Research Article
Study on the Permeability Change Characteristic of Gas-Bearing Coal under Cyclic Loading and Unloading Path
Table 4
Regression expressions of permeability of coal samples under path II.
| | Tension loading and unloading | /mD | /mD | Constants | Constants | Correlation coefficients |
| | Load 1 | / | 2.80 | 5.9378 | -1.792 | 0.9809 | | Unload 1 | 1.50 | / | 4.0895 | -0.951 | 0.9816 | | Load 2 | / | 1.90 | 4.1553 | -1.197 | 0.9373 | | Unload 2 | 1.00 | / | 2.9601 | -0.636 | 0.9447 | | Load 3 | / | 1.35 | 3.0488 | -0.847 | 0.9281 | | Unload 3 | 0.75 | / | 2.2446 | -0.476 | 0.9105 |
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