Design of Deep-hole Loose Blasting Scheme in Hard-rock Roadway Excavation Face

Both blasting driving and fully-mechanized excavating were slow and expensive in hard-rock roadway of Gucheng Coal Mine. Therefore, we proposed deep-hole loose blasting technology cooperated with comprehensive tunneling machine. Through the comparison and analysis of the arrangement forms of the straight line three-hole and the triangular three-hole, the numerical simulation was applied to obtain reasonable deep-hole loose blasting scheme. On the basis of this, the parameters of deep-hole loose blasting were designed and tested. The research results showed that loose blasting effect of the triangular was better than that of the straight line, the fracture expansion of rock mass was obvious and beneficial to tunnel; the fracture development was obvious in the 1.0 m to 1.2 m range of radial charging segment of blasting hole; after blasting, the tunneling speed of deep-hole loose blasting technology cooperated with fully-mechanized excavator is about 36% higher than that of blasting tunneling, which is about 120% higher than that of fully-mechanized excavator, and the average cutting consumption decreased by 39.3%.