Determining Tensile Strength of Rock by the Direct Tensile, Brazilian Splitting, and Three-Point Bending Methods: A Comparative Study

Table 1

Number of samples and main parameters for different rocks.

Lithology	Number of samples	Natural density, ρ0 (g.cm^−3)	Moisture content, (%)	Porosity, n (%)	Longitudinal wave velocity, (m/s)	Dynamic elastic modulus, Edt (GPa)
Granite	Cylinder: 5	2.619	0.03	2.09	4512	53.38
	Disc: 4
	Cuboid: 5
Marble	Cylinder: 6	2.835	0.11	2.03	4029	46.02
	Disc: 6
	Cuboid: 5
Diabase	Cylinder: 5	2.144	2.43	21.71	2406	12.45
	Disc: 4
	Cuboid: 4