Phase 3 extension to have record number of underground corridors
Phase 3 extension to have record number of underground corridors
Delhi Metro is constructing a record number of underground corridors for Phase-3 extension. The longest tunnel of Phase 3 will be from IGI Airport (Domestic) to Kalkaji on the Janakpuri West-Kalindi Kunj corridor which will be 17.288 km long. 
Over 40km of Phase 3 will be built underground. Representative pic
Over 40 km of Delhi Metro's ambitious Phase 3 plan will be built underground and three different stretches will pass below existing underground Metro corridors, a decision taken to lessen the inconvenience caused to people during construction.
"The total length of the underground corridors in Delhi Metro's proposed Phase 3 will be almost equivalent to the total underground sections built so far by DMRC in both Phase 1 and 2, making it one of the most challenging construction phases for the organisation," said Anuj Dayal, spokesperson, Delhi Metro.
"While Delhi Metro now has a total of 31 underground stations, Phase 3 alone will have 28 underground metro stations. The total length of the underground corridor presently is 48.06 kilometres and Phase 3 alone will have underground corridors of 41.044 km," said Dayal.u00a0u00a0
The Mukundpur-Yamuna Vihar corridor will have underground lines of 14.386 kilometres and the Central Secretariat-Kashmere Gate corridor will have a total of 9.370 kilometres of underground lines. As per present plans, most of the underground work will be done through Tunnel Boring Machines (TBMs), New Austrian Tunneling Method (NATM) and stations will be constructed with the help of the cut-and-cover technology.
At present, initial tests such as geo-technical surveys, soil surveys, utility tests are being conducted by
specialised agencies on all the above mentioned corridors. Tenders have been finalised for the construction of the Mandi House and Janpath stations on the Central Secretariat-Kashmere Gate corridor.
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