METHOD FOR PRODUCTION OF CUTTING CAVITY Russian patent published in 2010 - IPC F42D3/04 

FIELD: blasting.

SUBSTANCE: invention is related to mining, more specifically - to methods for production of cutting cavities when drilling underground mine tunnels by blast-hole drilling method in coal and mining industry under conditions of non-explosive mine atmosphere. Method includes drilling of central well and neighboring peripheral blast holes perpendicularly to bottomhole plane, charging of peripheral blast holes with cylindrical tier charges, and charging of central well with concentrated tier charges, and blasting of all charges in a certain sequence. Concentrated charges are arranged in well at the level of inertial plug located between charges in peripheral blast holes. Blasting of all charges is carried out with continuous moderation, starting from those adjacent to wellhead part of pass to more deepened, and in each tier - by alternation of simultaneous explosion of all cylindrical charges in peripheral blast holes with concentrated charge in well.

EFFECT: invention makes it possible to increase efficiency of making deep cutting cavity and to eliminate possibility of charges compression.

3 dwg