L&T’s TBM Records Breakthrough for Tungareshwar Tunnel Project
While metro rail and road tunneling projects continue to be my site’s main focus, I always get excited when tunneling milestones are recorded for other basic, important and “invisible” infrastructure components like sewage, hydro-electric and water supply projects.
Last week, Larsen & Toubro (L&T) completed tunneling activities for a 4.6 km tunnel under Tungareshwar Wildlife Sanctuary as part of the Surya Water Supply Project in Maharashtra’s Vasai region.
This project by Mumbai Metropolitan Region Development Authority (MMRDA) will allow water to be channeled to the Chene Master Balancing Reservoir to provide an additional 218 million litres daily water to the Mira Bhayander Municipal Corporation (BMMC) and 185 million litres daily water to the Vasai Virar City Municipal Corporation (VVCMC).
L&T was awarded the project’s Rs. 1329.01 crore contract for construction, operation and maintenance in August 2017 with a 34 month deadline. They are being assisted by Shah Technical Consultants as the project’s consultant.
L&T’s tunneling crew in 2021 commissioned a small Herreknecht tunnel boring machine (TBM) for this assignment at a depth of 55 metres to ensure minimal disruption to the sanctuary. The tunnel has an internal finished diameter of 2.85 meters.
Per Free Press Journal, the construction phase posed formidable challenges, particularly with the creation of a 55-meter-deep inlet shaft, where the rock conditions were exceptionally hard. To overcome this, the drill blast method was employed.
The geological conditions in this region displayed a remarkable variation, transitioning from the formidable basalt rock to the more manageable murram.
MMRDA’s Surya Water Supply Project page lists out all pieces of this project, which includes Kawadas pick-up weir (from where raw water will be lifted) to the new water treatment plant coming up in Suryanagar, and more.
The Central Government’s Environment Clearance website includes more finer details, including grainy maps of the project.
The entire project includes the construction of 4 tunnels. The other ones are:
- Mendhwan Khind Tunnel (crossing below NH-48) – 1.7 km, completed
- Vasai Creek Tunnel – 0.9 km, status unknown to me
- Kaman Creek Tunnel – 0.25 km, likely completed
Here’s a cool video of the project in Marathi with graphics straight out of the 90s. Tungareshwar tunnel’s depiction starts at the 2:50 mark.
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– TMRG
The design consultants for the TBM tunnel Segmental lining including Shafts and geotechnical investigations were AECOM India, This is the first unique detailed design including a high-pressure tunnel with segmental lining.
Good to know!
This is an interesting project to say the least, and the cost is sure high for a water project. Any idea who’s funding it?
I couldn’t locate any loan information, so inclined to believe it’s the state government
Very interesting description of tunneling for water transport for those engaged in water dynamics. It is not known whether the water flow is gravity based or pump driven. This decides the tunnel material which need to be designed for pressure
Pump driven. Environment Clearance website has more details.
I am chandan kumar pal Tunal electrician. Very nice L&T Tunal Water Project.
Goodwatettunnel worked of l. And t. In Mira new Mumbai.