Looking for a ratio of internal vs external frictional capacity of driven pipe piles in a layered sand and clay. FHWA's Driven Pile Foundations has a blurb recommending 1/3 to 1/2 of the external capacity when a plug is not formed.
We are in the process of designing a crane footing (10ft. square)on controlled fill (20 ft of fill with footing embedment of 5 to 10ft). My primary concern is settlement since the applied loads are in the range of 2 tsf and bearing should not be an issue. I ran an analysis assuming a sandy soil...
