Research Article
Classification and Application of Roof Stability of Bolt Supporting Coal Roadway Based on BP Neural Network
Table 2
The roof stability type and the original data of each index evaluating gene.
| | Evaluation factor | L(m) | D(m) | σc(MPa) | B(m) | N/ | H(m) |
| | Stable (class I) | 0 | >1.56 | 60∼80 | <4.5 | 0∼1 | <100 | | Medium stable type (class II) | 0∼3.0 | 1.56∼1.20 | 40∼60 | 4.5∼5.2 | 1∼2 | 100∼160 | | Falling type (class III) | 3.0∼6.5 | 1.20∼0.67 | 30∼40 | 5.2∼6.0 | 2∼3 | 160∼300 | | Easy to fall type (class IV) | >6.5 | <0.67 | <30 | 7.5∼8.5 | 3∼4 | >300 |
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