Research Article
Research on Optimization of Coal Pressure Relief Borehole Parameters under High-Stress Conditions
Table 2
Mechanical parameters of the coal.
| | Elastic modulus (GPa) | Shear modulus (GPa) | Density (/kg m3) | Internal friction angle (°) | Tensile strength (MPa) | Cohesive force (MPa) |
| | 7.1 | 4.3 | 1640 | 30 | 5.6 | 2.1 |
|
|
