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No failure by the city government was to blame for last June’s massive sinkhole on Rideau Street, city solicitor Rick O’Connor reported Thursday, but experts aren’t sure why it happened and the public can’t see their report.
The sinkhole was “a complex event,” O’Connor wrote in a memo to city council. And right after it happened, contractors began pouring 3,000 cubic metres of concrete into the pit by the Rideau Centre just east of Sussex Drive, which made investigating the cause challenging.
“In light of these circumstances, the city’s external technical experts were unable to pinpoint a singular cause of the event, but are confident, based on their analysis of all the available evidence, that the sinkhole was not precipitated by a failure of city infrastructure,” O’Connor wrote.
Sinkholes are often caused by leaky pipes: Water trickles out and gradually washes away soil and rocks underground until what’s left isn’t strong enough to support whatever’s on the surface and it collapses.
In the case of Rideau Street, the sinkhole opened at about 10:30 a.m. on June 8 and grew fast, eventually spanning the full width of the road and eating a minivan. Crews working for the Rideau Transit Group, the consortium building Ottawa’s new-light rail line, were tunnelling underneath and working on a deep shaft nearby that’ll be an entrance to an underground station.
Broken pipes stuck out of the sides of the sinkhole; one spewed water into the pit until the city cut off the supply. It wasn’t clear at the time whether a pipe break caused the sinkhole or the sinkhole broke the pipe.
More to come.
查看原文...
The sinkhole was “a complex event,” O’Connor wrote in a memo to city council. And right after it happened, contractors began pouring 3,000 cubic metres of concrete into the pit by the Rideau Centre just east of Sussex Drive, which made investigating the cause challenging.
“In light of these circumstances, the city’s external technical experts were unable to pinpoint a singular cause of the event, but are confident, based on their analysis of all the available evidence, that the sinkhole was not precipitated by a failure of city infrastructure,” O’Connor wrote.
Sinkholes are often caused by leaky pipes: Water trickles out and gradually washes away soil and rocks underground until what’s left isn’t strong enough to support whatever’s on the surface and it collapses.
In the case of Rideau Street, the sinkhole opened at about 10:30 a.m. on June 8 and grew fast, eventually spanning the full width of the road and eating a minivan. Crews working for the Rideau Transit Group, the consortium building Ottawa’s new-light rail line, were tunnelling underneath and working on a deep shaft nearby that’ll be an entrance to an underground station.
Broken pipes stuck out of the sides of the sinkhole; one spewed water into the pit until the city cut off the supply. It wasn’t clear at the time whether a pipe break caused the sinkhole or the sinkhole broke the pipe.
More to come.
查看原文...
