Fracture Propagation and Hydraulic Properties of a Coal Floor Subjected to Thick-Seam Longwalling above a Highly Confined Aquifer

Table 1

Parameters and material ratio of the physical model.

No.	Lithology	Thickness (m)	Strength (MPa)		Simulated thickness (cm)	Quality (kg)
			Uniaxial compression	Uniaxial tension		Sand	Lime	Gypsum
1	Sandy mudstone	16	18.3	0.9	16	168	27.2	28.8
2	Siltstone	21	29.4	1.6	21	214.2	23.1	37.1
3	Mudstone	3	16.2	0.7	3	33.6	2.4	5.4
4	Sandy mudstone	9	18.3	0.9	9	94.5	15.3	16.2
5	Fine sandstone	3	37.6	2.1	3	34.5	4.5	4.5
6	Sandy mudstone	12	18.3	0.9	12	126	20.4	21.6
7	Mudstone	2	16.2	0.7	2	22.4	1.6	3.6
8	Sandy mudstone	16	18.3	0.9	16	168	27.2	28.8
9	Siltstone	3	29.4	1.6	3	30.6	3.3	5.3
10	Mudstone	4	16.2	0.7	4	44.8	3.2	7.2
11	Sandy mudstone	4	18.3	0.9	4	42	6.8	7.2
12	Carbonaceous mudstone	2	24.8	1.2	2	22.4	3.2	6.3
13	Aluminum-containing mudstone	5	26.9	1.4	5	54.5	3.2	6.2
14	Sandy mudstone	7	18.3	0.9	7	73.2	11.9	12.6
15	Siltstone	4	29.4	1.6	4	44.2	4.4	7.1
16	4# coal	6	10	0.6	6	61.8	10.8	11.3
17	Fine sandstone	6	37.6	2.1	6	69	9	9
18	Sandy mudstone	12	18.3	0.9	12	126	20.4	21.6
19	Fine sandstone	5	37.6	2.1	5	57.5	7.5	7.5
20	Coarse sandstone	14	47.8	3.5	14	144.6	30.8	31.2
21	L3 limestone	1	38.3	2.9	1	9.6	1.8	1.7
22	Fine sandstone	10	37.6	2.1	10	115	15	15
23	Siltstone	5	29.4	1.6	5	55.6	5.5	21.2
24	Medium sandstone	5	42.6	3.2	5	53.4	11	12.1
25	Mudstone	6	16.2	0.7	6	67.2	4.8	10.8
26	L2 limestone	6	38.3	2.9	6	57.6	10.8	10.5
27	Mudstone	8	16.2	0.7	8	89.6	6.4	14.4
28	L1 limestone	1	38.3	2.9	1	9.6	1.8	1.7
29	9# coal	14	10	0.6	14	144.2	25.2	26.4
30	Mudstone	7	16.2	0.7	7	78.4	5.6	12.6
31	Siltstone	9	29.4	1.6	9	93.4	9.9	21.2
32	Limestone	2	38.3	2.9	2	19.2	3.6	3.5
33	Fine sandstone	4	37.6	2.1	4	46	6	6
34	Limestone	3	38.3	2.9	3	28.8	5.4	5.3