Influence of Charge Hole Spacing on the Crack Propagation Behavior under the Effect of Empty-Hole Directional Blasting

Table 1

Physical and mechanical parameters of rock.

Kinds of rock	Density (kN/m^3)	Compressive strength (MPa)	Tensile strength (MPa)	Elasticity moduli (10^4 MPa)	Poisson ratio
Sandstone	24.20	48.26	4.00	3.75	0.27