Chennai Metro Rail set to bore beneath existing tunnel in Nandanam
Chennai Metro Rail is currently boring a new tunnel for the phase II network directly beneath an existing phase I tunnel in Nandanam. Engineers are monitoring vibrations in real-time to ensure the structural integrity of the operational line remains intact.
Why it matters
This complex engineering feat allows for the expansion of urban transit infrastructure without disrupting existing public transportation services.
In a couple of days, as you travel in Chennai Metro Rail trains through the tunnel of the phase I network at Nandanam, a mammoth tunnel boring machine (TBM) would be quietly crawling underneath, creating another tunnel in which commuters will travel in future.
In the 118.9-km phase II network, the corridor 4 from Poonamallee to Light House will criss-cross the phase I network’s tunnel at Nandanam. As a part of this corridor has been designed as an underground network from Kodambakkam to Light House, Chennai Metro Rail has been building tunnels in short sections.
So far, two tunnel stretches — Light House to Thirumayilai and Panagal Park to Kodambakkam — have been completed. In December last year, Chennai Metro Rail commenced tunnelling from Panagal Park yet again to bore towards Boat Club via Nandanam.
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