Study on dynamite charge in rapid excavation by blasting

Blasting technology is the common driving methods, in order to improve the speed of excavation, and the driving quality of roadway, normally in the course of blasting the around eyes should be a low detonation velocity, low density, high sensitivity, high-explosive detonation stable, and low-power explosive. In engineering practice, after the cut holes blasting explosive charges, only the top broken rocks of the department were thrown, while the remaining compression cylindrical charge only have exerted effects, less energy for the rock throwing, so the larger part of the still stuck remained in the groove, the reason is that dynamite charge did not explode generate sufficient amount of gases. About throwing effects, are generally considered by detonation, shock wave and stress wave interaction, in which the most significant effect were expansion effect and the gas of explosion generated. By some experiments, the results showing that explosives and gunpowder joint charges compare with dynamite charge has a significant difference. Firstly, joint charges is a kind of detonator sensitivity of low detonation velocity, low power explosives, the project would be conducted without the help of the air interval charge to achieve the detonating effect, and it will charge directly; Secondly, the joint charges of the detonation gases volume are greater than dynamite charge, markedly enhanced air wedge effect, and the crushing effect has also improved, so to the rapid blasting excavation charge, it will provide a reasonable basis.