Application and Development of an Environmentally Friendly Blast Hole Plug for Underground Coal Mines
Table 3
Physical and mechanical parameters of different samples under impact load.
Sample
L (cm)
(kg/m3)
P (MPa)
(J)
t (ms)
EL (cm)
TL (cm)
WL (cm)
Remarks
A1
28.0
918
0.5
119.91
2.82
2.4
0.4
2.0
A2
28.4
918
0.6
177.48
7.00
2.5
0.3
2.2
A3
27.8
918
0.7
202.01
8.44
3.5
0.3
3.2
A4
27.9
918
0.8
248.23
8.78
5.3
0.5
4.8
A5
27.9
918
0.9
282.90
9.66
6.7
0.6
6.1
A6
27.9
918
0.9
275.45
7.98
8.5
1.0
7.5
A7
28.2
918
1.0
307.97
9.98
8.2
0.4
7.8
A8
28.2
918
1.1
353.90
11.08
10.9
1.2
9.7
A9
27.8
918
1.2
411.51
16.08
14.6
—
—
Run out
A10
27.7
918
1.2
402.56
13.54
11.5
5.2
6.3
A11
27.8
918
1.3
510.66
15.00
15.4
—
—
Run out
A12
28.1
918
1.3
568.22
14.40
17.9
—
—
Run out
B1
27.5
1890
0.5
114.35
1.80
2.8
0.5
2.3
B2
28.0
1839
0.6
182.87
5.38
5.9
0.4
5.5
B3
27.1
1808
0.7
190.58
6.10
7.2
0.5
6.7
B4
26.9
1867
0.8
228.12
6.90
8.5
0.9
7.6
B5
27.8
1958
0.9
292.59
7.04
10.2
1.1
9.1
B6
28.2
1914
1.0
305.32
7.38
11.5
1.4
10.1
B7
28.4
1881
1.1
342.45
9.74
12.8
—
—
Run out
B8
28.1
1983
1.1
360.25
8.78
13.8
—
—
Run out
, nitrogen pressure; , impact incident energy; , motion time of sample in the hole; EL, end movement of the sample; TL, tail movement of the sample; and WL, compression deformation of the sample.
