List of Parameters for the Multi-yield Constitutive Model Constitutive Parameter Symbol Type Solid mass density s Fluid mass density f State Parameters Porosity  Permeability k Low strain elastic moduli G1, B1 Reference mean effective p'1 stress Low Strain Elastic Parameters Power exponent n Fluid bulk modulus Kf Friction angle at failure Cohesion c At rest earth pressure Yield and Failure Parameters K0 coefficient Shape of shear stress-strain  , xl , xu curve Dilation Dilation Parameters Dilation parameter (cyclic) Xpp
List of Parameters for the Multi-yield Constitutive Model Constitutive Parameter Symbol Type Solid mass density s State Parameters Fluid mass density f Porosity  Permeability k Low strain elastic moduli G1, B1 Low Strain Elastic Parameters Reference mean effective stress p'1 Power exponent n Fluid bulk modulus Kf Friction angle at failure Yield and Failure Parameters Cohesion c At rest earth pressure coefficient K0 Shape of shear stress-strain curve  , xl , xu Dilation Dilation Parameters Dilation parameter (cyclic) Xpp