Calculating the destruction of mountain rocks by drilling charges with differentially distributed explosives in their series

D. Malykh; G. Eremenko; D. Titov

Calculating the destruction of mountain rocks by drilling charges with differentially distributed explosives in their series

D. Malykh G. Eremenko D. Titov

Received 21.01.2023, Revised 23.03.2023, Accepted 25.04.2023

Abstract

Purpose. To increase the accuracy of calculations in the mathematical modeling of the interaction of well-hole charges, in which parts of the explosive substance are dispersed along the length of the well with inert material, which are detonated sequentially. The peculiarities of the dynamic load of the rock massif being blown up were analyzed, depending on the sequence of separation of these charges and their parts. This clarification relates to the improvement of the parametric calculation method and is aimed at solving the actual problem - reducing the specific consumption of explosives for the destruction of rocky massif. Research methods. Analysis of geomechanical processes by mathematical modeling of the dynamic stresses of a rock mass by an explosion in open pits. Scientific novelty. Clarifying the regularity of interaction of the explosion energy of borehole charges of a special design with the rock massif surrounding them. Practical significance. Further development and industrial application of research results ensures a significant reduction in the cost price of iron ore products due to increased efficiency of drilling and blasting operations in iron ore pits. Results. For the theory and practice of blasting, it is important to know the features of the formation and interaction of the force fields of borehole charges that detonate with a delay. The main role in the process of destruction of the mountain mass under these conditions is played by the design of blasting well charges. By selecting the masses of charges with different ratios of their parts in wells of successive rows and varying the duration of the delay between explosions, it is possible to regulate the process of explosive loading depending on the specific mining and geological conditions of blasting operations. By changing the methods of formation and the order of detonation of charges in the destroyed massif, it is possible to influence the process of destruction, knowing the peculiarities of the formation of force fields. Given the temporal and geometric characteristics of the rock massif, it can be assumed that its stressed state will fully correspond to the physical parameters of the integral zone, under which the loss of blast wave energy is minimized. The obtained results can be used for the development of explosive technologies based on the destruction of a rock mass previously brought into a tense state by the explosion of explosive charges, the design of which is proposed by the authors of this study

Keywords:

rock; blasting; explosive destruction; rock massif; borehole charges

Retrieved from Vol. 57, No. 1, 2023

Pages 104–110

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Malykh, D., Eremenko, G., & Titov, D. (2023). Calculating the destruction of mountain rocks by drilling charges with differentially distributed explosives in their series. Mining Journal of Kryvyi Rih National University, 57(1), 104-110.