№58-10

Control industrial experiments of explosion methods of rocks with differentiated energy saturation of mass

A. Skachkov¹, D. Titov², S. Zhukov²

¹Metinvest, Northern Mining and Processing Plant, Kryvyi Rih, Ukraine

²Kryvyi Rih National University, Kryvyi Rih, Ukraine

Coll.res.pap.nat.min.univ. 2019, 58:111-118

http://doi.org/10.33271/crpnmu/58.111

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ABSTRACT

The purpose of the research is an experimental control verificationof the effectiveness of the application and parametric refinement of the structural influence of the surroundingsby the technology of destruction of a rock mass with differentiated energy saturation of the latter under conditions of symmetrical action of borehole charges; elucidation of the relationship in the undermining of the rock blocks of natural and technological factors and the implementation of their most productive combination, as well as checking the measureof adequacy of the experimental research algorithm.

The methods of research are an analysis of geomechanical processes by mathematical modeling of the dynamic stresses of a rock mass by an explosion in open pits. The research methodology includes the planning of industrial experiments, geomechanical analysis of the state and stability of rock masses of different heights and lithology; clarification of the process of disseminationof elastic waves in a crystalline medium and their superposition; statistical analysis of surveying data and mathematical methods for processing the results of experimental and industrial tests.

Findings. For the theory and practice of blasting important to know the features of the formation and interaction force fields downhole explosive charge that undermine delayed. The superposition of elastic waves plays a major role in the destruction of the rock mass under these conditions. By selecting the masses of charges and the duration of the delay between the explosions, it is possible to regulate the explosive loading process depending on the specific mining and geological conditions of blasting operations. By changing the methods of forming and ordering the destruction of explosive charges in a destroyed volume, one can influence the process of destruction, knowing the peculiarities of the formation of force fields.

Conclusions. Given the time and geometric characteristics of the rock massif, it can be assumed that its tense state will fully correspond to the physical parameters of the integral zone, in which the superposition of the explosive waves is minimized.The obtained results can be used to develop explosive technologies based on the destruction of a mountain mass, which was previously subjected to a stressed state from explosion of explosive charges, for example, low power.

The originality is consists in the experimental verification of the author’s idea of symmetrical blasting of the rock mass, differentially saturated with the explosion, and the analytical substantiation of the parameters of objects and processes for the effective implementation of developments in the production practice of the open pits of mining and processing plants.

Practical implications. Further development and manufacturing application of the research results will provide a significant reduction in the cost price of iron ore products by increasing the efficiency of drilling and blasting operations in open pit.

Keywords: ore, explosive destruction, elasticwaves, blasting, borehole charges.

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