Determining the Height of Water-Flowing Fractured Zone in Bedrock-Soil Layer in a Jurassic Coalfield in Northern Shaanxi, China

Table 1

Material matching scheme of the physical simulation model for 5⁻² coal seam mining in Zhangjiamao coal mine.

No.	Lithology	Accumulated thickness of the original rock (m)	Thickness of the original rock (m)	Thickness of \the model (cm)	Accumulated thickness of the model (cm)	Sand (g/cm)	Gypsum (g/cm)	Big white powder (g/cm)
19	Loess	48.16	48.16	40.13	124.90	—	—	—
18	Medium grained sandstone	52.56	4.4	3.67	84.77	8640	288	672
17	Fine grained sandstone	55.43	2.87	2.39	81.10	7680	384	1536
16	Medium grained sandstone	56.7	1.27	1.06	78.71	8640	288	672
15	Siltstone	65.96	9.26	7.72	77.65	7680	384	1536
14	4^−3 coal seam	69.58	3.62	3.02	69.94	—	—	—
13	Siltstone	71.2	1.62	1.35	66.92	7680	192	1728
12	Siltstone	72.14	0.94	0.78	65.57	8640	288	672
11	4^−4 coal seam	73.05	0.91	0.76	64.79	—	—	—
10	Siltstone	75.4	2.35	1.96	64.03	8640	384	576
9	Fine grained sandstone	82.8	7.4	6.17	62.07	7680	384	1536
8	Siltstone	93.6	10.8	9.00	55.90	7680	576	1344
7	Fine grained sandstone	96	2.4	2.00	46.90	8640	384	576
6	Fine grained sandstone	104.8	8.8	7.33	44.90	7680	576	1344
5	Siltstone	113.35	8.55	7.13	37.57	7680	384	1536
4	Siltstone	127.5	14.15	11.79	30.45	7680	576	1344
3	Fine grained sandstone	129.6	2.1	1.75	18.65	7680	384	1536
2	Siltstone	144.28	14.68	12.23	16.90	7680	576	1344
1	5^−2 coal seam	149.88	5.6	4.67	4.67	—	—	—