Research Article
Model of Overlying Strata Structure in Large Mining Height Excavating Condition and Calculation of Support Working Resistance
Table 4
The physical and mechanical characteristics of the roof combination of cantilever structure of No. 8218 large mining height working face.
| Serial number | Lithology | Density kg/m3 | Thickness (m) | Tensile strength (MPa) | Top plate force (MPa) | Breaking step (m) | Weight of broken block (MN) |
| 6 | Fine sandstone | 2438 | 1.60 | 4.06 | 0.09 | 4.90 | 1.21 | 5 | Sandy shale | 1426 | 3.10 | 2.47 | 0.11 | 1.56 | 0.32 | 4 | Medium sandstone | 2453 | 9.20 | 5.21 | 0.22 | 3.80 | 1.66 | 3 | Coarse sandstone | 2683 | 9.00 | 6.22 | 0.44 | 15.47 | 3.40 | 2 | Fine sandstone | 2645 | 2.30 | 4.06 | 0.59 | 8.88 | 1.34 | 1 | Sandy shale | 2468 | 0.90 | 2.47 | 0.05 | 3.43 | 0.16 | | Coal seam | 1476 | 4.14 | | | | |
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