OPTIMAL ES CHARGE DETERMINING METHOD TAKING INTO ACCOUNT OF THE PRE-DESTRUCTION ZONE Russian patent published in 2019 - IPC F42D3/04 

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 explosive wells drilling and the ES charges parameters calculation by it, selection of blasting schemes with specific deceleration intervals above the 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: the number of waves and the distance to the previous charges explosion. 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 when the next mass explosion designing under similar conditions, calculating the ES specific consumption q_n by each specific well by the formula: q_n=q⋅K, where q is the ES specific consumption without considering of the wells vicinity preliminary destruction, kg/m³; K is the coefficient for taking into account of the wells vicinity pre-destruction from the stress waves with distance.

EFFECT: technical problem to which solving the disclosed invention is aimed, is the array weakening intensity determining in the area of each exploding well in the massive explosion development process in the real rock massif on the basis of taking into account of the pre-fracture zones sizes and its use in calculation of the specific wells charges parameters.

1 cl, 6 dwg