Hiley’s
formula is adopted for design of almost 90% of
the H-piles . However, this formula is only
applicable to pile lengths less than 30m and is suitable only
for coarse-grained
materials (& not suitable for
fine
grained
soils) as suggested
by GEO (1996).
Hiley’s formula
employs a dynamic method wherein
by observing the penetration of piles
resulting from hammer impact, the pile capacity
can be readily determined . Therefore, the
individual pile capacity can be
obtained by using this method.
However, in
normal foundation, groups of H-piles are present and the soil foundation may
not be able to support these H-piles simultaneously even though
individual
piles are proven to have sufficient capacity by using dynamic
method.
In such
cases, static method should be employed to ascertain if the soil
foundation
could support these H-piles.
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