Table 3 Mechanical parameters of different materials.
From: Back analysis of mechanical parameters based on GPSO-BP neural network and its application
Type | Density (kg/m3) | \(E\) \((\text{GPa})\) | \(\mu\) | \(\varphi\) \((^\circ )\) | \(c\) \((\text{MPa})\) |
|---|---|---|---|---|---|
Surrounding rock (to be inverted) | 2700 | 1–3.8 | 0.31–0.45 | 0.05–0.5 | 20 ~ 35 |
Initial support | 2500 | 33.3 | 0.3 | – | – |
Bolt | 7800 | 200 | 0.3 | – | – |
