Study on the Technology of Enhancing Permeability by Millisecond Blasting in Sanyuan Coal Mine

Table 1

Rock material parameters.

Name	Coal rock density	Elastic modulus	Poisson’s ratio	Tensile strength	Compressive strength	Cohesion	Internal friction angle
Value	1.42	0.855	0.323	1.909	10.848	1.142	40
	g/cm	GPa		MPa	MPa	MPa	°