Research Article
Research and Application of Hydraulic Punching Pressure Relief Antireflection Mechanism in Deep “Three-Soft” Outburst Coal Seam
Table 1
Drilling parameters of process test.
| | Serial number | Position | Inclination (°) | Azimuth (°) | Drilling length (m) | Coal length (m) | Aperture (mm) | Coal output (m3) |
| | S1 | 14 measuring point to the west 23.6 m left side | 26 | 180 | 41 | 19 | 113 | Contrast borehole | | S2 | 14 measuring point to the west 23.6 m left side | 63 | 180 | 26 | 16 | 113 | 3 | | S3 | 14 measuring point 23.6 m west to the right | 74 | 0 | 28 | 17 | 113 | 6 | | S4 | 14 measuring point 23.6 m west to the right | 38 | 0 | 44 | 20 | 113 | 9 |
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