Research Article
Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar
Table 3
Analysis of principal stress difference on the rock surrounding the roof during failure.
| ā | Influence of boundary pillar | Influence of the 051604 working face | Influence of the 051606 working face |
| Influence value of each stage (MPa) | 4.4 | 5.6 | 8 | Total impact value (MPa) | 4.4 | 10 | 18 | Influence degree | Strong | Stronger | Extremely strong |
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