Exploration of Reliability of Nonel Tube Firing in Hole based on High-speed Photography
Li Yin · Blasting · 2014
The Nonel tube misfired many times in the pile blasting at V area Hua Guoyuan in Guiyang city. In order to reduce misfire and to improve the firing reliability,the Nonel tube performance of explosion transference was studied. Firstly,the stable prorogation velocity of None with 1650 m / s was measured by high-speed photography.Then the cutting seam test of tube was performed,and when the cutting seam length was more than 12 cm,misfire happened in detonating tube. Furthermore,the critical velocity causing misfire was 525 m / s. Finally,water injection into tube more than 2 mm would induce misfire. When the Nonel tube was damaged by wrong operation in construction in the pile with water,the misfire rate was higher,where the cutting seam was induced factors and water the dominant factor. In the process of construction,all the measures such as reducing the water and ensuring the tube integrity could effectively reduce the misfire rate.