Research Article
Study on the Migration Law of Overlying Strata on the Working Surface of Large Mining Height in Y.C.W Coal Mine
Table 1
Mechanical parameters of overlying rock of working face and identification of key horizon.
| No. | Rock name | Tensile strength (MPa) | Elastic modulus (GPa) | Poisson ratio | Cohesion (MPa) | Angle of internal friction (°) | Density (kg/m3) | Thickness (m) | Depth (m) | Key strata location |
| 1 | Silty mudstone | 2.64 | 1.14 | 0.22 | 4.27 | 39.2 | 2200 | 27 | 309 | | 2 | Siltstone | 2.4 | 1.39 | 0.22 | 9 | 42 | 2600 | 4 | 313 | | 3 | Medium sandstone | 3.12 | 0.85 | 0.22 | 7 | 39.2 | 2500 | 48 | 361 | Main key stratum | 4 | Mudstone | 1.5 | 0.78 | 0.34 | 6.89 | 24.7 | 2350 | 15 | 376 | | 5 | Fine sandstone | 3.86 | 1.44 | 0.23 | 4.83 | 52.4 | 2350 | 7 | 383 | | 6 | Mudstone | 1.15 | 0.56 | 0.34 | 6.89 | 24.7 | 2350 | 6 | 389 | | 7 | Fine sandstone | 3.51 | 1.52 | 0.23 | 4.83 | 52.4 | 2350 | 6 | 395 | | 8 | Silty mudstone | 2.64 | 1.14 | 0.22 | 4.27 | 39.2 | 2200 | 22 | 417 | | 9 | Medium sandstone | 3.12 | 0.82 | 0.23 | 7 | 39.7 | 2500 | 2 | 419 | | 10 | Grit stone (with water) | 3.27 | 1.46 | 0.23 | 4.66 | 46.7 | 2350 | 51 | 470 | Inferior key strata II | 11 | 1# coal seam | 1.32 | 0.67 | 0.25 | 0.75 | 40.2 | 1500 | | | | 12 | Siltstone | 2.4 | 1.39 | 0.22 | 9 | 42 | 2600 | 1 | 471 | | 13 | Medium sandstone | 3.05 | 1.82 | 0.23 | 7 | 39.7 | 2500 | 3 | 474 | | 14 | Fine sandstone | 3.79 | 1.22 | 0.23 | 4.83 | 52.4 | 2350 | 15 | 489 | Inferior key strata I | 15 | Siltstone | 2.35 | 1.28 | 0.22 | 9 | 42 | 2600 | 3 | 492 | | 16 | 2# coal seam | 1.35 | 0.71 | 0.25 | 0.75 | 40.2 | 1500 | 2 | 494 | | 17 | Mudstone | 1.57 | 0.68 | 0.34 | 6.89 | 24.7 | 2350 | 8 | 502 | |
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