Table 1 Correspondence table of impact ground pressure accidents and load three-band state.
Date | Load three-zone pattern | Two-sided displacement/mm | Bottom drum /mm | Roof damage pattern | Roadway damage length/m |
---|---|---|---|---|---|
2014.9.5 | Degenerate three-band structure | 200 | 150 | Roof convergence | 38 |
2014.9.14 | Degenerate three-band structure | – | – | Roof convergence | 50 |
2015.1.9 | Complete three-band structure | ≥ 1000 | > 2000 | Roof falling | 155 |