Application study on directional fracture controlled blasting with shaped charge in rock

Based on dynamics of explosion and fracture mechanics, the mechanism of crack initiation and its expansion of directional fracture controlled blasting by shaped charge with wedge-type liners in rock were studied，the blasting parameters were designed and tested in field. The results show that the energy from blasting be directionally concentrated by the joint-cutting produced by cumulative jet. The directional expansion of crack is satisfactory, field test suggest that this blasting is a good means in excavating tunnels or cutting rock. It points out the aspects of this method need to be studied further. All these will give beneficial references to related theoretical study and field application.