Table 3 Microscopic parameters of different rock strata and support elements in the numerical model.
Model properties | \(\:{E}^{*}(\)GPa) | \(\:{k}_{n}/{k}_{s}\) | \(\:\mu\:\) | \(\:\rho\:\) (kg/m3) | \(\:\overline{{E}^{*}}(\)GPa) | \(\:\overline{{k}_{n}}/\overline{{k}_{s}}\) | \(\:\overline{{\sigma\:}_{c}}(\)MPa) | \(\:\overline{{\tau\:}_{c}}\)(MPa) | \(\:\overline{\varphi\:}\)/(°) |
|---|---|---|---|---|---|---|---|---|---|
Roof(sandstone) | 3.5 | 1.2 | 0.6 | 2570 | 3.5 | 1.2 | 37.6 | 61.5 | 35 |
coal | 1.3 | 1.2 | 0.6 | 1350 | 1.3 | 1.2 | 16.6 | 10 | 35 |
Floor(mudstone) | 2 | 1.2 | 0.62 | 2500 | 2 | 1.2 | 22.6 | 21 | 25 |
Support | 300 | 1.25 | 0.85 | 7850 | 300 | 1.25 | 500 | 250 | 40 |
Support-surrounding rock | / | / | / | / | 100 | 1.25 | 70 | 40 | 36 |
