Table 10 Prediction of rockburst hazard at different locations of the tunnel and comparison of the actual situation.
Location | Maximum energy density U (MJ/m³) | Energy storage limits Ulim (MJ/m³) | Umix | Rockburst level determined based on Umix | Rockburst situation in the tunnel |
|---|---|---|---|---|---|
Vault | 0.2051 | 0.8105 | 0.283 | (No rockburst) | No rockburst |
Arched waist | 0.3857 | 0.8105 | 0.476 | (Moderate rockburst) | Moderate rockburst |
Sidewall | 0.3906 | 0.8105 | 0.482 | (Moderate rockburst) | Moderate rockburst |
Tunnel face | 0.2885 | 0.8105 | 0.356 | (Minor rockburst) | Minor rockburst |
