Investigation of Anisotropic Behavior and Statistical Evolution of Acoustic Emission Energy during the Deformation of Layered Sandstone

Table 1

Mechanical parameters of selected samples (units: °, MPa, %, and GPa).

Specimen number	(°)	Peak strength (MPa)		Peak strain (%)		Elastic modulus (GPa)		Specimen type
		Measured value	Mean value	Measured value	Mean value	Measured value	Mean value
A-1	—	124.4	126.3	0.97	0.98	17.3	16.6	Intact specimen
A-2	—	127.4		1.00		16.2
A-3	—	127.0		0.97		16.3
B-1	20	111.5	106.2	1.08	1.02	14.2	14.6	Layered specimen
B-2	20	101.7		1.00		14.3
B-3	20	105.4		0.97		15.4
C-1	80	92.8	85.7	1.02	0.94	13.2	13.5
C-2	80	66.7		0.85		13.3
C-3	80	97.7		0.95		14.0