Table 1 Block parameters.

From: Failure characteristics and conditions of rock-coal combination structure with weak layer under dynamic and static stresses

Mechanics properties

Value

Block

 Rock elastic modulus (GPa)

13.5

 Rock Poisson's ratio

0.123

 Coal elastic modulus (GPa)

5.3

 Coal Poisson's ratio

0.2

 Coal cohesive strength (MPa)

1.25–5

 Coal tension strength (MPa)

0.15–2

 Coal friction angle (°)

20–30

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