Use of Acoustic Emission for the Detection of Brittle Rock Failure under Various Loading Rates

Table 1

Grouping of the sandstone samples.

Group number	Sample number	Mass (kg)	Height (mm)	Diameter (mm)	Longitudinal wave velocity (km/s)	Loading rate (mm/min)
Group 1	#2	0.53	101.4	49.25	4.67	0.03
	#3	0.53	101.3	49.18	4.67	0.05
	#6	0.53	102	49.15	4.67	0.07
	#7	0.53	101.5	49.38	4.67	0.09
Group 2	#1	0.52	100.1	48.88	4.67	0.03
	#5	0.52	100.4	48.65	4.67	0.05
	#8	0.52	100.3	48.81	4.67	0.07
	#9	0.52	100.8	48.55	4.67	0.09