Research Article
Thick-Anchored Dual-Layer Locking Supporting Technique in Gob-Side Entry Driving with the Narrow Pillar: A Case Study
Table 3
Rock strata properties used in the numerical model.
| | Rock strata | Properties of rock mass | | Thickness (m) | Density (kg/m3) | Cohesion (MPa) | Friction angle (°) | Tensile strength (MPa) | Bulk modulus (GPa) | Shear modulus (GPa) |
| | Sandstone | 50 | 2264 | 3.62 | 38 | 1.24 | 5.43 | 4.15 | | Sandy mudstone | 31 | 2395 | 2.87 | 36 | 1.78 | 6.42 | 5.76 | | Siltstone | 11 | 2589 | 3.95 | 32 | 2.79 | 6.87 | 3.97 | | Fine sandstone | 14 | 2564 | 2.81 | 38 | 1.65 | 7.42 | 2.15 | | Siltstone | 8 | 2489 | 3.94 | 32 | 2.87 | 9.4 | 3.4 | | Sandy mudstone | 6.8 | 2301 | 3.79 | 38 | 2.13 | 5.42 | 2.15 | | Coal seam | 3.2 | 1421 | 1.41 | 31 | 0.97 | 2.43 | 1.8 | | Fine sandstone | 6 | 2489 | 1.65 | 32 | 1.45 | 4.2 | 1.97 | | Sandstone | 20 | 2264 | 3.8 | 38 | 1.96 | 2.42 | 2.15 |
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