Shvager N. grounds of management bringing down of breeds and parameters of drilling and blasting operations on deep horizons of mines of Kryvoi Rog's iron-producing area

Dissertation is devoted to the decision of problem of increase of efficiency of underground extraction of ore to at the expense of the scientific and technical methods of control parameters of drilling and blasting operations and gob caving taking into account energetic descriptions of the developed explosives and physical properties of mountain rocks. The possibility of regulation of power descriptions of blasting explosive was determined is depending on physical properties of mountain rocks on the basis of creation of explosive composition which consists of no trinitrotoluene contain simplest water-filled charge of explosive the of type "Gidrodin" and exothermic mixture. Quantitative intercommunication was determined between the size of line of least resistance every next charge and breadthways bare surface, formed an explosion previous, that allows to take into account their place of location in relation to the limit of baring and promoted resistance of action of tensions of change and cut at the butt end and lateral stopping up. The possibility of decline of size of mountain pressure was proved on deep horizons of mines by localization of areas of change of rocks of hanging side and earthly surface due to building of preventive pillars from the made light breeds at their compression by an explosion, and the developed method of choice of parameters of dense charges of different form and orientation taking into account physical properties of blasting rocks, them the tensed and deformed state and necessary size of pushing of material which dense an explosion.