Research Article
Constant-Resistance, Rigid, and Flexible Coupling Support Technology for Soft Rock Entrances in Deep Coal Mines:A Case Study in China
Table 3
Physical-mechanical parameters of rocks.
| | Lithology name | Bulk density (kg·m−3) | Bulk modulus (GPa) | Shear modulus (GPa) | Tensile strength (MPa) | Adhesion (MPa) | Angle of internal friction (°) |
| | Siltstone | 2510 | 4.8 | 2.8 | 1.2 | 3.0 | 30 | | Siltstone | 2530 | 4.8 | 2.8 | 1.2 | 3.0 | 30 | | Argillaceous sandstone | 2320 | 2.4 | 1.1 | 0.6 | 1.2 | 27 |
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