Research Article
A Method Based on Elastic Mechanics for Judging Compound Hard Roof and Its Application
Table 1
Rock stratum occurrence of 8101 working face.
| No. | Lithology | Thickness (m) | |
| 1 | Coarse sandstone | 23.27 | 6# hard rock | 2 | Medium sandstone | 10.42 | 5# hard rock | 3 | Medium sandstone | 8.58 | | 4 | Fine sandstone | 6.41 | | 5 | Medium sandstone | 10.1 | 4# hard rock | 6 | Coarse sandstone | 9.57 | 3# hard rock | 7 | Coarse sandstone | 2.45 | | 8 | Medium sandstone | 16.08 | 2# hard rock | 9 | Mudstone | 5.24 | | 10 | Medium sandstone | 12.12 | 1# hard rock | 11 | Sandy mudstone | 9 | | 12 | Coal seam | 3.3 | | 13 | Sandy mudstone | 1.6 | | 14 | Coal seam | 21.02 | | 15 | Fine sandstone | 30 | | 16 | Medium sandstone | 15 | |
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