The new API Recommended Practice for Geotechnical Engineering: RP 2GEO
2010
The Brinch Hansen (1970) method included bearing
capacity factors Nc and Nq that were the same as those
recommended by Meyerhof (1951) and Vesic (1975).
The Nγ factor was approximated by an empirical relationship Nγ = 1.5 (Nq − 1) tanφ′. Values of φ′ used for
the derivation of Nc and Nq are based on plane strain
conditions, φ′PS (rather than triaxial conditions, φ′TX),
and it was suggested that φ′PS may be (conservatively)
taken as 10% higher than φ′TX.
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