Research Article
Study on the Support System Mechanism of Entry Roof with Roof Cutting Pressure Releasing Gob-Side Entry Retaining Technology
Table 3
Mechanical parameters of model strata.
| | Lithology | Density (kN/m3) | Tensile strength (MPa) | Internal friction angle (°) | Cohesion (MPa) | Bulk modulus (GPa) | Shear modulus (GPa) |
| | Medium sandstone | 24 | 8.4 | 46 | 15.2 | 11.49 | 7.26 | | Mudstone | 22 | 3.2 | 24 | 10.5 | 0.20 | 0.15 | | Coal | 15 | 2.2 | 22 | 8.5 | 0.12 | 0.11 | | Siltstone | 22 | 4.3 | 28 | 12.8 | 2.11 | 1.86 | | Fine sandstone | 23 | 7.3 | 36 | 15.2 | 3.81 | 3.05 |
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