Numerical Test Study of the Microscale Failure Modes and Fractal Analysis of Lower Cambrian Shale Based on Digital Images

Table 3

AE energy and fractal dimension values under different stress levels and different confining pressures.

Stress level
Confining pressure(MPa)		10%	20%	30%	40%	50%	60%	70%	80%	90%	100%
0	AE energy	0	0	0	0	0.0001	0.0013	0.0112	0.0562	0.3035	40.3338
	Ds	0	0	0	0.4752	0.6617	0.8330	1.2060	1.1880	1.3670	1.5130
2	AE energy	0	0	0	0.0001	0.002	0.0196	0.1532	1.2084	6.0286	64.1970
	Ds	0	0	0	0.5329	0.772	1.0020	1.2610	1.5000	1.5920	1.6770
4	AE energy	0	0	0	0	0.0012	0.0295	0.2413	1.5184	19.9760	108.7755
	Ds	0	0	0	0.4197	0.6455	1.0030	1.2640	1.506	1.7010	1.7840
6	AE energy	0	0	0	0	0.0020	0.0332	0.3025	2.1536	24.1428	154.0042
	Ds	0	0	0	0.4076	0.6360	0.9952	1.2820	1.5230	1.725	1.8350
8	AE energy	0	0	0	0	0	0.019	0.2106	1.7971	33.5573	279.7562
	Ds	0	0	0	0	0.4197	0.8818	1.2110	1.5040	1.7150	1.8930
10	AE energy	0	0	0	0	0.0006	0.0175	0.2069	1.7615	45.5702	377.1735
	Ds	0	0	0	0	0.5012	0.8274	1.1680	1.4850	1.7130	1.9210