I was called onto a project with no geotechnical engineer or exploration. The project is a one-story wood frame restaurant built on a pond in up to 15 feet of water. The contractor jetted 40 foot timber piles and then got nervous and called for an exploration, which was completed last week, and wants an estimate of pile capacity for piles already placed. I can't find anything on the capacity of a jetted pile. Any way to proceed would be helpful in determining the capacity of piles which have already been placed. The only thing I can think of is hammer striking and PDA, but there is a soft clay layer about 2 to 5 feet below the pile tip and the hammer striking might keep going until the pile is under water. There might be no real capacity at all.
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