Original Cam-Clay Model
The Original Cam-Clay model is based on the assumption that the soil is isotropic, elasto-plastic, deforms as a continuum, and it is not affected by creep. The yield surface of the Cam clay model is described by the equation
where is the equivalent stress, is the pressure, is the pre-consolidation pressure, and is the slope of the critical state line in space.
The pre-consolidation pressure evolves as the void ratio (and therefore the specific volume ) of the soil changes. A commonly used relation is
where is the virgin compression index of the soil. A limitation of this model is the possibility of negative specific volumes at realistic values of stress.
An improvement to the above model for is the bilogarithmic form
where is the appropriate compressibility index of the soil.
Read more about this topic: Critical State Soil Mechanics
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