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GEO5

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Pile Group

Analysis of a group of piles depends on the structure stiffness. The basic assumption is that for a stiff structure all piles experience the same settlement, while for a compliant structure each pile deforms independently - no interaction is assumed.

The maximum bearing capacity of a rigid pile foundation is given by:

where:

M

-

number of piles in the pile foundation

Fr,max,rep

-

single pile bearing capacity in the pile foundation

If adopting the NEN6743 standard then a coefficient of capacity reduction ξ is introduced into the analysis depending on the number piles M and the number of CPTs (article 5.3.2.1). The maximum bearing capacity of a compliant pile foundation is determined according to the bearing capacity of the most stressed pile in the group as:

where:

Fr,i

-

bearing capacity of pile in the group