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Mumbai-Ahmedabad bullet train work records first major breakthrough: 2.7 km tunnel completed

Mumbai-Ahmedabad bullet train work records first major breakthrough: 2.7 km tunnel completed

Hindustan Times3 days ago
The first breakthrough in the 21-km tunnel being constructed between Bandra-Kurla Complex (BKC) in Mumbai and Shilphata in Thane for the Mumbai-Ahmedabad bullet train project has been achieved, the National High Speed Rail Corporation Limited (NHSRCL) said on Thursday. This achievement marks a significant leap forward in India's first bullet train project.(@RailMinIndia)
The first breakthrough in the 21 km long tunnel was recorded on Wednesday, an NHSRCL release informed.
With this, a 2.7 kilometre continuous tunnel section has been successfully completed using the New Austrian Tunnelling Method (NATM), the release added.
This achievement marks a significant leap forward in India's first bullet train project, aimed at connecting Mumbai and Ahmedabad with a high-speed rail corridor, drastically reducing travel time and enhancing transport efficiency between the two financial hubs, it said.
"The 21-kilometre tunnel will be a key part of the high-speed rail corridor, with 16 km being constructed using Tunnel Boring Machines (TBMs), and the remaining 5 km through the New Austrian Tunnelling Method (NATM), especially between Shilphata and Ghansoli. Significantly, the tunnel also features a 7 km undersea section beneath Thane Creek," it said.
"To expedite tunnelling in the NATM portion, an Additionally Driven Intermediate Tunnel (ADIT) was constructed, which enabled simultaneous excavation from both Ghansoli and Shilphata ends. Of the total NATM section, approximately 1.62 km has been excavated from the Shilphata side, and the cumulative progress stands at 4.3 km," the release informed.
Comprehensive safety measures have been implemented at the site, including installation of ground settlement markers, piezometers, inclinometers, strain gauges, and biometric access control systems, the NHSRCL said.
These are designed to ensure safe and controlled tunnelling operations without impacting nearby infrastructure or habitats, it added.
Sources, however, said TBMs are yet to be received from companies for the construction of the 16-km-long tunnel, though shafts and other equipment to launch these machines are in place. The total cost of the Mumbai-Ahmedabad High Speed Rail Corridor project is pegged at ₹1.08 lakh crore.
As per the shareholding pattern, the Union government is to pay ₹10,000 crore to the NHSRCL, while Gujarat and Maharashtra are to pay ₹5,000 crore each.
The rest is to be paid by Japan through a loan at 0.1 per cent interest.
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(File) New Delhi: There is more good news about the much-awaited Mumbai-Ahmedabad bullet train project. The ambitious mission has achieved its first important milestone as a 21-km-long tunnel between Mumbai's Bandra-Kurla Complex (BKC) and Thane's Shilphata has been constructed. Which method has been used? A 2.7-km-long continuous tunnel section has been successfully completed using the New Austrian Tunneling Method (NATM). The National High Speed Rail Corporation Limited (NSSRCL) has given this information. This achievement is a significant leap in India's first bullet train project, which aims to connect Mumbai and Ahmedabad through a high-speed rail corridor. This will significantly reduce travel time and increase transport efficiency between the two financial centers. The 21-km long tunnel will be a crucial part of the high-speed rail corridor, of which 16 km will be constructed using tunnel boring machines (TBMs) and the remaining five km using the New Austrian Tunnelling Method (NATM), including the section between Shilphata and Ghansoli. What else does the tunnel include? The tunnel also includes a seven-km undersea section under the Thane creek. To expedite the tunnelling work in the NATM section, an additional operated intermediate tunnel (ADIT) was constructed, enabling simultaneous excavation from both Ghansoli and Shilphata ends. Out of the total NATM section, about 1.62 km has been excavated from the Shilphata side and the total progress is 4.3 km. What is the cost of this project? The NHSRCL said that extensive safety measures have been implemented at the site, including installation of ground settlement markers, piezometers, inclinometers, strain gauges and biometric access control systems. These are designed to ensure safe and controlled tunnelling work without affecting nearby infrastructure or habitations. However, sources said that TBM machines have not yet been received from the companies for the construction of the 16-km-long tunnel, while the shafts and other equipment for these machines are in place. The total cost of the Mumbai-Ahmedabad High Speed Rail Corridor project has been estimated at Rs 1.08 lakh crore. As per the shareholding pattern, the central government will pay Rs 10,000 crore to NHSRCL, while Gujarat and Maharashtra have to pay Rs 5,000 crore each.

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