Research Article
An Innovative Balanced-Yielding Support Method for Tunnel in Deep Inclined Strata
Table 2
Mechanical parameters of the 6th coal roof and floor strata (average).
| | Lithology | Elastic modulus (GPa) | Poisson’s ratio | Cohesion (MPa) | Internal friction angle (°) | Uniaxial tensile strength (MPa) | Uniaxial compression strength (MPa) | Bulk density (kg·m-3) |
| | Sandstone | 26 | 0.13 | 17 | 22 | 6.1 | 70 | 2600 | | Mudstone | 6 | 0.35 | 4.6 | 16 | 2.3 | 26 | 2500 | | Coal | 5 | 0.37 | 4.2 | 15 | 2.1 | 24 | 1300 | | Medium sandstone | 21 | 0.18 | 12 | 18 | 5.4 | 38 | 2600 | | Siltstone | 40 | 0.25 | 7.5 | 32 | 9.0 | 47 | 2550 |
|
|
