Experimental Research on Acoustic Emission Characteristics and Felicity Effects during Coal Fatigue Failure under Cyclic Loading

Table 1

Coal sample size and test conditions.

Coal samples number		Conventional triaxial compression test			Triaxial cyclic loading test
		MA-1	MA-2	MA-3	MB-1	MB-2	MB-3	MB-4
Coal samples size	Diameter (mm)	50.02	50.00	50.01	50.01	50.02	50.01	50.00
	Height (mm)	100.01	100.01	100.02	100.00	100.02	100.01	100.01
Loading frequency (Hz)		—	—	—	0.25	0.5	0.25	0.5
Confining pressure (MPa)		10			10
Conventional triaxial compressive strength		56.84	55.37	60.21	—	—	—	—
Average compressive strength		57.47			—	—	—	—