Research Article
Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement
Table 2
Rock mass strength estimation and measured maximum principal stress.
| Drilling number | Lithology | Depth (m) | σci (MPa) | σ1m (MPa) | CRP (%) | GSI | mi | σcm (MPa) | σcm/σ1m | Em (GPa) |
| BK212 | Coarse sandstone | 102 | 9.28 | 5.17 | 49 | 55 | 15 | 2.18 | 0.42 | 4.06 | Medium sandstone | 203 | 6.14 | 3.81 | 28 | 50 | 15 | 1.30 | 0.34 | 2.48 | Sandy mudstone | 304 | 7.96 | 3.32 | 82 | 70 | 15 | 2.63 | 0.79 | 8.92 | Fine sandstone | 406 | 21.41 | 9.64 | 27 | 50 | 15 | 4.53 | 0.47 | 4.63 | Fine sandstone | 510 | 43.44 | 14.46 | 99 | 80 | 21 | 21.24 | 1.47 | 37.06 | Fine sandstone | 590 | 40.45 | 13.66 | 93 | 90 | 21 | 26.90 | 1.97 | 63.60 |
| BK209 | Sandy mudstone | 222 | 12.52 | 4.90 | 89 | 75 | 13 | 4.46 | 0.91 | 14.92 | Fine sandstone | 330 | 23.53 | 8.77 | 88 | 75 | 21 | 10.10 | 1.15 | 20.46 | Fine sandstone | 403 | 26.27 | 12.10 | 90 | 90 | 21 | 17.47 | 1.44 | 51.25 | Siltstone | 497 | 36.39 | 13.48 | 62 | 65 | 18 | 11.57 | 0.86 | 14.31 |
| BK213 | Fine sandstone | 300 | 22.91 | 5.74 | 59 | 60 | 21 | 7.02 | 1.22 | 8.51 | Siltstone | 400 | 34.22 | 10.86 | 89 | 75 | 18 | 13.80 | 1.27 | 24.67 | Siltstone | 469 | 33.04 | 11.91 | 89 | 75 | 18 | 13.33 | 1.12 | 24.24 | Fine sandstone | 532 | 128.94 | 15.62 | 73 | 60 | 21 | 39.52 | 2.53 | 17.78 |
| BK207 | Coarse sandstone | 100 | 48.62 | 5.54 | 64 | 60 | 18 | 13.86 | 2.50 | 12.40 | Coarse sandstone | 201 | 12.91 | 5.84 | 88 | 75 | 18 | 5.21 | 0.89 | 15.15 | Coarse sandstone | 260 | 18.86 | 16.64 | 44 | 65 | 21 | 6.00 | 0.36 | 10.30 | Siltstone | 301 | 33.18 | 9.97 | 92 | 80 | 18 | 15.33 | 1.54 | 32.39 | Medium sandstone | 362 | 116.25 | 17.97 | 55 | 60 | 18 | 33.14 | 1.84 | 17.78 | Siltstone | 400 | 51.64 | 18.19 | 98 | 80 | 21 | 25.25 | 1.39 | 40.41 | Siltstone | 449 | 65.46 | 17.97 | 54 | 60 | 21 | 20.06 | 1.12 | 14.39 |
| BK220 | Coarse sandstone | 83 | 46.62 | 4.72 | 44 | 50 | 17 | 10.49 | 2.22 | 9.11 | Coarse sandstone | 150 | 5.67 | 4.89 | 92 | 80 | 21 | 2.77 | 0.57 | 13.39 | Coarse sandstone | 285 | 77.92 | 10.78 | 96 | 70 | 17 | 27.11 | 2.51 | 27.91 | Medium sandstone | 375 | 90.85 | 12.97 | 99 | 70 | 17 | 31.61 | 2.44 | 30.14 | Coarse sandstone | 430 | 22.44 | 10.05 | 75 | 60 | 21 | 6.88 | 0.68 | 8.42 | Sandy mudstone | 562 | 51.40 | 19.57 | 95 | 95 | 21 | 23.27 | 1.19 | 40.32 | Medium sandstone | 603 | 84.64 | 17.04 | 65 | 60 | 21 | 25.94 | 1.52 | 16.36 |
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