Research Article
A Novel Model of Set Pair Analysis Coupled with Extenics for Evaluation of Surrounding Rock Stability
Table 1
Classification standard to surrounding rock stability.
| Stability class | Rock mass quality | Uniaxial compressive strength (MPa) | Integrality degree of rock mass | Groundwater percolation capacity (L/(min⋅10 m)) | Joint |
| Very good I | 0–0.10 | 200–300 | 0.75–1.00 | 0–5 | 9-10 | Good II | 0.10–0.25 | 100–200 | 0.55–0.75 | 5–10 | 7–9 | Fair II | 0.25–0.40 | 50–100 | 0.30–0.55 | 10–25 | 4–7 | Poor IV | 0.40–0.60 | 25–50 | 0.15–0.30 | 25–125 | 2–4 | Very poor V | 0.60–1.00 | 0–25 | 0–0.15 | 125–250 | 0–2 |
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