Table 4 Percentage of AE count frequency for each stage of the coal-rock combined body.

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

Sample number

AE frequency

I (%)

II (%)

III (%)

IV (%)

C-11

0.14

1.72

28.01

70.12

CR-11

0.01

5.01

47.35

47.63

CR-22

0.04

8.40

41.21

50.35

CR-31

0.96

12.27

37.75

49.01

CR-43

0.76

21.01

38.50

39.73

CR-52

2.01

6.55

11.35

80.09

R-12

0.61

0.86

0.43

98.10

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