Research Article
Numerical Analyses on Deformation and Failure Characteristics of Surrounding Rock of Gob-Side Entry Retention by Roof Cutting
Table 4
Parameter check process of blocks and joints.
| | Lithology | Block | Joint | | Density (kg/m3) | Modulus of elasticity (GPa) | Poisson’s ratio | Cohesion (MPa) | Friction angle (°) | Tensile strength (MPa) | Normal stiffness (GPa/m) | Shear stiffness (GPa/m) | Cohesion (MPa) | Friction angle (°) | Tensile strength (MPa) |
| | Fine sandstone | 2300 | 11.4 | 0.23 | 4.3 | 35 | 11 | 68 | 8 | 4.3 | 35 | 2.2 | | Medium sandstone | 2300 | 10.2 | 0.19 | 4.1 | 26 | 8 | 42 | 7 | 4.1 | 26 | 1.6 | | Siltstone | 2400 | 17.6 | 0.19 | 3.8 | 37 | 10 | 140 | 25 | 3.8 | 37 | 2 | | 2-2# coal | 1300 | 2.7 | 0.25 | 1.8 | 28 | 4.8 | 10.4 | 1.8 | 1.8 | 28 | 9.6 |
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