Formation Mechanism and the Height of the Water-Conducting Fractured Zone Induced by Middle Deep Coal Seam Mining in a Sandy Region: A Case Study from the Xiaobaodang Coal Mine
Table 2
Parameters and the material ratio of the similar model.
Stratum
Model thickness (cm)
Proportioning mass (kg)
Simulation material ratio
Mass of simulated material (kg)
Sand
Gypsum
White powder
Sand
Gypsum
White powder
Soil layer
31
206
Mudstone
2
13
7
3
7
9.3
1.2
3.6
Fine sandstone
5
33
7
3
7
23.3
3.0
7.0
Siltstone
6
40
7
3
7
28.0
3.6
8.4
Medium sandstone
5
33
8
3
7
26.6
3.0
7.0
Mudstone
4
27
7
3
9
18.6
2.4
7.2
Fine sandstone
3
20
7
3
7
14.0
1.8
4.2
Medium sandstone
3
20
8
3
7
16.0
1.8
4.2
Siltstone
2
13
7
3
7
9.3
1.2
2.8
Mudstone
5
33
8
3
7
26.6
3.0
7.0
Siltstone
4
27
7
3
7
18.6
2.4
5.6
Fine sandstone
2
13
7
3
7
9.3
1.2
2.8
Sandy mudstone
2
13
7
2
8
9.3
0.8
3.2
Fine sandstone
8
53
7
3
7
37.3
4.8
11.2
Mudstone
4
27
8
3
7
21.3
2.4
5.6
Fine sandstone
2
13
7
3
7
9.3
1.2
2.8
Coarse sandstone
4
27
8
2
8
21.3
1.6
4.8
Fine sandstone
11
73
7
3
7
51.3
6.6
15.4
Mudstone
2
13
8
3
7
10.6
1.2
2.8
Siltstone
4
27
7
3
7
18.6
2.4
5.6
Siltstone
2
13
7
3
7
9.3
1.2
2.8
Fine sandstone
4
27
7
3
7
18.6
2.4
5.6
Siltstone
2
13
7
3
7
9.3
1.2
2.8
Mudstone
6
40
8
3
7
31.9
3.6
8.4
Siltstone
5
33
7
3
7
23.3
3.0
7.0
2−2 coal seam
2.5
20
Siltstone
8
53
7
3
7
37.3
4.8
11.2
Fine sandstone
7
47
7
3
7
32.6
4.2
9.8
3−1 coal seam
1.5
10
Siltstone
2.5
17
7
3
7
11.6
1.5
3.5
Note: the ratio of coal seam: river sand: gypsum : white powder = 26 : 1:5 : 15; the ratio of the loose layer in river sand : loess = 6 : 4.
