Klochko I. Controlling the quality of blasting at open-pit mines during exploitation of fluxes and construction materials.

This dissertation deals with the important issue of decreasing of mineral deposits wastage during drilling and blasting breaking using regrinding with simultaneous decreasing of the final product's prime cost. The dynamic boundary of hardness ( ) was suggested as a parameter that character-izes the medium at dynamic load. Based on the proposed description of way of action of explosive products in a rock material, it was established that for the whole range of rocks the crushing work ( ) is primarily defined by the blast energy and depends on detonative parameters of blasting materials. The amount of dissipative energy losses of blasting material depends not only on characteristics of medium and parameters of the blast, but also on the way of development of relationship between physical and mathematical properties of rock material and isentropes of explosive products during the crushing process. Further development in study of action of jet charges in rock material was accomplished and their effective designs were developed. Based on the proposed operational principles of jet charge in a rock material, there is a possibility to calculate the real parameters of the load. It was also shown that high performance operation of jet charges can be achieved only using the correct coupling between the parameters of load and medium. For any raw rock materials the best to use are jet charge loads with bigger coverage area and less peak pressure at it.