Research Article
A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation
Table 25
Relevant parameters of tailgate N1303.
| ā | Parameters | Value | Dimension |
| Parameters of surrounding rock | Cohesion | 0.4 | MPa | Internal friction angle | 21 | (o) | Section size | Width | 5000 | mm | Height | 3600 | mm | Bolt support parameter | Length | 2400 | mm | Strength | 335 | MPa | Diameter | 22 | mm | Column spacing | 800 | mm | Row spacing | 800 | mm |
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