Table 3 Strain softening model parameter settings.
Rock layer | Lithology | The cumulative plastic shear strain value | Internal friction angle (°) | Cohesion (MPa) |
|---|---|---|---|---|
Floor | Sandy Mudstone 1 | 0 | 38 | 3.2 |
0.05 | 36 | 2.7 | ||
0.1 | 34 | 2.2 | ||
Coal | Coal 3 | 0 | 38 | 2.7 |
0.05 | 36 | 2.3 | ||
0.1 | 34 | 1.9 | ||
Roof | Fine Sandstone 2 | 0 | 40 | 5.6 |
0.05 | 37 | 5.0 | ||
0.1 | 34 | 4.4 | ||
Medium Sandstone | 0 | 42 | 7.3 | |
0.05 | 40 | 6.5 | ||
0.1 | 38 | 5.7 |
