Research Article
Experimental Investigation of Laws during Deformation of Circular Roadway in 10° Inclined Layered Rock
Table 3
The loading plan of the physical model experiment.
| Load level | Simulated depth | Lateral pressure coefficient | Oil pressure | Duration | The cumulative recording time | Top pressure/MPa | Lateral pressure/MPa |
| Preloading | | | 0.4 | 0.4 | 12 hours | 0 min |
| 1 | 200 m | 1 | 0.6 | 0.6 | Loading: 15 min Stabilization: 15 min | 15 min | 30 min |
| 2 | 400 m | 1 | 1.0 | 1.0 | Loading: 15 min Stabilization: 15 min | 45 min | 60 min |
| 3 | 600 m | 1 | 1.6 | 1.6 | Loading: 15 min Stabilization: 15 min | 75 min | 90 min |
| 4 | 800 m | 1 | 2.0 | 2.0 | Loading: 15 min Stabilization: 15 min | 105 min | 120 min |
| Excavation of the roadway | The first step | Excavation: 14 min Stabilization: 17 min | 134 min | 151 min | The second step | Excavation: 22 min Stabilization: 17 min | 173 min | 190 min | The third step | Excavation: 37 min Stabilization: 11 min | 227 min | 248 min | The fourth step | Excavation: 46 min Stabilization: 17 min | 294 min | 311 min | The fifth step | Excavation: 24 min Stabilization: 16 min | 335 min | 351 min |
| 5 | 800 | 1.2 | 2 | 2.4 | Loading: 17 min Stabilization: 13 min | 368 min | 381 min |
| 6 | 800 | 1.4 | 2 | 2.8 | Loading: 17 min Stabilization: 13 min | 398 min | 411 min |
| 7 | 800 | 1.6 | 2 | 3.2 | Loading: 17 min Stabilization: 13 min | 428 min | 441 min |
| 8 | 800 | 1.8 | 2 | 3.6 | Loading: 4 min | 445 min |
|
|