Wednesday, July 9, 2008



This tunnel project was conceived way back in 1983 in view of the need to provide an all weather route to Leh and Lahaul & Spiti valley in Himachal Pradesh. Rohtang pass, located 51 km away from Manali, is at an altitude of 3978.0 m (13044 ft) and has been posing serious problem in maintaining the road communication for more than four months in a year, It faces heavy snow fall activity, high velocity winds and sub-zero temperature. Accordingly, feasibility study for the construction of Tunnel across Rohtang pass conducted by M/S RITES. Detail Project Report (DPR) has been submitted for obtaining formal approval from cabinet committee on security. Formal approval for the project is yet awaited. Salient features of the proposed Rohtang Tunnel are given as under:-

Length of Tunnel
9 km
Shape of Tunnel
Horse Shoe shape. Finished width 10.00 m at road level. (8.00 m pavement and 1.00 m footpath on both the sides)
General altitude of the tunnel
It lies between 3000-3100 m altitude
Design speed
80 km/h

Geology of Tunneling media
Uniformally dipping alternate sequence of Quartzites, Quartzitc Schists, Quartz-Diolite-Schist with thin bands.
Temperature variation in the area
25-300 C during May-June

-200 C to -20 C during Dec-Jan
Maximum-1900 m

Average more than 600 m
Construction technique proposed
Drill & Blast with NATM
Support System proposed
Fibre reinforced concrete (100 to 300 mm thick) combined with rock bolt (26.50mm dia 5000 mm to 9000 mm long) has been proposed as principal support system. In poor rock condition yieldable steel ribs (ISMB 150/ISMB 300) have been proposed in addition.
Tunnel ventilation
Semi transverse system of ventilation system has been proposed. Following parameters have been taken in design:-

Upper tolerance limit for concentration

Visibility factor

3000 Nos

1500 Nos

Peak hour traffic
337.50 PCUs

Design vehicular speed in Tunnel

Maximum Speed
80 km/ph

Minimum Speed
30 km/ph
Project Cost

Approximately Rs. 1700 Crore

Approach road to the two ends are required to be constructed to connect the Tunnel proper with the Manali-Leh road and also to mobilize the resources for construction of Tunnel, Initially, only access roads with minimum necessary specifications for mobilization of resources will be constructed. Later the same will be developed to National Highway Double Lane specifications and will then be called as approach road. Formation, surfacing and permanent works are under progress and the upto date progress of approach road is given as under:-

Formation Cutting - 59 %

Surfacing Works - 16 %

Permanent Works


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