Table 1 Results of industrial analysis of coal samples.

From: Study on the characteristics of acoustic-thermal precursors of destabilization damage in coal-rock combination bodies with different proportions

Sources of coal samples

Mad (%)

Aad (%)

Vdaf (%)

True density (g/cm3)

Apparent density (g/cm3)

Porosity (%)

Nanyang Gaoping Coal Mine

0.42

11.02

15.09

1.46

1.40

4.11

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