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

Table 1

Mechanical parameters of shale matrix and quartz minerals.

Material	Elastic modulus (GPa)	Compressive strength (MPa)	Poisson’s ratio	Pull ratio	Internal friction angle (°)
Shale	51.6	145	0.22	14	35
Quartz	96	373	0.08	15	60