Similar Simulation Test on Deformation Characteristics of Overlying Rock Developed by Instability of Strip Coal Pillar

Table 2

Similar material ratios for different layers of similar material models.

Rock stratum number	Lithology	Original layer thickness/(m)	Model thickness/(mm)	Matching number	Material proportioning and dosage (consider 30% loss/kg)					Laying thickness (mm)
					Sand	Calcium carbonate	Plaster	Water	Total
R-26	Clay	4.4	29.33	9 : 7 : 3	81.08	4.50	4.50	9.01	99.10	35
R-25	Coarse sand	1	6.67	9 : 5 : 5
R-24	Clay	5.5	36.67	9 : 7 : 3	81.08	6.31	2.70	9.01	99.10	35
R-23	Coarse sand	4.1	27.33	9 : 5 : 5	69.50	3.86	3.86	7.72	84.94	30
R-22	Loam	2.5	16.67	9 : 6 : 4	34.75	2.32	1.54	3.86	42.47	15
R-21	Coarse sand	17.5	116.67	9 : 5 : 5	277.99	15.44	15.44	30.89	339.77	120
R-20	Clay	6	40.00	9 : 7 : 3	92.66	7.21	3.09	10.30	113.26	40
R-19	Coarse sand	2.4	16.00	9 : 5 : 5	34.75	1.93	1.93	3.86	42.47	15
R-18	Clay	3.2	21.33	9 : 7 : 3	46.33	3.60	1.54	5.15	56.63	20
R-17	Coarse sand	19	126.67	9 : 5 : 5	289.58	16.09	16.09	32.18	353.93	125
R-16	Clay	9.4	62.67	9 : 7 : 3	139.00	10.81	4.63	15.44	169.88	60
R-15	Coarse sand	2.1	14.00	9 : 5 : 5	34.75	1.93	1.93	3.86	42.47	15
R-14	Loam	9.5	63.33	9 : 6 : 4	139.00	9.27	6.18	15.44	169.88	60
R-13	Siltstone	8.9	59.33	7 : 5 : 5	144.14	10.30	10.30	16.47	181.21	60
R-12	Fine grained sandstone	1.2	8.00	7 : 8 : 2	264.26	26.43	11.33	30.20	332.22	110
R-11	Medium grained sandstone	15.4	102.67	7 : 7 : 3
R-10	Mudstone	6.2	41.33	8 : 6 : 4	91.52	6.86	4.58	10.30	113.26	40
R-9	Medium grained sandstone	2.2	14.67	7 : 7 : 3	36.04	3.60	1.54	4.12	45.30	15
R-8	Mudstone	1.5	10.00	8 : 6 : 4	60.06	6.86	1.72	6.86	75.50	25
R-7	Fine grained sandstone	2	13.33	7 : 8 : 2
R-6	Siltstone	1.7	11.33	7 : 5 : 5	57.20	4.29	2.86	6.44	70.79	25
R-5	Mudstone	2.2	14.67	8 : 6 : 4
R-4	Siltstone	7.4	49.33	7 : 5 : 5	120.12	8.58	8.58	13.73	151.01	50
R-3	Fine grained sandstone	5.44	36.27	7 : 8 : 2	84.08	9.61	2.40	9.61	105.71	35
R-2	Medium grained sandstone	2.4	16.00	7 : 7 : 3	48.05	4.80	2.06	5.49	60.40	20
R-1	Siltstone	8.47	56.47	7 : 5 : 5	132.13	9.44	9.44	15.10	166.11	55
	3 coal loading	6	40.00	9 : 6 : 4	83.40	5.56	3.71	9.27	101.93	40
F-01	Mudstone	3.33	22.20	8 : 6 : 4	45.76	3.43	2.29	5.15	56.63	20
F-02	Siltstone	6.6	44.00	7 : 5 : 5	108.11	7.72	7.72	12.36	135.91	45
F-03	Medium grained sandstone	38.67	257.80	7 : 7 : 3	624.62	62.46	26.77	71.39	785.24	260
Total					3219.96	253.22	158.73	363.19	3995.11	1370