Research Article
Study on the Permeability Change Characteristic of Gas-Bearing Coal under Cyclic Loading and Unloading Path
Table 3
Regression expressions of permeability of coal samples under paths I.
| | Tension loading and unloading | /mD | /mD | Constants | Constants | Correlation coefficients |
| | Load 1 | / | 1.83 | 5.7909 | -1.12 | 0.9928 | | Unload 1 | 0.74 | / | 4.2429 | -0.479 | 0.991 | | Load 2 | / | 1.05 | 4.3008 | -0.661 | 0.9772 | | Unload 2 | 0.55 | / | 3.6145 | -0.343 | 0.9854 | | Load 3 | / | 0.70 | 3.6532 | -0.42 | 0.9758 | | Unload 3 | 0.40 | / | 3.259 | -0.248 | 0.992 |
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