Chennai Metro Phase 2 Expansion – Projects Insights

Chennai Metro Rail Limited has commenced the expansion of the Chennai city’s metro rail network as a part of Phase-II after the successful completion of the Phase-I and Phase-I Extension Corridors in stages since June 2015 and the growing ridership in Corridors 1 & 2.

More Details:

  • Now, CMRL has ventured into an extensive infrastructure development in the city comprising 3 more corridors of metro rail for a total length of 118.9 km & 128 nos of stations being funded by several multi-national funding agencies including the JICA, ADB and AIIB.

The Salient & Unique features of Phase-II:

Elevated Section:

  • CMRL will have a Double decker line & station standing in a single pillar for a stretch of about 5 km. The double-decker stretch will have four stations developed at two levels, Alwarthirunagar, Valasaravakkam, Karambakkam and Alapakkam, and there will be a common concourse (ticketing level) with two different platforms. To execute the same, a special Launching Girder is fabricated and ready for use.
  • Many Balanced Cantilever method spans are adopted as special spans to suit the site conditions. Out of all, the challenging location is Kathipara Junction. 5 span continuous BCM (1 x 58m + 3 x 100m + 1 x 95m) with 125 m radius curve.
  • Integrating with the State Highway flyover at Thoraipakkam, Sholinganallur, Kattupakkam, Majambakkam & MIOT flyover location.

Underground Section:

  • Stacked station: CMRL has planned to go with underground stations with a stacked-up platform design at locations where the width of the roads is as narrow as 10m. Pattalam, Thirumayilai, Kutchery, Alwarpet, Bhardhidhasan road stations are with staked tunnels.
  • Intersection of Tunnel: At Kilpauk, Thousand light and Nandanam, Phase II tunnels are passing below the Phase I running tunnels. More challenging to execute the same.
  • Crossing of Adyar River: Corridor 3 crosses Adyar River near Adyar Junction (UG). The Crown of the Tunnel is 7 m below the bed level.
  • As part of Multi-Modal Integration, the Phase-II Network will be integrated with other public transport modes namely Suburban Rail, MRTS, City Bus Service, etc. at 21 different locations to ensure hassle-free and seamless connectivity.

Source: Chennai Metro- Press Release | Image Credit (representational): CMRL