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EN 1997-2

The EN 1997-2 standard determines the maximum pressure at pile base (maximum resistance) pmax, base from the corresponding ith penetration test as follows:

where:

qc, I, mean

-

mean from values  qc, I   (see Addenum D.7 in EN 1997-2)

qc, II, mean

-

mean of the minimum cone tip resistances qc, II   (see Addenum B4 in EN 1997-3)

qc, III, mean

-

mean of the cone tip resistance qc, III (see Addenum B4 in EN 1997-3)

αp

-

pile base coefficient (pile class factor)

s

-

pile shape coefficient

β

-

expaned 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 (shaft resistance) pmax, shaft  is given by:

where:

αs

-

shaft friction coefficient

qc, z, a

-

tip resistance at depth h

Literature:

EN 1997-2 Geotechnical design. Ground investigation and testing.