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For the Discussion Forum, I suggest an important question of the application of High Strain Dynamic Pile Testing (HSDPT). Does dynamic testing determine or predict the pile capacity?
Dynamic testing is used for a capacity prediction without prior knowledge of the static loading test. This is an incorrect and misleading interpretation of HSDPT which does not have any connection with Class A type prediction defined by Lambe (1973). No in-situ pile test (static, dynamic, statnamic, Q-cell, whatever test) can predict pile capacity as a function of time after pile installation. Only static analysis and wave equation analysis without pile testing are truly predictive methods. HSDPT, as any other in-situ tests, yields pile capacity only at the time of testing.
Unfortunately, in some publications pile capacities obtained from HSDPT are considered as predicted values. As a matter of fact the authors made wrong interpretation of pile testing results. If database is wrong, how is it possible to prove the research results?
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Subject:
Determination or prediction of pile capacity by HSDPT 
