Rock @ 3'
Rock @ 3'
(OP)
I know this is a very stupid question but I am being bugged constantly by the architect to get an idea for estimate purposes of what the footing sizes would be for a 7 story structure. He keeps telling me to assume rock at 3' depth (river bed in the area). I know what to assume for regular footings for estimate sake, 2000-3000 psf. But the heck could I assume (which I would clearly state to the arch) for a rock at 3.





RE: Rock @ 3'
RE: Rock @ 3'
RE: Rock @ 3'
RE: Rock @ 3'
Mike McCann
MMC Engineering
RE: Rock @ 3'
Mike McCann
MMC Engineering
RE: Rock @ 3'
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Rock @ 3'
Dik
RE: Rock @ 3'
RE: Rock @ 3'
liquefaction potential(?) ----> unacceptable
settlement(?)----->excavation dewatering problems(?)
Assuming the bearing capacity to size the foundations is the least of your potential problems!
RE: Rock @ 3'
As others have mentioned, nothing can be assumed, and you will most definitely want an accurate geo site survey to produce an accurate estimate. A few undesirable characteristics and a low estimate could bite you by a factor of 10 or more. It's either that or go with a "shoot the moon" estimate.
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.