Research Article

The Porosity Dynamic Model of the Compacted Broken Coal

Table 1

The initial mass content of each grain group.

Coal sampleParticle size (mm)d < 0.3d < 0.6d < 1d < 3d < 6d < 10d < 15

1#Underscreening quality0.0920.1780.2470.470.6950.9681.249
Mass ratio0.07360.14250.19780.37630.55640.77501
2#Underscreening quality0.0440.0830.1320.3170.5650.8651.231
Mass ratio0.03570.06740.10720.25750.45900.70271
3#Underscreening quality0.050.1070.1590.3950.6310.9831.303
Mass ratio0.03840.08210.12200.30310.48430.75441