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394-meter-long ADIT Completes for Bullet Train Project

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394-meter-long ADIT Completes for Bullet Train Project
Excavating has begun on the 394-meter Additionally Driven Intermediate Tunnel (ADIT) at Ghansoli for the Mumbai-Ahmedabad Bullet Train Project.

Excavation has begun on the 394-meter Additionally Driven Intermediate Tunnel (ADIT) at Ghansoli for the Mumbai-Ahmedabad Bullet Train Project. This would hasten the construction of a 21-kilometer tunnel in Maharashtra that will connect BKC and Shilphata. The New Austrian Tunnelling Method (NATM) will make the building of the 3.3 km (about) tunnel easier thanks to the inclined 26-meter ADIT, which will give simultaneous access for tunnelling 1.6 metres (approximately) on either side. Of the 21 km of tunnelling operations, 16 km are completed with tunnel boring machines, and the final 5 km are completed by NATM.

Beginning on December 6, 2023, the excavation project for ADIT was completed in about six months, excavating the full 394 metres. Under the guidance of specialists, 214 controlled bursts weighing 27,515 kg of explosives were carried out. To guarantee safe excavation, advanced instrumentation was employed.

During construction and operations, the 11-meter-by-6.4-meter ADIT’s internal dimensions will provide direct vehicular access to the main tunnel. It can also be used for emergency evacuation procedures.

To guarantee the safe excavation of the tunnel and all the neighbouring structures, several monitoring devices are being deployed. The following tools are being used for the work: BRT (By reflect target/3D targets), Seismograph for Peak Particle Velocity (PPV) or vibration & seismic wave monitor; SSP (Surface Settlement Points); ODS (Optical displacement Sensor) or tilt metre for displacement in both axis; and strain gauge for micro strains in tunnel surface. The 21-kilometer (about) tunnel that will connect the Mumbai Bullet Train station to Shilphata in the state of Maharashtra is now undergoing rapid development. This tunnel’s 7 km (about) undersea section will be located in Thane Creek (intertidal zone). This is the initial instance of its kind tunnel to emerge in the nation.

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The 21 kilometre tunnel will have a single tube for two tracks—one for downhill travel and the other for upward travel. Tunnel Boring Machines (TBMs) with cutter heads that have a diameter of 13.6 metres will be utilised to build this tunnel. Since urban tunnels utilised in the MRTS Metro system can only support one track, cutter heads with a diameter of 6 to 8 metres are typically employed in these tunnels.

The three shafts that are now under development at BKC, Vikhroli, and Sawli will make it easier to use TBMs to create a 16 km long tunnel.

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