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| POWER AND TAILRACE TUNNELS | ||
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POWER TUNNEL FOR CHAMERA HYDRO-ELECTRIC PROJECT, INDIA 9.5 metre finished diameter horse shoe shaped Power Tunnel including large scale drilling, blasting and excavation in rocks, concrete lining, cement and sand grouting, steel supports and anchor bolting at Chamera, Himachal Pradesh, India. |
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-9.5 M dia, 3700 M.long -404,000 cum -1,000 MT -50,000 cum -121,000 M -8,000 cum -Hydro Power Generation (540 MW) -National Hydroelectric Power Corporation Ltd., India |
 Inside view of Headrace Tunnel showing steel supports with wooden lagging |
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Driving of 760 M length 10.50 M excavated diameter Headrace
Tunnel, from one face was achieved in a short span of six months. This
is the maximum sustained rate of progress in tunnelling down by any agency
in the Himalayas, so far. A record length of 48 metres of tunnel was driven
in a matter of 7 days .
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 Rockbolting in progress |
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TAILRACE TUNNEL FOR CHAMERA HYDRO-ELECTRIC
PROJECT, INDIA
9.5 metre finished diameter horse shoe shaped Tailrace Tunnel including large scale drilling, blasting and excavation in rocks, concrete lining, cement and sand grouting, steel supports and anchor bolting at Chamera, Himachal Pradesh, India. |
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-9.5 M dia, 2650 M.long -100,000 cum -247,000 cum -61,500 cum -30,000 cum -99,000 M -8,500 cum -Hydro Power Generation (540 MW) -National Hydroelectric Power Corporation Ltd., India -1985- |
Drilling by Track Drill |
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The work of construction of tunnels at Chamera is fully
mechanised using the latest tunnelling equipment including hydraulic drilling
and rock bolting jumbos, low profile hydraulic dumpers, shotcreting machines
with robot booms etc. The tunnels are being driven in most difficult geological
conditions in an area of reverse faulting and thrusts typical of the Himalayan
foothills.
A milestone of the Project was the Tail Race Tunnel crossing a major river Ravi, 40 M below its bed. This is the largest under-river tunnel crossing anywhere in the Himalayas. |
 View of Open Channel and Outlet Portal of Tailrace Tunnel |
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