AlvinofDiaspar
Moderator
Spacing article on this issue
http://spacing.ca/toronto/2014/10/03/torontos-swelling-bedrock/
Incidentally the article have mentioned one possible reason why the garage isn't any deeper, and some possible mitigations:
AoD
http://spacing.ca/toronto/2014/10/03/torontos-swelling-bedrock/
Incidentally the article have mentioned one possible reason why the garage isn't any deeper, and some possible mitigations:
There are a number of different approaches used to mitigate the effects of squeezing rock. You can limit excavation depths to the top of the troublesome rock, approximately 10 m deep along the downtown waterfront. You can excavate the rock, wait for it to squeeze/swell, and then build your structure. You can build your structure to take the squeezing loads, meaning thick walls with extra steel reinforcement. You can surround the structures by foam like materials that compress as the rock presses in. If appropriate construction techniques are used, the negative impacts of our quirky rock are avoided.
AoD
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