STUDY ON MISFIRE INDUCED BY SYMPATHETIC DETONATION BETWEEN BOREHOLE OF MILLISECOND BLASTING IN KARST-DEVELOPED AREA

Borehole of long hole bench millisecond blasting in Karst-developed area is transfixed by karst cave and cranny.Charge of other borehole is blasted by shock weve of earlier blasting boreholes through cranny,consequently priming circuit is destroyed and misfire is brought.Based on some blasting of certain limestone mine in this paper,reason of produced misfire of karst cave and cranny brought about sympathetic detonation of neighbouring boreholes is analyzed.Some good measure of prevent misfire is advanced.