Building of 21-km tunnel in Mumbai-Ahmedabad Bullet Practice Mission expedited
The development actions associated to 21 km lengthy tunnel from Mumbai Bullet Practice station to Shilphata within the state of Maharashtra is progressing at a quick tempo, NHSRCL officers mentioned.
| Photograph Credit score: Particular Association
To be able to expedite the development of 21 km lengthy tunnel between Bandra Kurla Advanced and Shilphata, the Nationwide Excessive Velocity Rail Company Restricted (NHSRCL) has excavated the 394 metre lengthy Moreover Pushed Intermediate Tunnel (ADIT) at Ghansoli, for Mumbai-Ahmedabad Bullet Practice Mission.
The ADIT will give direct vehicular entry to the principle tunnel throughout building and operations, and may additionally be used for the aim of evacuation course of in emergency state of affairs.
The excavation work for ADIT, which began on December 6 2023, took six months to complete and included 214 managed blasts utilizing 27,515 kg explosives beneath supervision of consultants with a excessive degree of instrumentation.
Excavation of ADIT, which is a 26-metre-deep inclined tunnel will pave approach for onwards building of one other 3.3 km tunnel via New Austrian Tunnelling Methodology (NATM), by permitting simultaneous entry for tunnelling roughly 1.6 metre on all sides.
Out of 21 km of tunnelling work, 16 km is thru Tunnel Boring Machines and remaining 5 km is thru NATM.
The development actions associated to 21 km lengthy tunnel from Mumbai Bullet Practice station to Shilphata in Maharashtra is progressing at a quick tempo, NHSRCL officers mentioned. “The 7 km stretch of this tunnel can be beneath the ocean at Thane Creek which is an intertidal zone. That is the primary of its form tunnel to come back up within the nation,” officers added.
The 21 km lengthy tunnel can be a single tube tunnel to accommodate two tracks meant for up and down tracks of the bullet practice. To assemble this tunnel, Tunnel Boring Machines (TBMs) with cutter heads of 13.6 metre diametre can be used.
NHSRCL has focused to finish bullet practice venture by 2028. The practice is pegged to scale back journey time between Mumbai to Ahmedabad to three hours.
The beneath building three shafts at BKC, Vikhroli, and Sawli will facilitate the development of 16 km lengthy tunnel via Tunnel Boring Machines.
