Research Article
Failure Depth of a Floor of a Fully Mechanized Working Face When Passing a Collapse Column
Table 1
Mechanical properties of coal and rock.
| Lithology | Cohesive force (MPa) | Internal friction angle (°) | Uniaxial compressive strength (MPa) | Elastic modulus (GPa) | Poisson’s ratio | Tensile strength (MPa) |
| K8 sandstone | 12.89 | 34.70 | 92.10 | 25.35 | 0.20 | 15.54 | Mudstone | 3.16 | 41.30 | 34.51 | 9.87 | 0.25 | 4.93 | K2 limestone | 15.50 | 47.20 | 91.75 | 27.56 | 0.21 | 15.82 | Siltstone | 5.36 | 42.50 | 35.28 | 10.45 | 0.24 | 5.19 | #10 coal | 0.48 | 43.70 | 7.65 | 2.96 | 0.30 | 0.86 | Fine sandstone | 7.69 | 40.60 | 45.68 | 15.36 | 0.23 | 7.85 |
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