Progressive Failure and Acoustic Emission Characteristics of Red Sandstone with Different Geometry Parallel Cracks under Uniaxial Compression Loading

Table 1

The main parameters of red sandstone.

Density		2.40 g/cm^3
Material		Original brittle rock from Junan County, Linyi City, China
Particle sizes		0.07–0.30 mm [24]
Uniaxial compressive strength	77.95 MPa	Specimen size: 50 mm (diameter) × 100 mm (height)
Tangent elastic modulus	6.55 GPa	Uniaxial compression loading tests under the ISRM standard
Uniaxial tensile strength	3.76 MPa	Specimen size: 50 mm (diameter) × 25 mm (height)
		Brazilian disc test under the ISRM standard