METHOD FOR FORMATION OF CHAMBER CHARGES Russian patent published in 1995 - IPC

FIELD: mining and construction; applicable in ground mass moving by explosion of chamber charges. SUBSTANCE: prior to laying of ammonium nitrate to opening to be charged, trial laying of layer of ammonium nitrate contained in dump-proof bags is accomplished, and hollowness is determined by formula H=100(1-nV_b/V_l), where n is amount of ammonium nitrate in layer of trial laying; V_b is volume of a bag with ammonium nitrate, cu.m; V_l is volume of layer of ammonium nitrate contained in bags in trial laying, cu.m. Then, ammonium nitrate is placed in chamber with ammonium nitrate contained in damp-proof bags with layers of loose ammonium nitrate. Loose ammonium nitrate is placed to fill hollows in bag pile. In so doing, ratio of mass of said layers of (100/H: 1) is to be observed, where H is hollowness of layer of ammonium nitrate contained in bags. Then live primer 8 is installed, blasting circuit 9 is wired, and stemming is made in approach opening. After supply of diesel fuel and upon expiration of time required for its filling of hollows of ammonium nitrate pile, blasting is effected. EFFECT: higher parameters of blast and cut down expenditures. 1 dwg