Research on the control technology of heavy layer hard roof blasting

In this paper, based on the typical geological features of heavey layer hard roof, around a blasting weakening control of complete sets of technology, through the theoretical calculation and numerical simulatio, analyses the rules of the thick layer of hard roof and the characteristic of mine pressure appear; Based on the theoretical analysis, the attenuation height of vertical blasting and the circular blasting distance are determined. By weakening roof blasting scheme design, pull cut blasting with two lane ahead of deep hole blasting weakening technology, this paper introduces hole arrangement, drilling tool, design parameters control and instrument. A complete set of technical measures to reduce the control of hard roof blasting in thick layer is formed, and the rationality of the technical measures is confirmed by field observation. The relevant research results have important practical significance and reference value to the hard roof management of similar geological conditions.