Lithology | Volume weight/N∙m−3 | Rock strata thickness/m | Elasticity modulus/GPa | Poisson’s ratio | Cohesion/ MPa | Internal friction angle/(˚) | Strength of extension/ MPa | Remark |
Key strata 2 | 25,000 | 8 | 60 | 0.4 | 40 | 40 | 7.0 | Thickness of stratification is 2 m |
Soft rock 2 | 25,000 | 8 | 10 | 0.3 | 30 | 30 | 1.0 | |
Key strata 1 | 25,000 | 8 | 60 | 0.4 | 40 | 40 | 7.0 | |
Soft rock 1 | 25,000 | 8 | 10 | 0.3 | 30 | 30 | 1.0 | |
Coal seam | 14,000 | 3 | 10 | 0.2 | 10 | 15 | 1.0 | |
Floor | 25,000 | 5 | 60 | 0.3 | 30 | 40 | 7.0 |