Kratkovskyі I.L, Ishchenko О.K. Experimental and analytical studies to substantiate the blasting operations rational parameters in the hard media destruction

Details
Parent Category: Geo-Technical Mechanics, 2019
Category: Geo-Technical Mechanics, 2019, Issue 147

Geoteh. meh. 2019, 147, 28-41

 https://doi.org/10.1051/e3sconf/201910900040

EXPERIMENTAL AND ANALYTICAL STUDIES TO SUBSTANTIATE THE BLASTING OPERATIONS RATIONAL PARAMETERS IN THE HARD MEDIA DESTRUCTION

1Kratkovskyі I.L, 2Ishchenko О.K.

1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, 2National Technical University Dnipro Polytechnic

UDC 622.235

Language: English

Abstract.

The article is aimed а method and an experimental research technique in the field conditions for justifying the choice rational parameters of blasting operations and optimal constructions of charges in the hard media destruction was elaborated.

The method of sieve analysis studied particle size distribution of the products explosive destruction of sand-cement models with elliptical compensatory cavity in its middle that were destroyed with use of various designs explosive charges and built the cumulative distribution curves. It was established that the area of the newly formed surface of these models destruction products, destroyed by an explosion of variable cross section charges, increased 1.4–1.45 times as compared with charges of other structures (with a boiler in the extension of the charge end, solid structure). The middle diameter of particles increased at 50-60%. According to the results of the fractional composition, distribution of the products models destruction for different designs and geometric parameters of the compensation cavity has been defined by the regression lines. According to the cumulative distribution curves of the products of destruction of a model with different geometrical parameters of the compensation cavity, around which various designs of explosive charges were exploded, the equations of the regression lines was determined. The dependences of the granulometric composition distribution of model part which was detonated by charges of different deigns explosives when they were undermined on the compensating cavity were constructed. Established distribution uniformity of grain size to charge variable section compared to other designs charges. At the same time, the yield of both small and large fractions is evenly distributed, the average piece and the mass of the part reflected in the model of the model for charges of a variable section increases.

The regularities of influence design explosive charge and the compensation cavity parameters on grain size distribution of hard media which destroyed by explosion were established. It is proved that the absolute value of the correlation coefficient of large and small fractions destroyed by the explosion of hard medium tends to 1. These coefficients are interconnected by a stable linear dependence. For medium fractions, the number of which is insignificant, their correlation ratio is small and is nonlinear in relation to the dimensions of the compensating cavity.

The conducted studies allowed substantiating the parameters of the compensating cavity (the axis of small and large ellipses) in the rocks and the choice of the effective design of the charge of the explosive. Recommendations for their use in mines are given.

Keywords: solid medium, explosive, charge structure, particle size distribution.

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Abouttheauthors

KratkovskyіIhor Leonidovych, Candidate of Technical Sciences (Ph.D.), Senior Researcher, Senior Researcher in Department of Rock Explosion Mechanics,  Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine(IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Ishchenko Oleksii Kostiantynоvych, Candidate of Technical Sciences (Ph.D.), Associate Professor of the Department of Construction, Geotechnics and Mining Mechanics, National Technical University Dnipro Polytechnic (NTU “DP”), Dnipro, Ukraine

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