Table 1 Experimental results of mechanical parameters.

From: Microcrack monitoring and fracture evolution of coal and rock using integrated acoustic emission and digital image correlation techniques

Type

Number

Elastic E (GPa)

Poisson's ratio μ

Peak stress σp (MPa)

Peak strain εp

Residual stress σr (MPa)

Residual strain εr

Coal

M1

10.85

0.31

9.80

1.16

0.16

1.34

M2

10.15

0.26

8.61

1.41

0.36

1.56

M3

9.75

0.27

6.43

1.10

0.58

1.81

M4

10.25

0.28

8.28

1.22

0.367

1.57

Rock

R1

27.84

0.24

24.13

1.50

4.23

2.53

R2

29.52

0.19

24.72

1.86

5.20

3.93

R3

27.18

0.23

27.41

1.30

5.04

3.37

R4

28.18

0.22

25.42

1.55

4.82

3.28

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