“Make the Atal Tunnel venture a case review for the whole world” — words by none other than our very possess Key Minister, Narendra Modi, go out of their way to inform us how important and productive this undertaking has been.
But then the inquiries occur — what is the Rohtang Tunnel project? Why did we want it in the 1st spot? How is it beneficial to us at all? Effectively, do not be concerned, as opposed to the well-liked belief, the responses will arrive walking to you for this one!
The What and the Why?
The Rohtang Tunnel, or the Atal Tunnel, is a highway tunnel created under the Rohtang Pass in the jap Pir Panjal range. Named soon after our former Key Minister Atal Bihari Vajpayee who initiated the construction approach, this tunnel is the longest tunnel ever manufactured previously mentioned the elevation of about 3100m, which can make this venture even more marvellous!
The tunnel minimizes the journey time and total distance in between Manali and Keylong, on the way to Leh. The route, which previously went through Gramphu, was 116 km lengthy and took 5 to six several hours in very good problems. The traveller now reaches the South Portal of the tunnel from Manali, a length of 24.four km in about fifty minutes, goes by means of the nine.02 km lengthy tunnel in about 15 minutes and reaches Keylong which is 45 km absent in about sixty minutes.
The new route by means of the tunnel delivers down the whole length travelled to 78.forty two km which can be protected in about 2 hrs and 5 minutes, a reduction of close to 3 to 4 several hours when in comparison to the before route. And if that’s not good adequate, the tunnel bypasses most of the web sites that were prone to road blockades, avalanches and targeted traffic snarls. Therefore escalating the security of the travellers and even more decreasing their travel time. The closing price of the complete task is near to ₹3,two hundred crores, soon after the whole venture currently being revised 3 moments.
A marvel of Civil Engineering — an incredible feat!
The journey for all wonderful achievements is achieved with hardships — difficulties that ended up confronted, solved and get over. This venture was no various, getting problems, even a lot more, tougher than the usual.
The substantial altitude, topography, low temperatures, h2o ingress — you name it. The development of the Atal Tunnel was no effortless activity. But like always, the Border Road Group (BRO!) solved these issues placing yet one more instance of engineering.
Some of the numerous roadblocks confronted had been –
Drinking water Ingression — Seri Nullah (or Seri Nalah), a glacier-fed rivulet flowing via tunnel cavities induced all the menacing drinking water ingress on the south portal of the tunnel.
Extremely Minimal Temperatures — Such low temperatures experienced imposed the need to have for particular, strengthened concrete. The state of affairs during the winters was even worse, where even the entry route to the south portal essential steady snow clearance.
Topographical Layout — The peculiar topography of the mountain selection by means of which the tunnel is being excavated precludes any useful likelihood of a shaft or adit. This intended the excavation could be attempted only from the two portals, of which the North Portal is not accessible for more than half the yr.
Learnings in progress
The Rohtang Tunnel is facing serious problems owing to the way the venture has been conceived. The tunnel format with a uni-directional twin-tube would have probably essential a less difficult assistance method and a single of the tubes could have been employed to open a lot more excavation faces for the other tube, specifically in the stretches like Seri Nala. The rock lessons in the Rohtang Tunnel are primarily based on the NGI ‘Q’ technique, which is an empirical system and does not take into thing to consider proper geomechanical modelling of the rock. The willpower of the ‘Q’ price alone is conjectural and could vary from geologist to geologist. This makes the process of rock course dedication hard and contentious on internet site. Atal tunnel to Ladakh based on floor conduct demands to be adopted.