Table 1 Mechanical parameters of coal and rock mass.

From: The mechanistical principles and engineering application of roof- cutting for roadway protection in advance of the working face

Lithology

Thick-ness/m

Bulk modu-

lus/Gpa

Shear modu-

lus/Gpa

Cohesion

/Mpa

Friction

angle/°

Tensile

strength/Mpa

Sandy mudstone

11.2

2.56

2.36

2.16

36

0.58

Medium-grained sandstone

9.3

2.89

2.54

3.2

40.9

3.7

Sandy mudstone

9.7

2.56

2.36

2.16

36

0.58

Fine-grained sandstone

4.4

21.01

13.52

3.2

42

1.29

Sandy mudstone

7.2

2.56

2.36

2.16

36

0.58

Fine-grained sandstone

4.1

21.01

13.52

3.2

42

1.29

Sandy mudstone

5.1

2.56

2.36

2.16

36

0.58

Coal

2.15

4.91

2.01

1.25

32

0.15

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