METHOD OF EXPLOSIVE ROCKS DESTRUCTION OPTIMAL PARAMETERS DETERMINING TAKING INTO ACCOUNT OF THE PRE-DESTRUCTION ZONE

摘要

FIELD: drilling soil or rock.;SUBSTANCE: invention relates to the field of blast-hole drilling in rocks using multi-row short-delayed blasting (MRSDB) and can be used in various industries, using blasting operations in rocks. Method of explosive rock destruction optimal parameters determining taking into account of the pre-destruction zone includes measuring of the rock drilling specific energy intensity in the process of blasting wells drilling and calculation of the ES charges parameters by it, selection of the blasting schemes with specific retardation intervals above 25 ms/m, construction of the mass explosion development model in real time and space for a particular blasting scheme and design of charges, an evaluation of the explosion results from rock excavation data and selection of the optimal explosion parameters according to statistical data. Borehole charges amount is calculated differentially for different zones of the massif weakening occurring in two stages in the process of explosion development. At the first stage, determining the stress waves parameters by a preliminary graphical analysis of the planned blasting scheme on the drilled-around and the next blocks, passing through the vicinity of specific wells covered by pre-destruction zones from the explosions of previous borehole charges: number of waves, the direction of approach and the distance to the explosion of previous charges. At the second stage, when the next block is being drilled-around, the rocks weakening value in the nodes of the well grid is estimated by the previous graphical analysis and relating this weakening to the change in the charge of the wells value, repeating the process until the specified quality of crushing is achieved.;EFFECT: invention allows to determine the massif weakening intensity in the area of each exploded well during the mass explosion development and use the data to calculate the specific wells charges parameters.;1 cl, 4 dwg