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

Table 1

Mechanical parameters of microdielectric materials.

Materials	Homogeneity	Elasticity modulus /GPa	Compressive strength /MPa	Poisson ratio	Frictional angle (°)	C/T
Shale matrix	3	51.6	145	0.22	35	14
Calcite mineral	5	80.5	101	0.30	30	11
Quartz mineral	8	96	373	0.08	60	15