关键词: 岩巷掘进, 炮孔密度, 数码电子雷管, 掏槽爆破

Abstract: The density of shot holes in most projects in rock roadway driving is 5 per square meter,and the high number of holes restricts the efficiency of rock roadway driving to a certain extent. How to reduce the number of holes under the premise of ensuring the blasting efficiency has become an urgent problem to be solved. In this paper,relevant research is carried out from literature inspection method and field experiments. By sorting out relevant literature of coal mine and metal mine roadway excavation,several dimensions,such as section size,section area,hole density and cut area proportion,are analyzed and studied. At the same time,the proportion of cut area and shot hole density are fitted linearly. The results show that in practical engineering cases,the larger the cut area,the lower the hole density. On this basis,a perforation arrangement scheme combining digital electronic detonator is proposed,and it is applied to Gubei Coal Mine in Huainan City. The test results show that compared with the original scheme,the new scheme can increase the utilization rate of shot holes by 14. 34%,reduce the number of shot holes by 28. 33%,and reduce the cycle period from 10. 8 h to 9. 9 h,which can greatly indicate the monthly footage roadway excavation,and is expected to be popularized and applied in rock tunneling construction.

Key words: rock roadway excavation,blast hole density,digital electronic detonator,cut blasting