Failure Mechanism and Acoustic Emission Precursors of Coal Samples considering Bedding Effect under Triaxial Unloading Condition

Table 1

Experimental procedures.

Test categories	Loading type	Confining stress (MPa)	Unloading rate (MPa/s)	No.
TCST	V	10	—	V-S-1
TCST	V	10	—	V-S-2
TCST	V	10	—	V-S-3
TUT	V	10	0.05	V-X-1
TUT	V	10	0.05	V-X-2
TUT	V	10	0.05	V-X-3
TCST	T	10	—	T-S-1
TCST	T	10	—	T-S-2
TCST	T	10	—	T-S-3
TUT	T	10	0.05	T-X-1
TUT	T	10	0.05	T-X-2
TUT	T	10	0.05	T-X-3
TCST	P	10	—	P-S-1
TCST	P	10	—	P-S-2
TCST	P	10	—	P-S-3
TUT	P	10	0.05	P-X-1
TUT	P	10	0.05	P-X-2
TUT	P	10	0.05	P-X-3