Research Article
Research on Evaluation Index and Application of Rockburst Risk in Deep Strip Mining
Table 2
Physical and mechanical parameters of the rock mass.
| | Lithology | Thickness (m) | Bulk modulus (GPa) | Shear modulus (GPa) | Cohesion (MPa) | Tensile strength (MPa) | Friction angle (°) |
| | Siltstone | 17 | 7.3 | 5.1 | 3.2 | 2.8 | 27 | | Fine sandstone | 15 | 9.2 | 7.7 | 3.5 | 3.2 | 29 | | Sandy mudstone | 3.4 | 4.7 | 2.83 | 2.7 | 2.21 | 31.4 | | Fine sandstone | 5 | 9.2 | 7.7 | 3.5 | 3.2 | 29 | | Medium sandstone | 19 | 11.8 | 8.1 | 4.3 | 4.84 | 34.1 | | Sandy mudstone | 2 | 4.7 | 2.83 | 2.7 | 2.21 | 31.4 | | #3 coal | 9 | 2.1 | 1.78 | 1.8 | 1.25 | 25 | | Sandy mudstone | 2.3 | 4.7 | 2.83 | 2.7 | 2.21 | 31.4 | | Medium sandstone | 21 | 11.8 | 8.1 | 4.3 | 4.84 | 34.1 |
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