Research Article
Theoretical Study and Numerical Simulation Research on the Effect of Coal-Rock Interface on Multistaged Fracturing in the Roof of Outburst Coal Seam
Table 1
Mechanical parameters of numerical simulation model.
| | Parameters | Medium sandstone | Sandy mudstone | Mudstone | Soft coal |
| | Mean degree | 3 | 3 | 3 | 3 | | Compressive strength (MPa) | 90 | 72 | 15 | 2 | | Elastic modulus (GPa) | 25 | 13 | 8 | 5 | | Poisson’s ratio | 0.22 | 0.31 | 0.31 | 0.33 | | Coefficient of residual strength | 0.1 | 0.1 | 0.1 | 0.1 | | Coefficient of porosity pressure | 1 | 1 | 1 | 1 |
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