Table 1 Structure and mechanical parameters of roof and floor.

From: Research on the mechanism and technology of close range coal seam support and roof cutting collaborative lane control

Lithology

 

Thickness

Compressive strength/MPa

Tensile strength/MPa

Cohesion/MPa

Elastic modulus/GPa

Poisson ratio

Density/kg/m3

Siltstone

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2.1–5.6

4.0

117.88

4.57

11.07

18.09

0.36

2526.8

Fourth limestone layer

3.0–5.5

4.2

129.51

10.97

7.26

19.11

0.23

2671.1

8 Coal

1.8–2.3

2.1

15.19

1.44

0.42

1.84

0.29

1325.5

Pelitic siltstone

0.8–1.2

1.0

59.64

3.60

1.7

6.18

0.28

2543.4

Siltstone

4.5–6.5

5.8

117.88

4.57

11.07

18.09

0.36

2526.8

Mudstone and limestone

0–1.5

0.7

106.96

8.66

16.6

16.94

0.41

2494.4

9 Coal

1.1–1.4

1.3

9.55

0.64

4.08

1.45

0.19

1310.2

Siltstone

2.5–3.7

3.1

117.88

4.57

11.07

18.09

0.36

2526.8

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