I have not done this in a while and forgot what my old firm did when we detail this. The geotech recommends 10" minimum diameter with 30:1 length to diameter ratio. I think all of the piers will end up being 10" diameter. Some may end up being 12" if I have to go deeper than 25 ft. What ties do I use? #3 @ 10" o.c.? I want to specify what people typically use. Most of these piers will be in compression. Some will be in tension at the end of the counterfort. This is for foundation in expansive soil.
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