Table 3 Mechanical parameters of the weak layer.

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

Mechanics properties

Value

Density (g/cm3)

1.59

Cohesive (MPa)

3.2

Poisson's ratio

0.22

Tension strength (MPa)

1.3

Friction angle (°)

13.3

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