The development work of a 394-meter-long moreover pushed intermediate tunnel (ADIT) was accomplished final week at Ghansoli for the Mumbai-Ahmedabad bullet practice challenge, Nationwide Excessive Pace Rail Company Restricted (NHSRCL) officers mentioned.
The ADIT tunnel is meant to provide construction workers and vehicles access to a degree from the place excavation works for the main-line’s tunnel can begin by the New Austrian Tunneling Technique (NATM).
The 26-meter-deep inclined ADIT will facilitate the development of the three.3-km tunnel section utilizing the NATM.
Of the 21 km of fundamental line’s tunnel, 16 km might be constructed utilizing Tunnel Boring Machines (TBMs), whereas the remaining 5 km will utilise NATM. Excavation for the ADIT started on December 6, 2023, and all the 394 meters was accomplished in six months.
A complete of 214 managed blasts, utilizing 27,515 kg of explosives below knowledgeable supervision, ensured secure excavation with high-level instrumentation, as per NHSRCL.
The development of the 21- km tunnel from the Mumbai Bullet Prepare station to Shilphata is presently on. A 7-km stretch of this tunnel will run below the ocean at Thane Creek (Intertidal zone), marking the primary such tunnel in India.
This single-tube tunnel will accommodate two tracks for each up and down trains.
TBM with cutter heads measuring 13.6 meters in diameter might be used for the tunnel building, bigger than the standard 6-8 meter diameter cutter heads used for city metro tunnels, which accommodate just one observe.