Table 2:
Experimental conditions.
Influencing factor
Coal sample number
X
/
Y
/
Z
axial stress/MPa
Unloading rate (mm·min
−1
)
Loading rate (mm·min
−1
)
RURLR
RURLR
G
20/20/20
0.56
1.5
0.4
I
20/20/20
0.97
2
0.5
H
20/20/20
0.84
1.5
0.6
K
20/20/20
1.09
2
0.5
L
20/20/20
1.18
1.5
0.8
J
20/20/20
0.98
1
1.0
B
20/20/20
1.08
1
1.1
A
20/20/20
0.77
0.5
1.5
C
20/20/20
0.85
0.5
1.7
D
20/20/20
0.72
0.25
2.9
E
20/20/20
0.80
0.25
3.2
Initial loading lateral stress
O
20/10/20
0.83
1.5
0.6
H
20/20/20
0.84
1.5
0.6
P
20/40/20
0.84
1.5
0.6
Initial unloading lateral stress
F
20/20/10
0.83
1.5
0.6
H
20/20/20
0.84
1.5
0.6
Q
20/20/40
0.83
1.5
0.6
Initial fixed lateral stress
S
10/20/20
1.15
1.5
0.8
L
20/20/20
1.18
1.5
0.8
R
40/20/20
1.13
1.5
0.8