The 'load bearing capacity' of a pile from dynamic formulae (Engineering News Formula) gives:
Choose the correct answer
Only settlement of piles
Rough estimate of safe pile capacity from driving records (ram weight, drop, set per blow) — now superseded by PDA
Exact long-term pile capacity
Pile skin friction only
Correct Answer
B. Rough estimate of safe pile capacity from driving records (ram weight, drop, set per blow) — now superseded by PDA
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Engineering News (EN) Formula: Q_safe = (WH)/(S+C) / FOS where W = ram weight, H = drop, S = set (mm/blow), C = constant (25 mm for drop hammer). FOS = 6 (traditionally). Gives rough estimate of pile capacity from driving records. Now replaced by dynamic load tests (PDA = pile driving analyzer) which is much more reliable. EN formula often over-predicts in clay.
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