Research Article
Research on the Deformation Characteristics and Support Technology of a Bottom Gas Extraction Roadway under Repeated Interference
Table 1
Rock mechanics parameters.
| | Stratum | Thickness (m) | Compressive strength (MPa) | Elastic modulus (GPa) | Poisson ratio | Friction angle (°) | Density (kg·m−3) |
| | Sandy mudstone | 11 | 20 | 7.5 | 0.26 | 34 | 2500 | | Fine sandstone | 8 | 45 | 15 | 0.22 | 38 | 2550 | | Sandy mudstone | 3 | 20 | 7.5 | 0.26 | 34 | 2500 | | Ji15-17 coal | 4 | 8 | 1.4 | 0.32 | 26 | 1600 | | Sandy mudstone | 5 | 20 | 7.5 | 0.26 | 34 | 2500 | | Limestone | 19 | 56 | 15 | 0.19 | 40 | 2600 | | Mudstone | 5 | 18.9 | 6.5 | 0.28 | 32 | 2300 |
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