Research Article
Stability Mechanism and Control Factors on Equipment Removal Area under “Goaf-Roof-Coal” Structure
Table 3
Parameters of roof, floor, and coal.
| | Name | Bulk modulus (GPa) | Shear modulus (GPa) | Cohesion (MPa) | Internal friction angle (°) | Bulk density (kN.m−3) |
| | Laterite | 1.5 | 0.6 | 3.2 | 12.0 | 13.0 | | Main roof | 8.3 | 4.1 | 8.0 | 23.0 | 26.0 | | Immediate roof | 7.3 | 3.9 | 6.0 | 21.0 | 24.0 | | Coal seam | 2.4 | 3.2 | 6.0 | 26.1 | 14.0 | | Floor | 8.3 | 4.1 | 6.0 | 21.0 | 27.0 |
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