Research Article
Model of Overlying Strata Structure in Large Mining Height Excavating Condition and Calculation of Support Working Resistance
Table 5
The physical and mechanical characteristics of the nonhinged roof structure of No. 8218 large mining height working face.
| | Serial number | Lithologic characters | Density kg/m3 | Thickness (m) | Tensile strength (MPa) | Roof stress (MPa) | Break step (m) | Broken block weight (MN) |
| | 0 | Coal seam | 1423 | 1.22 | 3.13 | 0.01 | 3.45 | 0.30 | | 9 | Sandy shale | 2514 | 5.22 | 2.47 | 0.19 | 17.11 | 5.79 | | 8 | Coal seam | 1423 | 0.96 | 3.13 | 0.24 | 30.89 | 7.42 | | 7 | Sandy shale | 2514 | 5.21 | 2.47 | 0.19 | 17.11 | 5.79 |
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