Research Article
Coal Seam Gas Extraction by Integrated Drillings and Punchings from the Floor Roadway considering Hydraulic-Mechanical Coupling Effect
Table 2
Measured results of gas pressure and gas content.
| | Drilling position | Drilling number | Vertical depth of measuring point (m) | Measuring point elevation (m) | Maximum pressure (MPa) | Gas content (m3/t) |
| | 50 m inward from the opening of the floor roadway | B1-1 | 904 | -654 | 0.3 | 5.0667 | | B1-2 | 904 | -654 | 0.35 | 4.7032 |
| | 100 m inward from the opening of the floor roadway | B2-1 | 906 | -656 | 0.25 | 4.8338 | | B2-2 | 906 | -656 | 0.3 | 4.1869 |
| | 150 m inward from the opening of the floor roadway | B3-1 | 909 | -659 | 0.4 | 5.4853 | | B3-2 | 909 | -659 | 0.5 | 4.733 |
| | 200 m inward from the opening of the floor roadway | B4-1 | 910 | -660 | 0.35 | 4.8716 | | B4-2 | 910 | -660 | 0.3 | 5.229 |
| | 250 m inward from the opening of the floor roadway | B5-1 | 911 | -661 | 0.3 | 5.0219 | | B5-2 | 911 | -661 | 0.4 | 5.6859 |
| | 300 m inward from the opening of the floor roadway | B6-1 | 913 | -663 | 0.45 | 4.5965 | | B6-2 | 913 | -663 | 0.4 | 4.3454 |
| | 350 m inward from the opening of the floor roadway | B7-1 | 915 | -665 | 0.3 | 5.1005 | | B7-2 | 915 | -665 | 0.3 | 4.8301 |
| | 400 m inward from the opening of the floor roadway | B8-1 | 918 | -668 | 0.4 | 5.0038 | | B8-2 | 918 | -668 | 0.5 | 4.9156 |
| | 450 m inward from the opening of the floor roadway | B9-1 | 918 | -668 | 0.3 | 5.2622 | | B9-2 | 918 | -668 | 0.4 | 5.0408 |
| | 500 m inward from the opening of the floor roadway | B10-1 | 920 | -670 | 0.3 | 5.2569 | | B10-2 | 920 | -670 | 0.35 | 5.1177 |
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