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Adhesion of Soil

When performing the analysis in the total stress state for active or passive earth pressure it is necessary to consider the total (undrained) shear strength of soil cu and the adhesion a of soil to the structure face. The value of adhesion a is usually considered as a fraction of the soil cohesion c. The typical values of a for a given range of the cohesion c are listed in the following table.

Common values of the adhesion of soil a


Cohesion c [kPa]

Adhesion a [kPa]

Soft and very soft cohesive soil

0 - 12

0 - 12

Cohesive soil with medium consistency

12 - 24

12 - 24

Stiff cohesive soil

24 - 48

24 - 36

Hard cohesive soil

48 - 96

36 - 46