Technology of deep hole blasting relief of the hard roof of coal seams and optimization

摘要

Pressure release by blasting of a deep hole in roof of a fully-mechanized face interconnection can shorten the first collapse step distance of the roof, and avoid rock burst disasters that may cause a large area of roof collapse. Based on the actual geological conditions of 6303 working face interconnection in Jining No.3 Coal Mine, this article proposes the two schemes of blasting pressure release of roof interconnection, based on rock blasting mechanism. By using of Ansys-dyna finite dynamic analysis software, this paper simulates blasting effect to the two schemes of deep hole blasting. With the analysis of numerical simulation results, blasting parameters were optimized and a reasonable blasting scheme was obtained.