Study on Mesoscale Damage Evolution Characteristics of Irregular Sandstone Particles Based on Digital Images and Fractal Theory

Table 1

Material parameters of a rock sample.

Material	Elastic modulus (GPa)	Compressive strength (MPa)	Poisson ratio	Compression-tension ratio	Internal friction angle (C°)
Sandstone	108.2	118	0.16	14	35
Calcite	80.5	101	0.30	10	30