Research Article
Mechanism of Coal Burst and Prevention Practice in Deep Asymmetric Isolated Coal Pillar: A Case Study from YaoQiao Coal Mine
Table 4
Parameters of pressure relief measures for I-I section.
| Drilling number | Drilling depth (m) | Explosive quantity (kg) | Elevation angle (°) | Loaded length (m) | Hole sealing length (m) | Drilling diameter (mm) |
| 1# | 40 | 48 | 80 | 12 | 16 | 63 | 2# | 50 | 60 | 70 | 15 | 20 | 63 | 3# | 60 | 80 | 55 | 20 | 22 | 63 | 4# | 40 | 50 | 80 | 12 | 16 | 63 | 5# | 50 | 60 | 70 | 15 | 20 | 63 | 6# | 60 | 80 | 55 | 20 | 22 | 63 | 7# | 55 | — | 2 | — | — | 153 | 8# | 20 | — | 2 | — | — | 153 |
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