What correlations can be made from final blow counts for driven piles?
What correlations can be made from final blow counts for driven piles?
(OP)
I've seen where geotechnical engineers set minimum final blow count criteria, as if it is an indicator of final capacity. How are these determinations made?
What if you get great driving resistance at the start but finish with lower resistance?
Are there any good introductory papers on this topic?
What if you get great driving resistance at the start but finish with lower resistance?
Are there any good introductory papers on this topic?





RE: What correlations can be made from final blow counts for driven piles?
The subject is treated extensively in the literature. As for textbooks, any of the classic geotechnical texts (Terzashi, Sowers, etc.)cover the subject.
There has also been recent discussion here in the forums.
RE: What correlations can be made from final blow counts for driven piles?
Also, if a WEAP analysis is done relating the soil, pile, hamer, etc. a capacity versus blows per foot curve can be determined.
When we design piles to be driven to refusal, we always indicate a required number of blows per final inch and/or foot to be met.
Mike Lambert
RE: What correlations can be made from final blow counts for driven piles?
M.A.