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:
where: | 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 | - | ||
s | - | ||
β | - |
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 | - | |
qc, z, a | - | tip resistance at depth h |
Literature:
NEN 6743:1991/A1:1997, Geotechniek - Berekeningsmethode voor funderingen op palen - Drukpalen.