The total length of the underground corridors in the proposed Phase-III will be almost equivalent to the total underground sections built so far by DMRC in Phase I and II.
Over 40 km of Delhi Metro's ambitious Phase-III 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 the proposed Phase-III will be almost equivalent to the total underground sections built so far by DMRC in Phase I and II.
"This makes construction of the Phase-III more challenging," a DMRC spokesperson said. Delhi Metro now has a total of 31 underground stations, while Phase 3 alone will have 28 underground stations.
"The total length of the underground corridor now is 48.06 kilometres and Phase 3 alone will have underground corridors of 41.044 kilometres," the spokesperson said.
The decision to construct more underground corridors was taken this time to ensure that construction work causes minimum inconvenience to the people.
By constructing so many underground stretches, DMRC will also be able to avoid causing any damage to the existing infrastructure such as flyovers and roads, the spokesperson said.
For the first time, three different tunneling stretches in Phase 3 will pass below existing underground Metro stretches in the city.
They are the underground stretch from Sarojini Nagar to INA on the Mukundpur Yamuna Vihar corridor, Indira Gandhi Domestic Airport to Kalkaji on the Janak Puri West and Mandi House to ITO.
The longest underground section of Phase 3 will be from IGI Airport (Domestic) to Kalkaji on the Janakpuri West Kalindi Kunj corridor which will be 17.288 kilometres long.
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, the spokesperson said.
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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