Table 2 Roof rock load and lateral roof camtilever length.
Serial number | Rock stratum | Thickness/m | Load of rock /kN | Breaking distance /m | Notes |
|---|---|---|---|---|---|
8 | Siltstone | 5.6 | 0.41 | 42.02 | Key stratum 3 |
7 | Fine sandstone | 1.8 | 0.43 | / | |
6 | Sand mudstone | 3.4 | 0.40 | / | |
5 | Finesandstone | 2.1 | 0.33 | / | |
4 | Sand mudstone | 3.6 | 0.28 | / | |
3 | Siltstone | 7.7 | 0.03 | 49.09 | Key stratum 2 |
2 | Fine sandstone | 0.9 | 0.11 | / | |
1 | Siltstone | 3.5 | 0.09 | 29.90 | Key stratum 1 |
