Table 3 Physical and mechanical parameters of coal and rock in the model.

From: Research on the causal mechanism of a rock burst accident in a longwall roadway and its prevention measures

Rock layers

Volumetric modulus (GPa)

Shear modulus (GPa)

Tensile strength (MPa)

Internal frictional angle (°)

Cohesion (MPa)

Density (kg m−3)

Roof

24.3

15.2

2.50

30

24.1

2681

Coal

2.8

1.5

0.67

35

1.8

1389

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