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

Table 1

Count rate of sandstone sample under various confining pressures in Scheme I.

Scheme I	Confining pressure/MPa	Axial stress difference at the peak/MPa	Time at the peak/s	Count rate at the peak/(times/s)	Time of quiet period/s	Maximum count rate/(times/s)
	10	118.1	78.3	59	20	96
	20	154.1	93.4	100	22	140
	40	199.9	134.2	118	33	134
	50	210.60	184.0	145	57	169