That picture way above shows how the Caisson shoring works when they start digging. It looks like they excavate to show the rounded pour and then I believe the excavator scoop will simply carve the mortar mix to even out the shoring. I assume the concrete mix is probably a weaker strength to allow this.
The geology seen in the excavation is kinda cool. Correct me if I am wrong, but it seems as if downtown Calgary is on a giant bed of Glacial till with no sign of bedrock at all.
We just get frost quakes, so nothing too crazy hopefully in the ground under our downtown. I think the bedrock is still deeper than the excavations of most pits.
Maybe I was thinking of Regina? But I thought we had a discussion that Calgary's downtown bedrock was over 100 meters down? It would make sense that it is close to the surface though, as the bluffs and the Paskapoo Escarpment have exposed bedrock so close to downtown.
Why the need for raft slabs if bedrock is that close? Or, is the bedrock too soft to anchor towers?
Bedrock is close as 25 feet down. Downtown Calgary is mostly gravel as it was a glacial lake bed. The bigger issue is horizontal sheer as the bedrock is unstable.
It wasn't the entire site that was contaminated, it was just the basement/foundations of an old long-demolished hotel in the Northwestern corner of the site that required remediation.
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