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NEN 6743

The NEN 6743 "Piled Foundations" standard determines the maximum pressure at pile base pmax, base from the corresponding ith penetration test as follows:

kde:

qc, I, mean

-

mean of the cone tip resistance  qc, I (see article 5.3.3.3 in NEN 6743 standard)

qc, II, mean

-

mean of the minimum cone tip resistance  qc, II (see article 5.3.3.3 in NEN 6743 standard)

qc, III ,mean

-

mean of the cone tip resistance  qc, III (see article 5.3.3.3 in NEN 6743 standard)

αp

-

pile base coefficient

s

-

pile shape coefficient

β

-

expanded pile base coefficient

The maximum value of penetration pressure qc is limited by the value of 15 MPa. In cohesionless soils the analysis takes into account the influence of overconsolidation (OCR).

The maximum shaft friction pmax, shaft is given by:

where:

αs

-

shaft friction coefficient

qc, z, a

-

tip resistance at depth h

Literature:

NEN 6743:1991/A1:1997, Geotechniek - Berekeningsmethode voor funderingen op palen - Drukpalen.