Research Article
Vulnerability Analysis of Soft Caving Tunnel Support System and Surrounding Rock Optimal Control Technology Research
Table 3
Quality ranks of coal strength and quantitative scores.
| | Name | Quantitative data and description |
| | Uniaxial compressive strength (MPa) | >25 | | | | <10 | | Affecting the quality rank | Hard | Relatively Hard | Medium | Relatively soft | Soft | | Scores | 2 | 4 | 6 | 8 | 10 |
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