Research Article
Research on Key Factors Influencing Surface Subsidence of Paste Backfilling Mining in Thick Coal Seam of Deep Mine
| Stability grades | Membership degree | Meaning of each grade |
| I | 0.8∼1.0 | Good stability | II | 0.6∼0.8 | Fairly good stability | III | 0.4∼0.6 | General stability | IV | 0.2∼0.4 | Relatively poor stability | V | 0∼0.2 | Poor stability |
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