Research Article
Mechanism and Control Technology of Rockburst Induced by Thick Hard Roof and Residual Coal Pillar: A Case Study
Table 1
Physical and mechanical parameters of the rocks and location of key stratum.
| | Name | Strata thickness (m) | Tensile strength (MPa) | Elastic modulus (GPa) | Poisson’s ratio | Cohesion (MPa) | Friction angle (°) | Bulk density (kg/m3) | Note |
| | Fine sandstone | 38.50 | 0.42 | 1.39 | 0.25 | 7.30 | 30.50 | 2152 | | | Siltstone | 43.50 | 0.76 | 2.36 | 0.27 | 6.90 | 29.20 | 2293 | PKS | | Sandy mudstone | 36.00 | 1.10 | 1.45 | 0.25 | 5.50 | 22.60 | 2330 | | | Fine sandstone | 46.00 | 1.35 | 1.62 | 0.26 | 6.87 | 29.90 | 2219 | SKS6 | | Sandy mudstone | 35.50 | 1.07 | 1.78 | 0.26 | 8.28 | 26.80 | 2219 | | | Siltstone | 21.00 | 2.44 | 2.05 | 0.24 | 10.40 | 27.40 | 2350 | SKS5 | | Sandy mudstone | 39.50 | 1.99 | 1.52 | 0.31 | 9.90 | 25.90 | 2291 | | | Fine sandstone | 39.50 | 2.46 | 3.08 | 0.25 | 10.50 | 24.90 | 2323 | SKS4 | | Sandy mudstone | 11.98 | 2.76 | 2.89 | 0.26 | 21.70 | 21.60 | 2217 | | | Coal | 0.5 | 1.37 | 1.99 | 0.28 | 19.20 | 28.20 | 1274 | | | Sandy mudstone | 8.00 | 3.36 | 6.53 | 0.20 | 19.70 | 23.60 | 2217 | | | 1-1 coal seam | 3.00 | 1.37 | 1.99 | 0.28 | 19.20 | 28.20 | 1274 | | | Sandy mudstone | 5.00 | 4.22 | 7.24 | 0.20 | 19.70 | 23.60 | 2111 | | | 1-2 coal seam | 1.00 | 1.37 | 1.99 | 0.28 | 19.20 | 28.20 | 1274 | | | Siltstone | 8.00 | 6.62 | 6.72 | 0.24 | 23.80 | 22.70 | 2343 | SKS3 | | Sandy mudstone | 16.00 | 5.24 | 7.92 | 0.22 | 18.90 | 26.20 | 2321 | | | 2-2 coal seam | 3.50 | 1.47 | 1.99 | 0.28 | 19.20 | 24.20 | 1274 | | | Sandy mudstone | 20.00 | 4.66 | 9.60 | 0.25 | 23.10 | 33.30 | 2350 | | | Coal | 0.5 | 1.57 | 1.99 | 0.28 | 19.20 | 28.20 | 1274 | | | Sandy mudstone | 14.50 | 5.03 | 7.59 | 0.21 | 24.40 | 28.30 | 2363 | | | Siltstone | 22.50 | 8.03 | 11.85 | 0.24 | 32.40 | 26.40 | 2328 | SKS2 | | Sandy mudstone | 8.00 | 5.97 | 8.56 | 0.25 | 27.80 | 26.60 | 2403 | | | Fine sandstone | 9.00 | 9.26 | 12.48 | 0.25 | 35.60 | 24.50 | 2301 | SKS1 | | Sandy mudstone | 6.00 | 6.66 | 10.61 | 0.25 | 27.80 | 26.60 | 2430 | | | 4-2 coal seam | 6.50 | 1.38 | 5.44 | 0.28 | 19.20 | 28.20 | 1274 | | | Sandy mudstone | 8.00 | 4.73 | 10.65 | 0.25 | 27.80 | 26.60 | 2421 | | | Coal | 1.20 | 4.85 | 1.99 | 0.28 | 19.20 | 28.20 | 1274 | | | Sandy mudstone | 2.50 | 5.66 | 12.3 | 0.25 | 25.60 | 28.30 | 2397 | | | Coal | 1.00 | 1.38 | 1.99 | 0.28 | 19.20 | 28.20 | 1274 | | | Sandy mudstone | 25.00 | 6.04 | 14.6 | 0.25 | 27.70 | 28.60 | 2326 | | | Coal | 2.00 | 1.57 | 1.99 | 0.28 | 19.20 | 28.20 | 1274 | | | Sandy mudstone | 21.00 | 6.71 | 15.5 | 0.25 | 27.70 | 28.60 | 2482 | | | Fine sandstone | 22.00 | 6.60 | 9.59 | 0.26 | 16.60 | 27.30 | 2286 | | | Medium-grained sandstone | 5.00 | 6.13 | 10.32 | 0.22 | 6.56 | 46.90 | 2442 | |
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