Research Article
Roof Failure Mechanism and Control Technology of Large Section Open-Off Cut in Soft Rock Strata with Thin Thickness
Table 3
Rock mechanical parameter of open-off cut.
| | Lithology | ρ (kg·m−3) | σc (MPa) | σt (MPa) | Φ (°) | C (MPa) |
| | Fine sandstone | 2600 | 15.6 | 0.86 | 31 | 1.4 | | Mudstone | 2400 | 8.5 | 0.52 | 22 | 0.9 | | Coarse sandstone | 2400 | 21.6 | 1.16 | 34 | 2.1 | | Sandy mudstone | 1500 | 16.9 | 0.69 | 29 | 1.1 | | Medium sandstone | 2200 | 31.2 | 1.12 | 32 | 2.5 | | 3–1 coal seam | 1500 | 12.1 | 0.81 | 27 | 1.2 | | Siltstone | 2600 | 17.5 | 1.05 | 30 | 2.3 | | Interlayer | 2100 | 3.5 | 0.15 | 20 | 0.2 |
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ρ, density; σc, compressive strength; σt, tensile strength; Φ, internal friction angle; C, cohesion.
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