Table 2 Summary of mechanical parameters of different coal bodies.

From: Research and engineering practice on mechanical reaming for pressure relief and rock burst prevention technology in hard coal seam roadways

Serial number

Source of coal sample

Cohesion (MPa)

Internal friction angle (°)

Compressive strength (MPa)

Shear strength (MPa)

C1

Huaibei Haizi Coal Mine – No. 10 Coal Seam

0.2

30.6

9.36

5.72

C2

Shaanxi Yadian Coal Mine – No. 4 Coal Seam

0.56

32.4

13.69

9.25

C3

Xinjiang Tianshan Coal Mine – No. 6 Coal Seam

1.24

32.6

18.66

11.93

C4

Shaanxi Hujiahe Coal Mine – No. 4 Coal Seam

1.88

27.2

24.56

15.60

C5

Inner Mongolia Menkeqing Coal Mine – No. 3–1 Coal Seam

2.0

25.1

32.68

18.03

C6

Shaanxi Xuemiaotan Coal Mine – No. 3 Coal Seam

3.21

28.6

35.12

23.85

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