Study on the Microscopic Fracture Process and Acoustic Emission of Shale Based on Digital Image

Table 2

Uniaxial compression test data of the Niutitang shale at different angles.

/(°)	/MPa	/10^-3	/MPa	/10^-3	/MPa	/10^-3
0	22.69	0.97	23.03	1.00	10.39	1.47	0.49	1.17	1.66
15	20.66	0.86	23.55	1.02	9.87	1.40	0.78	1.56	2.34
30	21.73	0.92	22.60	0.99	11.75	1.32	0.54	1.44	1.98
45	20.03	0.84	22.22	0.96	10.37	1.45	0.79	1.04	1.83
60	21.50	0.91	22.03	0.95	8.82	1.49	0.57	1.05	1.63
75	21.81	0.95	21.84	0.96	9.94	1.49	0.13	0.99	1.12
90	22.33	0.97	22.81	1.01	9.81	1.48	0.53	1.22	1.75