The most commonly used formula to determine the allowable static load on a pile is the Engineering News formula.
Case-1 The allowable load for piles driven by a drop hammer
Pa=(2WH)/(p+1)
Case-2 The allowable load for piles driven by a steam hammer
Pa=(2WH)/(p+0.1)
where
Pa=allowable pile load, tons (kg)
W= weight of hammer, tons (kg)
H= height of drop, ft (m)
p= penetration of pile per blow, in (mm)
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