Table 3 Physical and mechanical parameters.

From: Multifactor analysis and dominant factor identification for coal seam gas drainage borehole instability

Bulk modulus (MPa)

Shear modulus (MPa)

Cohesion (MPa)

Tensile strength (MPa)

Friction angle (°)

Density (kg·m-3)

1650

600

0.6

0.5

23

1400

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