"Explosion technology"— scientific and technical journal

On the basic provisions of the classification of rock massifs by blockness

Keywords:rock massifs, blockiness, blockiness category, blockiness classes, fractionation coefficient, technological blsting, technological parameters

This article describes the main provisions of the classification of rock massifs by blockiness. A tabular form of classification of rock massifs by blockiness is selected, categories of rock massifs by blockiness are selected, classes of blockiness of massifs and fractionation coefficients of massifs for each category of blockiness and for each class of blockiness of rock massifs are selected.

1. Kazakov N.N., Viktorov S.D., Shlyapin A.V., Lapikov I.N. Crushing of rocks by explosion in quarries. - Russian Academy of Sciences, 2020, p. 517.
2. Adushkin V.V. Model studies of destruction of rocks by explosion. "Physical problems of explosive destruction of rock massifs". - M .: IPKON RAN, 1999. - P.18-29.
3. Kutuzov B.N. Design of blasting operations in industry M. Nedra, 1983. P. 359.

Lassification of rock massifs by blocknes at the deposit

Keywords:rock massif, blockiness, category of blockiness, classes of blockiness, coefficients of fractionation, classification of blockiness of rock massif

This article describes the provisions of the classification of rock massifs by blockiness. The fractionation coefficients of massifs are considered for each category of blockiness and for each class of blockiness of rock massifs. As an example, a classification of the blockiness of the rock massifs of the Mikhailovsky quarry has been developed.

1. Kazakov N.N., Viktorov S.D., Shlyapin A.V., Lapikov I.N. Crushing of rocks by explosion in quarries. - Russian Academy of Sciences, 2020, p. 517.
2. Adushkin V.V. Model studies of destruction of rocks by explosion. "Physical problems of explosive destruction of rock massifs". - M .: IPKON RAN, 1999. - P.18-29.
3. Kutuzov B.N. Design of blasting operations in industry M. Nedra, 1983. P. 359.

Investigation of the dynamic working of long charges by composition models coupling with computer simulation by the smoothed particle hydrodynamics method

Keywords:explosive, elongated charge, fragmentation, physical experiments, computer simulation, SPH (Smoothed Particle Hydrodynamics method)

The Smoothed Particle Method (SPH) is used to simulate the dynamic fracture, fragmentation and blasting process during explosive mining in quarries and mines. The SPH method is calibrated by simulating the process of fragmentation by an explosion in comparison with the results of experiments on explosive destruction of rock samples when detonating an elongated borehole charge. At the same time, an adequate representation of the development of the stress-strain state in the geomedium and the process of cracking, resulting in the fragmentation of the samples, was observed. After calibration, the SPH method was used for three-dimensional modeling of dynamic fracture and the resulting fragmentation in the exploded block of the developed rock mass. The influence of the distance between the wells and their diameter was investigated. The relevance of research is due to the need to expand the possibilities of controlling the action of the explosion to obtain rational fragmentation of the rock mass, as well as the economic feasibility of reducing the loss of minerals, and eliminating the negative factors of blasting. For this purpose, work was carried out to study the effect of the kinetics of energy release and the parameters of drilling and blasting operations on the intensity and uniformity of fragmentation.
The work was carried out within the framework of the budgetary theme of IPKON RAS.

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Development of effective parameters of ground debonding of trench discharge charges by physical modeling in industrial conditions

Keywords:trench charge, discharge, explosive consumption, ground embankment, form of embankment, mass humidity

This article presents a developed method for determining the effective parameters of soil embankment of trench discharge charges by physical modeling. For the first time, a parabolic pattern of changes in the size of the cross-section of recesses depending on the mass humidity, height and shape of the ground embankment of trench discharge charges was established in order to establish their effective parameters.

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Industrial verification implementation of the developed parameters of soil embankment, as well as the method for forming trench discharge charges when forming elongated recesses

Keywords:trench charge, discharge, explosive consumption, ground embankment, form of embankment, mass humidity

This article presents a developed and experimentally tested new engineering method for calculating the effective parameters of soil embankment of trench explosive charges, on the basis of which a nomogram and a program for calculating the effective parameters of soil embankment of trench discharge charges are developed. A new method for forming recesses by explosions with a trapezoidal shape of ground embankment of explosive trench charges was developed and experimentally tested, which provides an increase in the efficiency of the explosion by controlling emissions, with a sufficient width of the profile section of the recess along the bottom of 50 m or more.

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11. Norov Yu.D., Urinov Sh.R. Determining the size of recesses depending on the width of the trapezoidal shape of the ground embankment and the specific consumption of trench discharge charges // Scientific-technical and production journal «Mining Bulletin of Uzbekistan» No. 3 September 2005, pp.37-38. http://gorniyvestnik.uz/assets/uploads/pdf/2005-iyul-sentyabr.pdf
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14. Norov Yu.D., Urinov Sh.R., Islomov N.R., Mirzaeva F.D., Norov A.Yu., Amirkulov K. S. Justification and development of effective parameters of soil embankment of trench discharge charges. / Final report on budget topic A-4-015. Navoi, Funds, NavSMI, 2008, 135 p.

Current trends of emulsion explosive production

Keywords:industrial explosives, emulsion explosives, explosive production range, production output, market share, manufacturing facilities, plants, mobile explosives manufacturing units

This article presents the industrial explosive production range used over the past decade in Russia. The data provided herein refers to demand dynamics for emulsion explosives, their production outputs by key manufacturers. The paper describes various options of emulsion explosive preparation technology along with the relevant plants and mobile explosives manufacturing units (MEMU).

Investigation of physical and chemical properties and detonation characteristics of emulsion explosive compoound based on «FORESPHERE» microspheres produced by «FORES» LTD

Keywords:glass microspheres, emulsion matrix, emulsion explosives, detonation velocity

The present article deals with the studies on the detonation characteristics of emulsion-type explosive Poremit, sensitized by ForeSphere microspheres. A comparison is made between physical and chemical properties of microspheres of different types and manufacturers as well as between detonation characteristics of emulsion explosives sensitized by these various microspheres.

Calculation of parameters of borehole charges of emulsion explosives with help of a mathematical system MathCAD

Keywords:blast, blasting works, emulsion explosive, explosive density, parameters of drilling-and-blasting works, safety of mass explosion

In practice of explosive business quite difficult calculations demanding obtaining exact results for safety and quality of the conducted explosions often meet. One of such calculations is determination of length, density and mass of charges of the emulsion explosives sensitized the gas-generating additive. In article it is offered to automate design of blasting works with the help of the mathematical Mathcad system that allows quickly and from a fine precision to determine parameters of borehole charges.

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Technology of blasting operations in combined field development

Keywords:explosion, explosive, well drilling, rock formation, charge shape, inert gap, smoothed particle hydrodynamics (SPH) method for simulation, combined development system

Aspects of the methodology of a new approach to solving the problem of substantiating a rational technology of rock destruction in a quarry that provides seismic safety for underground mine workings are presented.
Fragments of achieving the results of the set tasks are described, including their scientific and technical justification, which makes it rational to search for new reserves to significantly increase the efficiency of technical and economic indicators of mineral development by combined development systems.

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Justification of the efficiency and environmental safety of open-pit mining of mineral raw materials

Keywords:drilling and blasting operations, quarry, crushing, explosive rebound, charge, geoecology, quality, geoinformation systems

The article presents the main scientific and practical results of improving the efficiency and environmental safety of open-pit mining of mineral raw materials during blasting operations on the basis of optimizing design solutions by introducing innovative geotechnologies, based on mathematical modeling of technological processes and geoinformation systems. The improvement of blasting operations in quarries based on new blasting schemes, analysis of experimental data, generalization of experience and mathematical processing methods is an urgent task. The use of geoinformation systems is a promising reserve for improving the efficiency and environmental safety of mining production with a reduction in the negative impact on the natural environment. The use of the proposed solutions will increase the estimated profit from processing and processing of ores by 5-7 %.

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Investigation of the process of dust formation during blasting of hard rocks

Keywords:quarry, mining allotment, dust, air exchange, calculation of the amount of dust, screen for aerosols, green mining

The paper analyzes the factors of the appearance of dust during blasting operations with blast holes in rocky and semi-rocky massifs. It was found that the bulk of the dust is formed in the blasthole during direct contact of the explosive with the rock. Under the influence of wave processes and explosive, a layer of over-crushed rocks is formed in the borehole sides, which is the basis for the formation of fine dust. The paper gives a formula for calculating the layer of over-crushed rocks. On the example of one of the quarries, the cycle of air exchange in the working space is shown and the rules of movement of air masses are identified. On the basis of consideration of a specific air exchange scheme in a quarry, it is proposed to use a screen to slow down the propagation rate of aerosols and dust deposition within the boundaries of the mining allotment.

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Safety of technological processes and labor protection of miners are the main conditions for conducting blasting operations at mining enterprises

Keywords:explosive and ore dressing, safety and health protection, emulsion explosive, well, collapse, detonation, critical diameter, ammonium nitrate, nitrogen oxides

In September, 2020 successfully there took place the next International scientific and practical conference on explosive and mining and processing business. A main objective of carrying out conference was discussion of a wide range of questions of carrying out explosive works, an exchange of scientific and technical information, definition of the perspective directions of creation and development of new equipment and safe technologies. In a zone of attention of experts of explosive business there are researches of major factors of negative impact of open mining and explosive operations on habitat, development of rules of safe carrying out large-scale mass explosions on pits. And also to questions of the technogenic seismicity accompanying oil production, gas and firm minerals. Safety issues of explosive works always are the major at design of mass explosions. Reliability of an explosive complex and non-failure operation applied borehole and the shpurovykh of charges of VV is a basis by preparation and carrying out explosive works. It should be noted the importance of such discussions and exchange of experience at the conference venues, which gives an impetus to improving technologies and improving their implementation efficiency.

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