Propagation Characteristics of Explosion Wave and Explosion Gas in Blast-Hole

Abstract

In order to explore the propagation characteristics of explosion wave and gas in blast-hole, design a model to simulate blast-hole charge in the laboratory, adopted a high-speed schlieren experiment system used to study the evolution characteristics of explosion wave field under two kinds of charge structures. The results showed similar explosion wave velocities for the two cartridges, the explosion wave was reflected when it reaches the hole wall, and the reflected wave velocity was lower than an incident wave. The explosion gas tends to cluster and spread in a cutting direction, resulting in intensified destruction in that direction. The explosion wave first emerges in the direction of the slits, and then moves towards the blast-hole walls, which indicates that the explosion energy can be accumulated in the slit direction and cause directional destruction of the medium. To study this process in detail, establish numerical model for the propagation of explosive in the hole. The results indicated that the detonation products first come out in the direction of the slits and then go around towards other areas in a distribution that is consistent with the observations by high-speed schlieren photography.

Optimization of Blasting Parameters Considering Both Vibration Reduction and Profile Control: A Case Study in a Mountain Hard Rock Tunnel

“…The shock wave energy mainly presents as radial and tangential stress wave energy when transmitted to the rock mass, and the vibration caused by blasting is the result of these waves acting on rock strata. This type of stress wave causes a negative effect of attenuation as the distance from the blasting source increases within a certain range of blasting construction [2,3]. Therefore, this is the most common and major hazard that occurs during blasting-blasting vibration disasters.…”