Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths

Table 2

Count rate of sandstone sample under various confining pressures in Schemes II and III.

Stress path	Confining pressure/MPa	Axial stress difference at the peak/MPa	Time at the peak/s	Count rate at the peak/(times/s)	Maximum count rate/(times/s)
Scheme II	10	110.67	74.9	131	131
	20	148.03	94.3	174	174
	40	186.03	122.6	211	211
	50	207.39	146.9	296	296
Scheme III	10	109.57	57.13	112	112
	20	152.31	72.3	159	159
	40	186.49	81.12	194	194
	50	218.74	92.4	241	241