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