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 Conversely, if the required Hiley set is achieved
at a higher elevation, an attempt will be made to
drive the pile further, where possible without
damaging the pile, until the minimum required
penetration has been achieved.

 Where it is not possible to drive the pile further,
the pile capacity should be taken as the smaller
of that calculated from the pile driving formula
and that from at least one 'static' method.

 If a driven pile is designed on the basis of a
'static' calculation without being driven to set, it
is advisable that the design be confirmed by
static load test.

PILE CAPACITY

2- From Pile Driving Formula

Engineering New Formula (F.S. = 6):

Qall  1000 Wr .H

6 S  C

Where: 26

Qall = Allowable pile capacity, (kN);
Wr = Weight of hammer, kN;
H = Height of hammer fall, m;

S = Amount of pile penetration/blow, (mm);

C = Constant = 25 for drop hammer

= 2.50 for steam hammer.

17 August 2021

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