Research Article
Study on the Mechanism of Gas Ignition by Friction Effect of Hard Quartz Sandstone Instability
| Lithology | Bulk modulus (GPa) | Shear modulus (GPa) | Cohension (MPa) | Internal friction angle (°) | Tensile strength (MPa) | Density (kg·m-3) |
| Coal | 0.97 | 0.90 | 1.10 | 20 | 1.34 | 1300 | Sandy mudstone | 2.20 | 1.21 | 2.10 | 25 | 1.83 | 2340 | Siltstone | 4.40 | 2.90 | 2.50 | 28 | 2.18 | 2696 | Fine sandstone | 5.87 | 4.38 | 3.26 | 30 | 3.19 | 2700 | Quartz sandstone | 8.06 | 7.89 | 5.80 | 32 | 4.54 | 3300 |
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