Investigation on the Effect of Dynamic Frequency on Fracture Evolution in Preflawed Rock under Multistage Cyclic Loads: Insight from Acoustic Emission Monitoring

Table 1

Rock loading path description in the cyclic loading tests.

Group	Sample ID	()	Mass (g)	Peak strength (MPa)	Loading cycles	Loading frequency (Hz)	Lower limit stress (MPa)	Loading and unloading conditions
I	UC-1		540.6	70.26	—	—	—	Uniaxial, monotonous compression, 0.06 mm/min
	UC-2		540.3	73.09	—	—	—
II	GIAF-1		542.8	64.185	150	0.04	5	Uniaxial cyclic, dynamic loading, increasing amplitude stress of 10 MPa, 30 cycles were performed for each fatigue loading stage
	GIAF-2		540.6	63.125	141	0.04	5
	GIAF-3		543.8	65.846	162	0.10	5
	GIAF-4		543.1	64.534	160	0.10	5
	GIAF-5		536.4	65.761	177	0.50	5
	GIAF-6		537.8	65.557	174	0.50	5
	GIAF-7		533.2	73.428	190	1.00	5
	GIAF-8		536.8	75.126	192	1.00	5