Research Article
A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation
Table 22
Evaluation parameters and scores of the main inclined shaft.
| | Indictors | Value | Score | Indictors | Value | Score |
| | Surrounding rock integrity (%) | 52 | 6 | Mining disturbance time | 1 | 2 | | Roof strength (MPa) | 25.48 | 8 | Geological structure | 2S | 4 | | Rib strength (MPa) | 25.48 | 8 | Buried depth (m) | 178 | 4 | | Floor strength (MPa) | 25.48 | 8 | Major horizontal principal stress (MPa) | 3.2 | 2 | | Roof rock type | Rock | 3 | Angle between the axis of the gateway and the major horizontal principal stress (°) | 42° | 6 | | Gateway type | Rock | 3 | Underground water (ml/min) | 600 | 8 | | Dip angle of the surrounding rock (°) | 15 | 5 | Underground temperature (°C) | 17.3 | 2 | | Section type | Straight wall semicircle arch | 6 | Inspection and maintenance | Manual | 7.5 | | Section size (m2) | 24.7 | 10 | Service time | 65 | 10 | | Pillar width (m) | ∞ | 2 | | | | | Vulnerability score | 5.67 | | Vulnerability preevaluation level | IV | | Safety coefficient | 5.2 |
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