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Approach road and portal building at the Atal Tunnel.
TunnelsHighways

Atal Tunnel, Rohtang

A 9.02 km highway tunnel beneath the Rohtang Pass, linking Manali with Lahaul-Spiti all year round.

Himachal Pradesh Advisor to BRO, nominated by DMRC

Photo: Jagseer S Sidhu · CC BY-SA 4.0

Prior-role experience. The projects and credentials presented represent the professional experience of Devstrat's leadership in previous roles. They are not represented as projects executed by Devstrat Private Limited.

Overview

The Atal Tunnel runs beneath the Rohtang Pass, giving the Lahaul-Spiti valley all-weather road access and cutting travel time by up to four hours.

Prof. (Dr.) H. R. Yadav served as advisor to the Border Roads Organisation, nominated by DMRC.

Engineering challenges

  • Himalayan geology: schist, gneiss, phyllite and quartzite with faults
  • Seri Nala fault zone with water ingress above 100 l/s
  • Ventilation and fire safety along a 9 km bore at altitude

Photo gallery

Approach road and portal building at the Atal Tunnel.
Approach road and portal building at the Atal Tunnel.Photo: Jagseer S Sidhu · CC BY-SA 4.0 · Wikimedia Commons
The north portal of the Atal Tunnel.
The north portal of the Atal Tunnel.Photo: Jagseer S Sidhu · CC BY-SA 4.0 · Wikimedia Commons
Entry gate to the tunnel in winter.
Entry gate to the tunnel in winter.Photo: 9161Ankur · CC BY-SA 4.0 · Wikimedia Commons

Photos are openly licensed images from Wikimedia Commons, used under the licence shown with each photo. They are not Devstrat's own photographs. All photo credits

Technical case study

Cross-section · horseshoe, single tube, two-laneAtal Tunnel cross-section: 10.5 m wide, 8 m carriageway, 5.525 m clearance, ventilation duct above and 3.6 × 2.25 m egress tunnel below
9.02 kmLengthSingle tube, two-way traffic
~3,000 mAltitudePortals at ~3,060 m (south) and ~3,071 m (north)
10.5 mWidth8 m carriageway; 5.525 m clearance
80 km/hDesign speedUp to 3,000 vehicles a day, all-weather
46 kmRoute savingTravel time cut by up to 4 hours
3.6 × 2.25 mEgress tunnelBelow the pavement; access every 500 m
ClientBorder Roads Organisation (Ministry of Defence)
Design & PMSMEC
ContractorAfcons–STRABAG JV

Technical data: SMEC project information; Indian Infrastructure, December 2020.

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RoleTechnical Head – Planning, Design & Execution View project

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