Abstract:

When advancing in hard rock roadway, compared with conventional blasting, the shaped charge blasting technique could get more ideal blasting effect on the premise of saving blasting material. In this paper, according to the geological and construction conditions of rock roadway with large section in Fourth Mine of Pingdingshan Coal Co.,LTD, and based on the principle of shaped charge blasting technique, we designed new blasting parameters on the original conventional blasting parameters. The shaped charge blasting engineering practice showed that, compared with original parameters, the new parameters could increase the footage by 15% and reduce the amount of overbreak and underbreak on roadway surrounding rock by 50% and save the cost by 20%, and achieve good technology economic results.

Key words: large section, hard rock roadway, shaped charge blasting, parameter optimization