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Adhesion coefficient

Reference values of the adhesion coefficient α are listed in the following table:


Empirical adhesion coefficient α

Pile material Soil consistency Cohesion range
cu [kN/m2]
Adhesion coefficient α [-]
Timber and concrete piles Very soft 0 - 12 0,00 - 1,00
Soft 12 - 24 1,00 - 0,96
Medium stiff 24 - 48 0,96 - 0,75
Stiff 48 - 96 0,75 - 0,48
Very stiff 96 - 192 0,48 - 0,33
Steel piles Very soft 0 - 12 0,00 - 1,00
Soft 12 - 24 1,00 - 0,92
Medium stiff 24 - 48 0,92 - 0,70
Stiff 48 - 96 0,70 - 0,36
Very stiff 96 - 192 0,36 - 0,19


Literature:

NAVFAC DM 7.2, Foundation and Earth Structures, U.S. Department of the

Navy, 1984.




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