Table 5: Calibrated microparameters.

LithologyMatrix propertiesContact properties
Density (kg/m3)K (GPa)G (GPa)kn (GPa/m)ks (GPa/m)Cj (MPa)Φj (peak/residual, °) (MPa)

Mudstone #123700.530.3254.6921.881.8535/300.30
Gritstone #126520.860.5791.3036.524.2037/330.80
Mudstone #223460.230.1222.298.921.1535/300.20
Number 9 coal14980.130.0813.675.470.7030/240.10
Mudstone #323460.300.2131.9212.771.4535/300.28
Medium-fine sandstone26411.981.30208.6983.476.3030/241.00
Gritstone #224501.931.16113.2945.326.9037/331.20
Mudstone #423321.360.70133.7353.493.6035/300.50
Number 11 coal14980.980.5196.5838.632.7030/240.40