Research Article
Increasing Permeability of Coal Seam and Improving Gas Drainage Using a Liquid Carbon Dioxide Phase Transition Explosive Technology
Table 1
Mechanical properties of each geological unit.
| Lithology | Modulus of elasticity E (GPa) | Uniaxial compressive strength σc (MPa) | Uniaxial tensile strength σf (MPa) | Poisson’s ratio | Friction angle (°) |
| Sandy mudstone | 17.3 | 31.1 | 2.45 | 0.23 | 32 | Coal | 5.2 | 13.6 | 1.68 | 0.3 | 29 | Mudstone | 11.4 | 25.3 | 1.87 | 0.29 | 30 |
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