Mining Journal of Kryvyi Rih National University

Abstract

Purpose. The main goal of this article is the selection of reliable and adequate analytical methods and methods of their experimental verification for a comprehensive and systematic study of physical processes that occur during the explosive destruction of rock by well charges of special structures, in order to ensure a balanced distribution of explosive energy in the rock mass that is being blown up, as much as possible in accordance with the variable physical and mechanical characteristics of rocks in individual local zones of the explosive block. The methods of research are a comparative analysis of modern, reliably tested simulation and mathematical models of geomechanical processes. At the same time, the maximum adequacy of the methods for the task of accurately determining the full tensor of the stress-strain state of rocks under conditions of dynamic stress by blasting a rock massif of a complex structure in open pits served as the criterion of suitability for the subsequent selection of methods most suitable for the purposes of the study. Findings. On the basis of the performed analysis, a set of scientific and methodological approaches was formed as a toolkit for basic theoretical and experimental investigations, the application of which ensures the clarification of the mechanism of creation and development of the dynamic load of the rock massif by explosion, as determined by the author, for the subsequent development and substantiation of reliable methods of control this process in a coordinated way in space and time short-delayed detonation of groups of well charges of special structures. At the same time, structural regularities and local anomalies of the array, anisotropy of its properties, change of state, etc. are taken into account. Only by reliably knowing the systemically significant temporal and spatial characteristics of the rock massif, it is possible to adequately model its dynamic evolution and develop sufficiently grounded theoretically appropriate mathematical models with an algorithm for their applied use, which are really suitable for implementation in the practice of open mining. The originality of the article material lies in the systematic approach to the substantiation of the theoretical basis of balanced energy saturation of the rock massif by detonation of combined well charges and the corresponding means, measures and technical solutions. Practical implementation. The presented methodological approach and its further development are quite suitable for formulating the content of similar studies and their planning, contributing to solving the problems of reducing the cost of iron ore products by increasing the efficiency of drilling and blasting in iron ore pits

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Retrieved from Vol. 58, No. 1, 2024

Pages 114–121