Table 3 Mechanical parameters of UDEC numerical model.
From: Rock burst mechanisms induced by dynamic and static loading under composite key strata: a case study
Lithology | Matrix properties | Joint parameters | ||||||
|---|---|---|---|---|---|---|---|---|
Em(GPa) | Poisson’s ratio | RQD | kn (GPa) | ks (GPa) | Cohesion (MPa) | Internal friction angle (°) | Tensile strength (MPa) | |
Sandy mudstone | 5.9 | 0.32 | 93 | 28.3 | 9.9 | 4.1 | 33 | 3.8 |
Fine-grained sandstone | 2.2 | 0.28 | 90 | 9.7 | 3.4 | 2.4 | 27 | 1.7 |
Medium-grained sandstone | 2.0 | 0.28 | 90 | 8.7 | 3.1 | 2.6 | 27 | 1.7 |
Coal | 0.7 | 0.21 | 76 | 2.1 | 0.71 | 1.2 | 24 | 1.6 |
