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| No | Quantitative index | Fuzzy membership degree |
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| 1 | Mining depth | When the mining depth is greater than 800, the membership degree is 0, less than 200 is 1, and the middle is 0.5. |
| 2 | Coal seam | When the dip angle of the coal seam is greater than 54°, the membership degree is 0; when the dip angle of the coal seam is 0°, the membership degree is 1. |
| 3 | Overburden structure | When the uniaxial compressive strength (unit: MPa) ∈ (40, 80) (hard overburden), the membership degree is 0.3; when ∈ (20, 40) (medium hard overburden), the membership degree is 0.5; when ∈ (10, 20) (weak overburden), the membership degree is 0.7; when < 10 (very weak overburden), the membership degree is 0.9. |
| 4 | Subsidence before filling | When the roof has no subsidence, the membership degree is taken as 1; when the roof is larger than 100 mm, it is taken as 0. |
| 5 | Nonbackfilling account | When there is no subsidence, the membership degree is taken as 1; when it is greater than 60 mm, it is taken as 0 |
| 6 | Floating coal | When there is no compression, the membership degree is 1; when the compression is greater than 50 mm, the membership degree is 0. |
| 7 | Rock compression | When there is no compression, the membership degree is 1; when the compression is greater than 50 mm, the membership degree is 0. |
| 8 | Volume shrinkage | When there is no shrinkage, the membership degree is 1; when it is greater than 30 mm, it is 0. |
| 9 | Volume compression | When there is no compression, the membership degree is 1; when the compression is greater than 50 mm, the membership degree is 0. |
| 10 | Strength of filling body | When the strength is greater than 5 MPa, the membership degree is 0; when the strength is less than 1 MPa, the membership degree is 1. |
| 11 | Slicing height | When the slice mining height is greater than 5 m, the membership degree is 0; when the slice mining height is less than 1 m, the membership degree is 1. |
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