Shock and Vibration / 2019 / Article / Tab 2

Research Article

Analysis of the Occurrence Mechanism for Coal and Gas Outburst Based on Multiple Discriminant Indices

Table 2

Mechanical parameters of coal and rock.

Coal and rockDensity (kg·m−3)Bulk modulus (GPa)Shear modulus (GPa)Internal friction angle (°)Cohesion (MPa)Tensile strength (MPa)

Fine sandstone260037.426.94515.47.8
Sandy mudstone240024.212.5466.84.1
Medium grain sandstone24003421.43613.46.5

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