E	Young’s modulus
K	Bulk modulus
M	Slope of the critical state line (MCC model)
p	Mean effective stress
pc	Initial size of the compressive yield limit (MCC model)
pp	Pore pressure
pt	Tensile strength
q	Shear (deviatoric) stress
κ	Slope of the swelling line (MCC model)
λ	Slope of the normal consolidation line (MCC model)
v	Poisson’s ratio
σax	Axial stress (at failure)
σcon	Confining pressure
σres	Residual (post-failure) strength
φ	Porosity
ν	Specific volume