Research Article
Application of High-Strength Lightweight Concrete in Gob-Side Entry Retaining in Inclined Coal Seam
Table 7
Mechanics parameters of coal and rock mass.
| | Lithology | Modulus of elasticity (GPa) | Shear modulus (GPa) | Cohesion (MPa) | Friction angle (°) | Density (kg/m3) |
| | Siltstone | 11.2 | 7.6 | 3.2 | 32 | 2600 | | Mudstone | 8 | 4.8 | 2.3 | 30 | 2400 | | Sandy mudstone | 9.05 | 6.2 | 2.8 | 32 | 2500 | | Coal | 5 | 2.31 | 1.0 | 28 | 1300 | | Medium sandstone | 13.1 | 9.02 | 4.4 | 35 | 2600 | | Goaf | 0.20 | 0.15 | 0.001 | 5 | 1900 | | C40 concrete | 18 | 11.61 | 3.1 | 35 | 2400 | | C50 concrete | 18.6 | 11.96 | 3.6 | 37 | 2450 | | C60 concrete | 19.7 | 12.78 | 4.1 | 40 | 2600 | | LC50 concrete | 16.4 | 10.9 | 3.8 | 40 | 2042 |
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