Research Article
Study on Reasonable Chain Pillar Size in a Thick Coal Seam
Table 1
Measurement results of rock mechanical parameters.
| Lithology | Compressive strength/MPa | Shear strength/MPa | Tensile strength/MPa | Poisson ratio | Cohesion/MPa | Friction/° |
| Silty mudstone | 11.3 | 29 | 1.8 | 0.29 | 6.8 | 35 | Fine sandstone | 50.9 | 86.7 | 2.8 | 0.24 | 13.2 | 49 | Pelitic siltstone | 30.4 | 50.4 | 2.2 | 0.28 | 11.1 | 36 | Coal | 5.8 | 9.1 | 1.4 | 0.32 | 3.4 | 29 | Mudstone | 9.7 | 21.1 | 1.59 | 0.3 | 5.3 | 32 | Medium fine sandstone | 46.4 | 39.5 | 2.7 | 0.26 | 11.7 | 46 |
|
|