Table 3 Mechanical parameters of surrounding rock of roadway.
Name | Lithologic characters | Volumetric weight g/cm3 | Elastic modulus /GPa | Poisson ratio | Compressive strength /MPa | Softening index | Tensile strength /MPa | Cohesion /MPa | Angle of internal friction /(ο) |
|---|---|---|---|---|---|---|---|---|---|
Main roof | Siltstone | 2.48 | 4.57 | 0.21 | 20.9 | 0.76 | 3.11 | 3.75 | 27.5 |
Immediate roof | Siltstone | 2.53 | 4.41 | 0.19 | 16.7 | 0.74 | 3.52 | 3.18 | 28.9 |
Coal seam | No.5 coal seam | 1.43 | 3.20 | 0.22 | 6.45 | 0.86 | 0.21 | 1.30 | 32.0 |
Direct floor | Mudstone | 1.82 | 1.14 | 0.16 | 6.88 | 0.39 | 1.55 | 1.26 | 31.0 |
Hard floor | Limestone | 2.50 | 4.03 | 0.26 | 30.2 | 0.65 | 2.93 | 2.90 | 36.7 |
