Experimental Investigation on Long-Term Strength and Acoustic Emission Characteristics of Coal Pillar under Inclined Compression Loading

Table 2

The LTS of coal specimens at different inclination angles.

Inclination angles		Long-term strength (MPa)	Average value (MPa)	Absolute deviation (MPa)	Relative deviation (%)	Standard deviation (MPa)	Relative standard deviation (%)
0°	1#	9.53	9.58	0.05	0.52	0.04	0.42
	2#	9.61		0.03	0.31
	3#	9.59		0.01	0.10
5°	1#	5.71	5.69	0.02	0.35	0.067	1.18
	2#	5.75		0.06	1.04
	3#	5.62		0.07	1.25
10°	1#	4.7	4.65	0.05	1.06	0.06	1.29
	2#	4.58		0.07	1.53
	3#	4.66		0.01	0.21
15°	1#	3.69	3.66	0.03	0.81	0.08	2.18
	2#	3.57		0.09	2.52
	3#	3.73		0.07	1.88
20°	1#	2.97	2.96	0.01	0.34	0.02	0.67
	2#	2.94		0.02	0.68
	3#	2.98		0.02	0.67