Study on the Mechanism and Control of Rock Burst of Coal Pillar under Complex Conditions
Table 3
Experiment ratio.
No.
Lithology
Simulated thickness (cm)
Material proportion
Sand (kg)
Gypsum (kg)
Flour (kg)
1
Mudstone
40 : 3 : 7
13.87
0.52
1.21
2
Sandy mudstone
6
20 : 1 : 4
13.6
0.34
1.36
3
Mudstone
5
40 : 3 : 7
13.87
0.52
1.21
4
Sandy mudstone
7
20 : 1 : 4
13.6
0.34
1.36
5
Sandstone
6
45 : 1 : 4
13.3
0.29
1.18
6
Sandy mudstone
4
20 : 1 : 4
13.6
0.34
1.36
7
Packsand
4
70 : 9 : 21
13.76
0.59
1.38
8
Mudstone
3
40 : 3 : 7
13.87
0.52
1.21
9
Sandy mudstone
7
20 : 1 : 4
13.6
0.34
1.36
10
Coarse sandstone
8
35 : 3 : 12
13.34
0.38
1.52
11
Sandy mudstone
4.5
20 : 1 : 4
13.6
0.34
1.36
12
Mudstone
4
20 : 1 : 4
13.6
0.34
1.36
13
Coarse sandstone
2.5
35 : 3 : 12
13.34
0.38
1.52
14
Coal seam B4-1
1.5
20 : 20 : 1 : 1.5
5.085
0.254
1.272
15
Mudstone
4
40 : 3 : 7
13.87
0.52
1.21
16
Coarse sandstone
7
35 : 3 : 12
13.34
0.38
1.52
17
Coal seam B3
0.9
20 : 20 : 1 : 1.5
3.39
0.169
0.848
18
Mudstone
1.5
40 : 3 : 7
20.81
0.78
1.82
19
Packsand
8
70 : 9 : 21
13.76
0.59
1.38
20
Coal seam B2
4.75
20 : 20 : 1 : 1.5
4.28
0.22
1.07
21
Mudstone
2
837
13.87
0.52
1.21
22
Packsand
70 : 9 : 21
536
23
54
Note: the top and bottom thickness of the model have different thickness with the change of dip angle. The material proportion of rock is aggregate : gypsum : flour. The material proportion of coal seam is aggregate : gypsum : flour : pulverized coal.
