Table 2 The percentage of tension and shear microcracks at various stages during loading.

From: Experimental investigation of the acoustic emission and energy evolution of bedded coal under uniaxial compression

Nos.

0-σcc stage

σcc-σcistage

σci-σcd stage

σcd-σp stage

After peak stage

Total

Tension/%

Shear/%

Tension/%

Shear/%

Tension/%

Shear/%

Tension/%

Shear/%

Tension/%

Shear/%

Tension/%

Shear/%

0°-1

10.71

1.61

31.59

5.98

13.60

2.97

23.67

4.66

3.70

1.51

83.27

16.73

0°-2

3.82

0.60

18.40

3.43

21.00

3.11

39.68

4.17

5.65

2.41

88.55

11.45

0°-3

11.37

1.28

29.99

3.40

15.95

1.89

24.20

5.38

6.46

2.23

87.96

12.04

30°-1

3.91

2.26

6.75

1.84

5.44

3.95

50.88

17.71

7.02

3.45

74.00

26.00

30°-2

6.70

2.40

9.13

1.95

12.11

4.25

51.40

11.80

0.16

0.09

79.50

20.50

30°-3

4.64

4.95

4.18

5.00

13.68

7.76

39.67

19.70

0.28

0.14

62.44

37.56

60°-1

0.43

1.00

1.02

4.10

0.97

3.79

10.64

29.52

17.91

30.62

18.42

81.58

60°-2

0.32

1.54

0.84

3.45

1.48

10.26

10.78

50.86

4.47

15.99

17.89

82.11

60°-3

0.31

1.74

0.48

6.06

1.05

9.28

7.89

44.87

9.30

19.02

19.02

80.98

90°-1

7.91

1.04

15.09

1.07

5.26

0.44

19.85

2.08

34.39

12.87

82.50

17.50

90°-2

9.24

3.06

3.75

0.83

6.74

0.87

49.69

3.06

12.23

10.53

81.65

18.35

90°-3

1.79

0.41

5.39

0.83

10.30

1.77

50.23

14.36

10.31

4.61

78.02

21.98

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