Table 1 FLAC physical‒mechanical parameters for each rock layer.
From: Stress distribution characteristics of overburden strata during thick coal seam top coal caving
Name of rock layer | Density (kg/m3) | Thickness (m) | Bulk modulus (GPa) | Shear modulus (GPa) | Cohesion (MPa) | Internal friction angle (°) | Tensile strength (MPa) |
|---|---|---|---|---|---|---|---|
Gravel bearing coarse sandstone_1 | 2540 | 11.15 | 19.05 | 7.59 | 7.43 | 41.4 | 1.3 |
Mudstone_1 | 2510 | 1.15 | 3.91 | 2.76 | 12.77 | 30.4 | 0.55 |
Gravel bearing coarse sandstone_2 | 2560 | 2.95 | 19.05 | 7.59 | 7.43 | 41.4 | 1.3 |
Coarse sandstone | 2580 | 7.05 | 29.07 | 9.57 | 7.43 | 41.4 | 2 |
Gravel bearing coarse sandstone_3 | 2550 | 2.12 | 19.05 | 7.59 | 7.43 | 41.4 | 1.3 |
5_1 coal seam | 1430 | 11.70 | 3.84 | 1.72 | 5.94 | 31.8 | 0.5 |
Mudstone_2 | 2530 | 1.65 | 3.91 | 2.76 | 12.77 | 30.4 | 0.55 |
5_1 coal seam | 1450 | 1.15 | 3.84 | 1.72 | 5.94 | 31.8 | 0.5 |
Silty mudstone | 2540 | 5.60 | 8.23 | 5.81 | 12.86 | 30.4 | 0.75 |
