Research Article
The Coal Pillar Width Effect of Principal Stress Deflection and Plastic Zone Form of Surrounding Rock Roadway in Deep Excavation
Table 2
Rock physical and mechanical parameters table.
| | Rock formation | Internal friction angle (°) | Cohesion (MPa) | Density (kg/m3) | Shear modulus (GPa) | Bulk modulus (GPa) | Uniaxial tensile strength (MPa) |
| | Sandstone | 25 | 2.8 | 1500 | 4.8 | 5.4 | 1.5 | | Mudstone | 30 | 5.24 | 2200 | 5.04 | 8.82 | 1.48 | | Coal seam | 34 | 5.36 | 2500 | 4.54 | 10.44 | 2.6 | | Sandy mudstone | 38 | 16 | 2700 | 9.0 | 10.2 | 7.5 | | Limestone | 35 | 7.9 | 2300 | 5.3 | 8.9 | 8.71 |
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