Research Article
A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation
Table 24
The evaluation parameters and scores of tailgate N1303.
| | Indictors | Value | Score | Indictors | Value | Score |
| | Surrounding rock integrity (%) | 83.5 | 2 | Mining disturbance time | 1e + 1 m | 5 | | Roof strength (MPa) | 116.65 | 2 | Geological structure | 1S | 2 | | Rib strength (MPa) | 15.33 | 10 | Buried depth (m) | 490 | 6 | | Floor strength (MPa) | 21.32 | 8 | Major horizontal principal stress (MPa) | 13.8 | 4 | | Roof rock type | Coal | 6 | Angle between the axis of the gateway and the major horizontal principal stress (°) | 51 | 6 | | Gateway type | Coal | 9 | Underground water (ml/min) | 25 | 2 | | Dip angle of the surrounding rock (°) | 5 | 2.5 | Underground temperature (°C) | 18.9 | 2 | | Section type | Rectangle | 10 | Inspection and maintenance | Manual | 7.5 | | Section size (m2) | 18 | 6 | Service time (y) | 3 | 2 | | Pillar width (m) | ∞ | 2 | | | | | Vulnerability score | 3.88 | | Vulnerability preevaluation level | II | | Safety coefficient | 3.95 |
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