Abstract
The purpose of this paper was to create a numerical model of explosive destruction of a rock slab by exploding a cylindrical explosive charge. The paper considers the features of solving the problem of explosive charge using the finite element method in a three-dimensional setting. The equations of state of materials used for calculations are given. The results of the laboratory experiment carried out on the basis of the laboratory: “Physical and technological processes of rock destruction” and “Physics of rock destruction by explosive energy” of the Department of Blasting works of the Mining University are presented. The comparison of the results of the laboratory experiment and the numerical modeling performed using the ANSYS software system is presented. Experimental research has shown that having clarified the constants in the polynomial equation of state of the material and the Johnson–Holmquist strength model, the results of numerical modeling, in general, are similar to the experimental ones. The obtained and verified numerical model of the cylindrical explosive charge blast is considered as the basis for choosing the optimal parameters of drilling and blasting works.
Highlights
During opencast mining one of the most important technical elements is rock defragmentation using an explosive method with subsequent loading and transportation of the rock mass outside the quarry
Examples of the stage of numerical calculation of the blast action are shown in Figures 4, 5
This paper presents a systematic approach to conducting computational experiments using the Ansys software system
Summary
During opencast mining one of the most important technical elements is rock defragmentation using an explosive method with subsequent loading and transportation of the rock mass outside the quarry. The development of methods to control the effect of a blast, providing the most complete consideration of specific conditions of blasting operations, as well as the correct combination and use of factors affecting the final result of the blast, delivers a quick and cost-effective solution to a particular technological problem. Conducting a range of laboratory experiments provided that the maximum number of similarity criteria are met. Based on these results, creating and conducting a numerical calculation of the rock sample destruction by blast [4]. A verified numerical model, including the results of experimental research, will make it possible to choose the optimal parameters of drilling and blasting operations for a particular field
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