Research Article
Study on Stability Control of Retained Gob-Side Entry by Blasting Fracturing Roof Technology in Thick Immediate Roof
Table 2
Mechanical parameters of coal and rock.
| Lithology | E (GPa) | σc (MPa) | σt (MPa) | | c (MPa) | Ф (deg.) |
| Silty mudstone | 11.3 | 29 | 1.8 | 0.29 | 6.8 | 35 | Fine sandstone | 50.9 | 86.7 | 2.8 | 0.24 | 13.2 | 49 | Pelitic siltstone | 30.4 | 50.4 | 2.2 | 0.28 | 11.1 | 36 | Coal | 5.8 | 9.1 | 1.4 | 0.32 | 3.4 | 29 | Mudstone | 9.7 | 21.1 | 1.59 | 0.3 | 5.3 | 32 | Medium fine sandstone | 46.4 | 39.5 | 2.7 | 0.26 | 11.7 | 40 |
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