Influences of True Triaxial Loading-Unloading Stress Paths on Mechanical Properties and Wave Velocity of Coal Samples subject to Risk of Rock Burst

Table 1

The effect test of RURLR and initial stress.

Test content	Initial stress (MPa)	Loading rate (Y-axis) (mm/min)	Unloading rate (Z-axis) (mm/min)	RURLR
RURLR	25	1	0.5	0.5
			1	1
			1.5	1.5
			2	2
			2.5	2.5
Initial stress	6.25	1	1.5	1.5
	12.5
	18.75
	25
	31.25