Table 1 Actual measured parameters of 3 − 1 coal measure strata.
From: Rock burst mechanisms induced by dynamic and static loading under composite key strata: a case study
Lithology | Density (kg/m3) | Uniaxial compressive strength (MPa) | Tensile strength (MPa) | Elasticity modulus (GPa) |
|---|---|---|---|---|
Sandy mudstone | 2600 | 47.60 | 3.6 | 9.0 |
Fine-grained sandstone | 2250 | 22.77 | 2.2 | 3.8 |
Coarse-grained sandstone | 2310 | 21.8 | 2.0 | 3.5 |
Siltstone | 2360 | 29.24 | 2.7 | 7.2 |
Middle-grained sandstone | 2300 | 22.57 | 1.6 | 3.4 |
Coal | 1320 | 29.56 | 1.9 | 2.1 |
