Research Article
Influence Factors’ Analysis of the Face-End Roof Leaks Exposed to Repeated Mining Based on Multiple Linear Regression
Table 6
The mechanical parameters of joints.
| Category | Jkn (MPa) | Jks (MPa) | Jfri (°) | Jcoh (MPa) | Jten (MPa) |
| Sandstone | 6368 | 5840 | 25 | 3.12 | 2.08 | Medium sandstone | 5500 | 5960 | 22 | 2.38 | 1.56 | Siltstone | 4540 | 4800 | 19 | 1.85 | 0.86 | Fine sandstone | 3600 | 4380 | 18 | 1.27 | 0.75 | Mudstone | 2550 | 2240 | 17 | 0.86 | 0.22 | Coal | 2350 | 2320 | 15 | 0.45 | 0.04 |
|
|