Research Article
Cocompetitive Characteristics and Quantitative Design of Engineering Parameters for Coal Gas Predrainage Boreholes
Table 2
Prediction of gas drainage effect at different spacing of boreholes.
| | Index | Expected value | Borehole spacing | | 2 m | 3 m | 4 m | 5 m | 6 m | | Predicted value | Predicted value | Predicted value | Predicted value | Predicted value |
| | Residual gas volume (m3/t) | <8 | 4.38 | 6.14 | 6.99 | 7.76 | 8.66 | | Gas extraction rate (%) | >40 | 67.3 | 54.2 | 47.8 | 42.1 | 35.4 | | Maximum coal matrix gas pressure (MPa) | <0.74 | 0.097 | 0.119 | 0.136 | 0.152 | 0.169 | | Are all constraints met? | ✓ | ✓ | ✓ | ✓ | ✓ |
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