Mumbai’s coastal road project: BMC completes 330 m of tunnelling work
The Brihanmumbai Municipal Corporation (BMC) has finished 330 metres of tunnelling work of the underwater twin tunnels which connect the 9.98 km Princess Street Flyover with Worli, an important part of the Mumbai coastal road project.
BMC completed the first 100 m of the tunnelling in the first week of March. The overall tunnelling work is expected to take 18 months, and the municipal body has set a deadline of June 2022 to complete the work. The two tube twin tunnels will start below Girgaum Chowpatty and come out at Priyadarshini park.
According to BMC officials, the twin tunnels are being constructed using the cut-the-cover construction method, wherein the actual tunnel would be only 1.9 km, but after including the entire entry and exit portions, its length would run up to 3.4 km.
BMC told the media that for the first time, a single-pillar technology will be used. This process of building three test columns has started on the beach near Worli, and further construction of these columns is expected to be completed by the end of July.
Civic officials informed the media that the coastal road is being developed on 176 single pillars using a mono-pile system, where a single solid column is constructed from bottom to top, instead of a group pile, wherein there are four pillars under each.