Research Article
Numerical Investigation of Gob-Side Entry Retaining through Precut Overhanging Hard Roof to Control Rockburst
Table 2
Strata material properties.
| | Location | Lithology | Thickness (m) | Bulk modulus (GPa) | Shear modulus (GPa) | Density (kg/m3) | Frictional angle (ri) | Cohesion (MPa) | Tensile strength (MPa) |
| | Roof | Siltstone | 2 | 8.1 | 3.3 | 2500 | 27.9 | 16 | 7.6 | | Roof | Fine sandstone | 30 | 10.3 | 6.3 | 2600 | 32.7 | 14.6 | 10.2 | | Roof | Grit stone | 25 | 9 | 3.5 | 2340 | 31 | 12 | 5.9 | | Main roof | Fine sandstone | 41 | 10.2 | 4.7 | 2500 | 32 | 9.8 | 6.5 | | Roof | Siltstone | 7 | 8.1 | 3.3 | 2500 | 27.9 | 16 | 7.6 | | Coal seam | Coal | 12 | 3.5 | 1.6 | 1340 | 31 | 1.4 | 1.6 | | Immediate floor | Tuff | 4.9 | 9.5 | 5.8 | 2500 | 31.2 | 13.5 | 9.7 | | Floor | Fine sandstone | 25.8 | 10.3 | 6.3 | 2600 | 32.7 | 14.6 | 10.2 |
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