[RailTransportation] SINKHOLES : TRANSPORTATION: SUBWAYS : COUNTRIES: CANADA : CITIES: OTTAWA: Engineers to Assess Damage to LRT Tunnel at Rideau after Giant Sinkhole

 

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SINKHOLES : TRANSPORTATION:

SUBWAYS :

COUNTRIES: CANADA :

CITIES: OTTAWA:

Engineers to Assess Damage to LRT Tunnel at Rideau after Giant Sinkhole

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Engineers to Assess Damage to LRT Tunnel at Rideau after Giant Sinkhole

Tunnel may be flooded and damage could cause up to a month delay on light rail work

By Amanda Pfeffer

CBC News

June 10, 2016 7:27 AM ET Last Updated:

June 10, 2016 11:23 AM ET

http://www.cbc.ca/news/canada/ottawa/ lrt-tunnel-work-stalled-repairs-sinkhole-1.3628083

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A shorter URL for the above link:

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http://tinyurl.com/hbr962r

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All eyes have been fixated on the damage caused by the giant sinkhole that swallowed up a section of Rideau Street in downtown Ottawa, but about five storeys below it, the light rail tunnel that’s under construction may have been flooded, according to the consortium responsible for building the future Confederation Line.

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Engineers for the Rideau Transit Group (RTG) are heading down into the tunnel Friday to assess the damage for the first time since workers were told to drop their tools and leave the site in the minutes after the street above the tunnel fell away, creating a sinkhole five metres deep.

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Peter Lauch, RTG’s technical manager, said there’s water in the tunnel but the extent of the damage is not known.

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“Our engineers haven’t had a chance to get in there and assess if it’s a puncture or if it’s a fissure or if it’s a small hole or a large hole; they’ve not been able to determine that yet,” Lauch said.

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Also to be determined is the cause of the sinkhole.

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RTG could be liable for costs

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If work done for the LRT project ultimately caused the sinkhole, then RTG is liable to pay for the damage because of the nature of its public-private partnership (or P3) agreement with the city.

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Ottawa Mayor Jim Watson said Thursday that this time it may take months to determine what caused the sinkhole.

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“It took us about a month to do the Waller Street [sinkhole investigation] and this one is obviously substantially bigger,” he said.

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LRT tunneling almost complete

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RTG had been digging the 2.5-kilometre light rail tunnel from two ends, with both machines simultaneously moving toward each other.

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When the sinkhole opened up the tunnel was almost complete, with the two ends now just 50 metres apart.

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The westbound tunnel had made it to the future Rideau Station, which is also under construction but was not damaged by the sinkhole, according to Lauch.

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The complete article may be read at the URL above.

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