Study on the Migration Law of Overlying Strata on the Working Surface of Large Mining Height in Y.C.W Coal Mine
Table 2
Material ratio table of similar simulation test of Y.C.W mine 130204 working face.
Number right
Lithology
Model bulk density (g/cm3)
Compressive strength of model (MPa)
Total thickness (cm)
Material ratio number
Total layered weight (kg)
16
Siltstone
1.63
0.07
4
855
1.97
15
Medium sandstone
1.56
0.06
21.5
755
10.14
14
Claystone
1.38
0.11
7.5
755
9.99
13
Fine sandstone
1.47
0.12
3.5
755
11.51
12
Claystone
1.38
0.11
3
755
10.05
11
Fine sandstone
1.47
0.12
3
855
10.25
10
Silty claystone
1.38
0.11
11
755
10.02
9
Medium sandstone
1.56
0.06
1
855
3.92
8
Grit sandstone (water)
1.47
0.08
25.5
755
14.86
7
One layer coal
0.94
0.04
0.5
873
2.09
6
Siltstone
1.63
0.07
1.5
855
6.3
5
Medium-grained sandstone
1.56
0.06
7.5
855
10.54
4
Fine sandstone
1.47
0.12
2
755
8.59
3
Siltstone
1.63
0.07
1
855
4.3
2
Two-layer coal
0.94
0.04
4
873
8.64
1
Silty claystone
1.38
0.11
7.5
755
10.85
Note: The material ratio number 873 indicates that the aggregate (sand) of the material accounts for 80%, the cement material accounts for 20%, and the cement material accounts for 70% lime and 30% gypsum.
