Experimental Study on Deformation Law of Rectangular Roadway in Horizontal Layered Rock Mass

Table 3

Loading scheme of model experiment.

Load level	Simulated depth (m)	Applied pressure (MPa)		Horizontal pressure coefficient	Duration (mins)	Cumulative duration (mins)
		Vertical	Horizontal
1	70	0.2	0.2	1	30	1–30
2	140	0.4	0.4	1	30	31–60
3	210	0.6	0.6	1	30	61–90
4	280	0.8	0.8	1	30	91–120
5	350	1.0	0.8	0.8	30	121–150
6	420	1.2	0.8	0.67	30	151–180
7	490	1.4	0.8	0.57	30	181–210
8	560	1.6	0.8	0.5	30	211–240
9	630	1.8	0.8	0.44	30	241–270
10	700	2.0	0.8	0.4	30	271–300
11	770	2.2	0.8	0.36	30	301–330
12	840	2.4	0.8	0.33	30	331–360
13	910	2.6	0.8	0.31	30	361–390
14	1000	2.8	0.8	0.29	30	391–420
15	1000	2.8	1.2	0.43	15	421–435
16	1000	2.8	1.6	0.57	15	436–450
17	1000	2.8	2.0	0.71	15	451–465
18	1000	2.8	2.4	0.86	15	466–480
19	1000	2.8	2.8	1	15	481–495
20	1000	2.8	3.2	1.07	15	496–510
21	1000	2.8	3.6	1.29	15	511–525
22	1000	2.8	4.0	1.43	15	526–540
23	1000	2.8	4.4	1.57	10	541–550