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First-grade evaluation index | Second-grade evaluation index | Quantitative value of disaster causing factors |
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U1 | C1 | No fissure hard rock | Mudstone, sandstone, shale | Argillaceous siltstone, sandy mudstone, shale | Dolomite, argillaceous limestone, and other soluble rocks | Dolomitic limestone, dolomite, |
Score | 0–4 | 4–8 | 8–12 | 12–16 | 16–20 |
C2 | I, II | III | IV | V | VI |
Score | 0–4 | 4–8 | 8–12 | 12–16 | 16–20 |
C3 (cm) | Thick layer | Middle-thick layer | Middle layer | Thin layer | Unconsolidated layers |
Score | 0–8 | 8–12 | 12–15 | 15–18 | 18–20 |
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U2 | C4 | Convex type | Flat type | Single slope type | Parallel type below the side of the valley | Parallel type below the valley |
Score | 0–8 | 8–12 | 8–12 | 15–18 | 18–20 |
C5 | Convex type | Flat type | Mixed type | Depression type | River crossing type |
Score | 0–6 | 6–10 | 10–14 | 14–17 | 17–20 |
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U3 | C6 (m) | <1.5 | 1.5–3 | 3–5 or contact surfaces of different rock | 5–8 | >8 |
Score | 0–6 | 6–10 | 10–14 | 14–17 | 17–20 |
C7 | Other parts of fold structure | Wing of the gently dipping fold structure | Wing of the steep fold structure | Core of the gently dipping fold structure | Core of the steep fold structure |
Score | 0–3 | 3–6 | 6–10 | 10–15 | 15–20 |
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U4 | C8 (m) | <200 | 200–500 | 500–1000 | 1000–1500 | >1500 |
Score | 0–2 | 2–6 | 6–14 | 14–16 | 16–20 |
C9 (m) | <100 | 100–300 | 300–500 | 500–700 | >700 |
Score | 14–20 | 10–14 | 6–10 | 4–6 | 0–4 |
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U5 | C10 | No water inrush | Water inrush in water-bearing crack | Water inrush in fault fracture zone | Water inrush in karst pipeline | Water inrush in karst cave |
Score | 0–4 | 4–12 | 12–16 | 16–18 | 18–20 |
C11 | Bedrock fissure water | Clastic rock fissure water | Clastic rock fissure water, bedrock fissure water | Karst fissure water, clastic rock fissure water | Karst fissure water, clastic rock fissure water, bedrock fissure water |
Score | 0–6 | 6–10 | 10–14 | 14–17 | 17–20 |
C12 | Dry | Humid | Dripping | Rainy | Downpour, local inrush water |
Score | 0–2 | 2–8 | 8–12 | 12–16 | 16–20 |
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