Table 1 Physical and mechanical property parameters of the coal and rock.

From: Coal falling trajectory and strength analysis of drum of shearer based on a bidirectional coupling method

Coal seam distribution

Lithology

Density

(kg/m3)

Modulus of elasticity (GPa)

Poisson's ratio (μ)

Tensile strength (MPa)

Firmness coefficient (f)

17 top coal

17 coal

1.31e3

5.24

0.31

1.73

2.38

Hard gangue

limestone

2.63e3

12.1

0.23

3.76

5.1

17 medium coal

17 coal

1.31e3

5.24

0.31

1.73

2.38

gangue

Aluminous mudstone

2.46e3

3.62

0.24

1.19

3.5

17 bottom coal

17 coal

1.31e3

5.24

0.31

1.73

2.38

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