METHOD TO ARRANGE DEEP PROFILED GROOVES BY MEANS OF EXCAVATING EXPLOSIONS Russian patent published in 2013 - IPC F42D3/04 E02F7/06 

FIELD: mining.

SUBSTANCE: method to arrange profiled grooves as a result of excavating explosions includes tunnelling of mines, placement of explosive charges in them and explosion. Explosive charges are placed into several tiers along height, and charges are exploded in turn in direction from the upper tier to the lower one. Charges are exploded in each subsequent tier after formation of a blasting cone after explosion of charges of the previous tier. Charges are arranged into two or three tiers. The length of the line of the least resistance of each charge in each tier does not exceed 35 m. Tunnelling of mines for placement of charges is carried out individually for each charge.

EFFECT: improved performance of excavating explosions due to reduced consumption of explosives, scope of preparatory works related to tunnelling of mines, reduced dimensions of hazardous zones by throwout of rock pieces, seismic loads, intensity of air impact waves and propagation of toxic explosion gases.

4 cl, 1 dwg, 1 tbl