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News Entry# 287177
Nov 30 2016 (07:19)  Delhi Metro completes tunnelling for Phase 3 (
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Commentary/Human InterestDMRC/Delhi Metro  -  

News Entry# 287177     
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Posted by: rdb*^  133024 news posts
The Delhi Metro Rail Corporation (DMRC) has successfully wrapped up all tunnelling works of Phase 3 with the completion of a 1.25-kilometre-long tunnel between Vasant Vihar and Munirka on the Janakpuri West-Botanical Garden Magenta Line.
A DMRC spokesperson said the work on this tunnel, which has 904 rings and has been constructed about 20 metres below the surface, started in October 2015.
DMRC has completed one of the largest tunnelling projects in the world,” said the spokesperson.
“The quantum of underground work in Phase 3 can be gauged from the fact that in the last phase, only 35 km were underground and in Phase 1, the underground component was 13 km,” he added.
The tunnelling work on the 38-km-long Janakpuri West-Botanical Garden corridor had multiple engineering challenges, he said. The new tunnels passed below already operational elevated viaducts of the Delhi Metro at three locations (at Janakpuri West below Blue Line, near IGI Airport below Airport Line and near Kalkaji Mandir below Violet Line).
At Hauz Khas, the new tunnel also passed below the already operational tunnel of Yellow Line. “Construction of a 1.4-km-long tunnel between Shankar Vihar and Vasant Vihar on this section was also fraught with challenges as it passed below the rocky Aravallis, and special boring machines had to be pressed into service for the drive,” he said.
Of the 59 km between Majlis Park and Shiv Vihar on the Pink Line, about 19 km is underground. This is the longest corridor of the DMRC.
“On this section, the new tunnels passed below operational viaducts at three locations (at Azadpur below the Yellow Line, at Netaji Subhash Place below the Red Line and at Lajpat Nagar below the Violet Line). The new tunnel also passed below the operational tunnel of Yellow Line at INA,” the spokesperson said.
Delhi Metro’s longest tunnelling drive of 1.6 km from Ashram to Nizamuddin also falls on this section. All the tunnelling work on this line has also been completed.
However, at some locations, the TBMs are being retrieved following the completion of work.
The tunnelling work on both Magenta and Pink Lines had to face multiple challenges since these corridors mostly pass below the arterial Outer Ring Road and Ring Road of the city, which have heavy traffic, said the spokesperson.“For countering all these challenges, round-the-clock monitoring was done to ensure that there was no settlement of land anywhere or damages to the structures above,” he said.
Trial runs
The 9.37-km Central Secretariat – Kashmere Gate corridor is also entirely underground. While the section up to ITO has already been opened, trial runs on the remaining stretch up to Kashmere Gate are in progress.
“Tunnelling on this section was extremely difficult as well since almost the entire alignment is dotted with monuments of huge historic importance,” he said.
“Moreover, Old Delhi has many dilapidated buildings,” he added.
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