Research Article
Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China
Table 4
Mechanical parameters of structure plane between blocks.
| | Rock strata | Normal stiffness (GPa) | Shear stiffness (GPa) | Tensile strength (MPa) | Friction angle (°) | Cohesion (MPa) |
| | Conglomerate | 12.0 | 15.0 | 6.14 | 10 | 7.0 | | Fine sandstone | 5.0 | 5.0 | 4.10 | 8 | 4.5 | | Conglomerate | 12.0 | 15.0 | 6.14 | 10 | 6.4 | | Fine sandstone | 4.0 | 5.0 | 4.10 | 8 | 4.5 | | Siltstone | 4.0 | 4.0 | 3.61 | 8 | 4.4 | | Mudstone | 1.6 | 4.8 | 1.30 | 7 | 2.2 | | Fine sandstone | 5.0 | 5.0 | 4.10 | 8 | 5.5 | | Mudstone | 1.6 | 4.8 | 1.30 | 7 | 2.2 | | Coal seam | 1.4 | 1.2 | 1.02 | 6 | 1.3 | | Siltstone | 5.0 | 5.0 | 4.10 | 8 | 4.5 |
|
|
