Delhi Metro completes tunnelling work on Phase 4 of Golden Line project

The Delhi Metro Rail Corporation (DMRC) has successfully completed tunnelling work on Phase 4 of the Golden Line project, connecting Kishangarh and Vasant Kunj stations as part of the Tughlakabad-Aerocity corridor.

A tunnel boring machine (TBM) made its final breakthrough at the Vasant Kunj station site in the presence of Union Minister of Housing and Urban Affairs and Power, Manohar Lal Khattar, along with Minister of State for Housing and Urban Affairs, Tokhan Sahu.

Spanning 91 metres in length, the TBM excavated a 1,550-metre tunnel at Vasant Kunj station. The corridor will feature two parallel circular tunnels to facilitate up and down train movement. The second tunnel is expected to be completed by June, according to a DMRC statement.

The newly constructed tunnel, located at an average depth of 23 metres, comprises 1,107 tunnel rings, each with an inner diameter of 5.8 metres. The excavation was carried out using the earth pressure balancing method, a widely adopted tunnelling technique.

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To reinforce the structure, the tunnel walls have been lined with precast concrete rings manufactured at a mechanised facility in Mundka. These concrete segments were treated with a steam curing system to enhance durability and achieve early strength.

As part of Delhi Metro’s Phase 4 expansion, DMRC is constructing 40.109 km of underground metro lines, with the Tughlakabad-Aerocity corridor alone accounting for 19.343 km of underground sections.

(With inputs from PTI)