Research Article
Overlying Strata Movement and Abutment Pressure Evolution Process of Fully Mechanized Top Coal Caving Mining in Extra Thick Coal Seam
Table. 2
Joint mechanical parameters of coal and rock.
| | Lithology | Normal stiffness | Shear stiffness | Shear modulus | Bulk modulus | Cohesion | Internal friction angle | Tensile strength | | (GPa) | (GPa) | (GPa) | (GPa) | (MPa) | (°) | (MPa) |
| | Overlying strata 2 | 4.1 | 2.3 | 7.1 | 8.1 | 10.5 | 33.3 | 3.2 | | Medium coarse sandstone | 5.2 | 2.9 | 10.2 | 15.3 | 26.5 | 35.4 | 5.8 | | Overlying strata 1 | 3.8 | 2.1 | 8.3 | 8.9 | 11.9 | 28.1 | 3.3 | | Medium coarse sandstone | 5.2 | 2.9 | 10.2 | 15.3 | 26.5 | 35.4 | 5.8 | | Siltstone | 4.8 | 2.6 | 9.8 | 12.1 | 15.5 | 33.2 | 4.3 | | Carbonaceous mudstone | 2.6 | 1.4 | 2.8 | 3.6 | 10.8 | 28.1 | 3.8 | | Coal seam | 2.2 | 1.2 | 1.7 | 2.2 | 5.9 | 15.3 | 1.3 | | Carbonaceous mudstone | 3.6 | 1.7 | 2.8 | 3.6 | 10.8 | 28.1 | 3.8 | | Siltstone | 5.6 | 2.8 | 8.2 | 10.3 | 7.2 | 34.8 | 3.7 |
|
|
