I'll check with a couple of local foundation contractors to see what info they have. The axial capacity of augercast piles is estimated using procedures similar to those described in the Drilled Shaft Manual by Reese and O'Neill. Again, the DFI has numerous publications that can be purchased off of their website that deal solely with augercast piles. Augercast piles have diameters typically ranging from 12 to 24 inches, but piles up to 36 inches in diameter have been constructed. Allowable compression capacities in Florida range from 50 tons on a 14-inch diameter pile, to 400 tons on a 24 inch diameter pile.
Piles work well in sands, firm clays, soft rocks.
Not good in peats, or soft cohesive soils where shaft may bulge. Piles generate high uplift capacity. Automated installation monitoring equipment is also available, but not universally used yet due to cost. The name by which you'll be known in the forums. Click Here to find out why.