The base resistance of pile in drained soil can be determined using the method of calculating bearing capacity of shallow foundation under the same condition.
The only
difference is, the pile is usually deeply embedded and at the founding plane,
the overburden soil surcharge is huge. This causes the cohesion and self-weight
terms become much smaller than surcharge terms. As a result, their contribution
is negligible and the calculation for pile base resistance may be simplified.
The bearing
capacity factor Nq should be determined using the chart provided by Berezantsev
et al (1961) when circular pile is used.
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