highways, Government of India.
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Possible Causes of Tunnel Collapse
- Fractured Rock: There might be a hidden patch of Fractured or Weak rock, undetectable during construction. Water seepage through this compromised rock could have eroded it over time, creating an unseen void atop the tunnel structure.
- Design Error: Every long tunnel should have a backup exit, which was missing in this tunnel’s design.
- Fragile Ecosystem: The recent tunnel collapse incident raises concerns regarding the feasibility of heavy construction in the delicate Himalayan ecosystem.
Tunnel Excavation Techniques:
- Drill and Blast Method (DBM): Involves drilling holes into rock and detonating explosives to break it apart.
- DBM is often used in regions like the Himalayas (Jammu & Kashmir and Uttarakhand) due to the challenging terrain.
- Tunnel-Boring Machines (TBMs): They bore through rock while supporting the tunnel behind with precast concrete segments. It is a more expensive but safer method.
- TBMs are ideal when the rock cover is up to 400 metres tall. Underground tunnels for the Delhi Metro were dug using a TBM at shallow depth.
Steps that should be taken to avoid such mishaps in the future
- Adhering to International Standards: While drilling rocks in the Himalayan Ecosystem, we should stick to international standards. According to international standards, there should always be backup exits in tunnels of such length.
- Risk Assessment and Preparedness:
- Conducting third-party risk assessment periodically, considering geological, environmental, and usage factors.
- Developing contingency plans and emergency protocols in case of any structural concerns
- Technology Integration: Explore innovative technology like Artificial Intelligence, Drones, or robotics for more efficient inspection, maintenance, and early detection of potential issues
Other Major Tunnels in India
- Atal Tunnel (Rohtang Tunnel): Located under the Rohtang Pass in the eastern Pir Panjal range of the Himalayas on the Leh-Manali Highway in Himachal Pradesh, the Atal Tunnel, also known as Rohtang Tunnel, holds the record as the world’s longest tunnel above 10,000 feet (3,048 m), with a length of 9.02 km.
- Pir Panjal Railway Tunnel: Extending over 11.2 km, the Pir Panjal Railway Tunnel is India’s lengthiest transportation railway tunnel. It traverses the Pir Panjal mountain range, connecting Quazigund and Baramulla.
- Jawahar Tunnel (Banihal Tunnel): Also known as Banihal Tunnel, Jawahar Tunnel spans a length of 2.85 km. This tunnel ensures year-round road connectivity between Srinagar and Jammu.
- Dr Syama Prasad Mookerjee Road Tunnel (Chenani-Nashri Tunnel): Formerly referred to as the Chenani-Nashri Tunnel, this road tunnel is India’s lengthiest, measuring 9.3 km. Now known as Dr Syama Prasad Mookerjee Road Tunnel, it plays a crucial role in enhancing road connectivity.
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