Table 2 Representative parameters of rock mass.

From: Research on stability analysis and control technology of roadways in the underlying isolated island working face

Rock types

Unit weight/kN·m−3

Tensile strength/MPa

Young’s modulus/MPa

Cohesion/MPa

Friction angle/°

Bulk modulus/MPa

Shear modulus/MPa

Soil layer

18.6

0.028

33.42

0.086

30.6

12

37

Sandstone

23.9

1.18

16,380

2.2

40.08

6659

10,111

Siltstone

24.2

0.62

14,830

1.17

39.38

5493

16,478

Coal seam

12.9

0.33

6860

0.89

37.01

2618

6018

Siltstone

24

0.98

14,260

2.1

38.26

5893

8195

Sandstone

24.3

0.58

11,650

1.1

38.25

4447

10,219

Siltstone

24.4

1.22

12,440

2.29

40.8

4574

14,810

Sandstone

24.9

0.78

11,150

1.27

40.7

4533

6883

Mudstone

23.5

0.53

13,330

1.01

36.28

5375

8545

2–2 Coal

12.9

0.33

6860

0.89

37.01

2618

6018

Mudstone

23.5

0.53

13,330

1.01

36.28

5375

8545

Sandstone

26.2

1.31

14,420

2.4

39.86

6162

7283

Sandstone

24.9

0.78

11,150

1.27

40.7

4533

6883

Sandstone

26.2

1.12

14,420

2.4

39.86

6162

7283

3–1 Coal

12.8

0.48

5240

0.98

36.82

2047

3970

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