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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 [kPa]

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.