Building Construction
Engineering news formula for obtaining safe bearing capacity of pile for drop hammer, is,

Q = Wh/2.5 (S + 6)
Q = Wh/6 (S + 2.5)
Q = (W × 2.5)/6 (S + h)
Q = (W × 6)/h (S + 2.5)

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Building Construction
Negative skin friction

Both (A) and (B)
Develops due to lowering of ground water
Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile
Neither (A) not (B)

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