Research Article
Mechanisms of Floor Heave in Roadways Adjacent to a Goaf Caused by the Fracturing of a Competent Roof and Controlling Technology
Table 4
Rock/coal strata parameters used in the numerical model.
| | Rock strata | Density (kg/m3) | Bulk modulus (GPa) | Shear modulus (GPa) | Cohesion (MPa) | Friction angle (°) | Tension strength (MPa) |
| | Mudstone | 2150 | 3.3 | 0.9 | 5.4 | 25 | 0.32 | | Fine sandstone | 2510 | 5.0 | 3.0 | 2.0 | 32 | 1.35 | | Sandy mudstone | 2400 | 4.0 | 2.2 | 2.6 | 30 | 1.12 | | Limestone | 2700 | 10 | 6.6 | 5.5 | 35 | 1.50 | | Coal seam | 1400 | 1.5 | 1.2 | 1.3 | 25 | 0.43 | | Medium sandstone | 2500 | 3.2 | 2.6 | 2.0 | 30 | 1.23 |
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