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Mixed (Cohesive and Granular) Soil Properties

Mixed (Cohesive and Granular) Soil Properties

Mixed (Cohesive and Granular) Soil Properties

(OP)
I am designing sheeting in soils that have both cohesive and non-cohesive properties.  I am having trouble when comparing my hand calcs to the Pile Buck output (mostly the active and passive pressures).  I have the Pile Buck Design manual that shows step-by-step procedures for either all cohesive soils or all granular soils, but nothing with a mixture of the two.  An AASHTO design manual states that for the active pressure, you subtract cohesion (2*C*sqrt(Ka)) and for the passive pressure you add cohesion (2*C*sqrt(Kp)).  I guess my questions are how does pile buck account for cohesion in mixed soils, and what are the active and passive pressures in a mixed soil?   

RE: Mixed (Cohesive and Granular) Soil Properties

For fines greater than 20%, use cohesive values for piles, ka and kp.

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