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Total Cohesion

The FHWA GEC 010 method allows the adhesion coefficient α to be calculated according to the total cohesion cu determined by the laboratory triaxial CIUC test.

If the total cohesion is determined by a different type of test (UC,UU), it is corrected before calculation based on the following relationships (Chen and Kulhawy 1993):

  • For cu according to the UC test:

  • For cu according to the UU test:

where:

cu(CIUC)

-

total cohesion determined by the laboratory triaxial CIUC test

cu(UC)

-

total cohesion determined by the laboratory triaxial UC test

cu(UU)

-

total cohesion determined by the laboratory triaxial UU test

σef

-

effective stress

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