Quote:
Originally Posted by jollyburger
If you had no parking under a 64 floor tower how deep would you still need to make the foundation?
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You mean no 'below grade' parking, right?
You would still need parking obviously, and if you can't put it underground it would likely go in the podium as they do in Richmond.
Regardless, you're asking about a situation in which you can't excavate (too deep) for various reasons (high water table, no bedrock to anchor, unstable silt/sand conditions).
It would still depend on a whole bunch of other factors.
In the case of the high water table or a presence of an underground aquifer, for example, it would be a case of tanking the foundation which requires a deeper than normal base slab (but still not several floors deep).
In other cases you're not so much worried about the high water table, but you still can't excavate too deep - like in the case of unstable silt or sand conditions - simply because there's nothing to anchor the building to. And in those situations you're probably piling all the way down to try to get to bedrock to anchor the building as it sits on piles - to prevent uneven settling (and possible tilting) in the future.
I guess all of which is to say, it depends on the specific situation and conditions preventing you from having below grade or subterranean excavation and construction
In most of these cases you're likely not going to go more than a few floors deep below grade, but your base slab will probably be very thick.
Check out how thick the base slab of the Oakridge project (which sits above an active aquifer, and despite which they're still excavating and going deep) is, on the Oakridge thread.
I believe some sections are 4 METERS thick of solid reinforced steel concrete.
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