Research Article
Model of Overlying Strata Structure in Large Mining Height Excavating Condition and Calculation of Support Working Resistance
Table 6
The physical and mechanical characteristics of the hinged roof structure of No. 8218 large mining height working face.
| | Serial number | Lithologic characters | Density kg/m3 | Thickness (m) | Antitension degree (MPa) | Roof by force (MPa) | Breaking step distance (m) | Broken blocks weight (MN) |
| | 13 | Moderate coarse sandstone | 2685 | 3.8 | 5.27 | 0.26 | 20.86 | | | 12 | Grit stone | 2647 | 5.4 | 6.22 | 0.40 | 23.64 | | | 11 | Fine sandstone | 2732 | 11.4 | 4.06 | 0.68 | 36.93 | 10.24 |
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