Table 2: Experimental conditions.

Influencing factorCoal sample numberX/Y/Z axial stress/MPaUnloading rate (mm·min−1)Loading rate (mm·min−1)RURLR

RURLRG20/20/200.561.50.4
I20/20/200.9720.5
H20/20/200.841.50.6
K20/20/201.0920.5
L20/20/201.181.50.8
J20/20/200.9811.0
B20/20/201.0811.1
A20/20/200.770.51.5
C20/20/200.850.51.7
D20/20/200.720.252.9
E20/20/200.800.253.2

Initial loading lateral stressO20/10/200.831.50.6
H20/20/200.841.50.6
P20/40/200.841.50.6

Initial unloading lateral stressF20/20/100.831.50.6
H20/20/200.841.50.6
Q20/20/400.831.50.6

Initial fixed lateral stressS10/20/201.151.50.8
L20/20/201.181.50.8
R40/20/201.131.50.8