The Structure Design of Slit-Charge for Directional Fracture Controlled Blasting in Stone Drifting

Abstract

Slit-charge for directional fracture controlled blasting technology has demonstrated the clear superiority in stone drifting in coal mines. However, the slit-charge has not yet been molded products, which limited its application to further promotion. Structural parameter optimization for slit-charge using orthogonal experimental design method was carried out. The slit-charge blasting in Lead column performed, the slit-charge blasting primary and secondary influencing factors were obtained by using range analysis; Range analysis methods were applied to analyze the sensitivity of these factors and coupling influences. Structural parameters of slit-charge were determined according to effect curves. This product is easy to use and significant effect in the field. All of half blast-hole trace ratios are more than 90%, the driving speed could be highly increased．Contour shape of roadway is in good condition to avoid rockfalls and rockslides. Overbreak can be costly. Theoretical results are translated into technology, and technological achievements into products.