Ishkov V., Baskevych O., Kozii Ye., Pashchenko P. The influence of thermodynamic processes of explosive impact on the crystal structure of quartz granites of the Starokоdatskyi quarry

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Parent Category: Geo-Technical Mechanics, 2024
Category: Geo-Technical Mechanics, 2024, Issue 170

Geoteh. meh. 2024, 170, 110-118

 

THE INFLUENCE OF THERMODYNAMIC PROCESSES OF EXPLOSIVE IMPACT ON THE CRYSTAL STRUCTURE OF QUARTZ GRANITES OF THE STAROKОDATSKYI QUARRY

1,2Ishkov V., 3Baskevych O.,1,4Kozii Ye., 2Pashchenko P.

1Dnipro University of Technology

2M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine

3Ukrainian State University of Science and Technologies

4State Agrarian and Economic University

UDC 549

Language: English

Abstract. The study was conducted on granite samples collected from one area of the Starokodatskyi quarry. They were selected before (core from an exploration well) and after (outsize rock torn off by an explosion near the southern side of the quarry) drilling and blasting operations. To obtain optically monomineralic phases, the samples were subjected to magnetic separation on a three-roller separator, which allowed to isolate four fractions with different magnetic properties. After that, all samples were sent for X-ray structural analysis using DRON-3 X-ray diffractometer with monochromatized Co-K-α radiation (I = 1.7902Å). Identification of individual minerals was performed manually by comparing the interplanar distances (d, Å) and relative intensities of the experimental curve with the data of the PCPDFWIN electronic file. All X-ray phase studies were carried out within angles of 10–90º with a step of 0.1º and an exposure time of 5 seconds.

The analysis of the obtained results indicates a significant impact of drilling and blasting operations at the Starokоdatskyi granite quarry on the size of quartz crystallites, one of the most important elements of its fine crystalline structure. The phenomenon of a decrease in both the total size of crystallites and their dispersion along individual crystallographic planes under the influence of drilling and blasting operations has been established. It has been proven that an increase in the content of different sizes "impurities" significantly affects the reduction in the size of crystallites of optically monomineral quartz granitoids of the Starokоdatskyi quarry, which leads to changes in its physical properties, in particular magnetic.

The scientific novelty of the results consists in establishing the phenomenon of a decrease in the size of the coherent scattering regions of X-rays (crystallites) of optically monomineral quartz of granitoids of the Starokоdatskyi quarry under the thermodynamic influence of drilling and blasting operations. This is one of the main characteristics of changes in the substructure of the crystal lattice of quartz - one of the main rock-forming minerals of granites of this deposit under the thermodynamic influence of blasting operations.

The practical significance of the results of the work consists in the identification of significant qualitative changes in the crystallochemical structure of quartz granitoids of the Starokоdatskyi quarry, which can be used to predict their properties in the production of concrete products, the manufacture of decorative materials and the construction industry in general.

Keywords: quartz crystallites, crystal structure, crystallographic planes, granitoids, Starokоdatskyi quarry, drilling and blasting operations, magnetic separation.

 

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About the authors:

Ishkov Valerii, Candidate of Geological and Mineralogical Sciences (Ph.D.), Associate Professor in Department of Geology and Mineral Prospecting, Dnipro University of Technology, Dnipro, Ukraine; Senior Research in Laboratory of Studies of Structural Changes in Rocks, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID0000-0002-3987-208X

Baskevych Oleksandr, Candidate of Physical and Mathematical Sciences (Ph.D.), Senior Research, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID0000-0002-3227-5637

Kozii Yevhen, Candidate of Geological Sciences (Ph.D.), Associate Professor in Department of Geology and Mineral Prospecting, Dnipro University of Technology, Dnipro, Ukraine; Associate Professor in Department of Civil Engineering, Construction Technologies and Environmental Protection, Dnipro State Agrarian and Economic University, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-2167-6224

Pashchenko Pavlo, Candidate of Geological Sciences (Ph.D.), Senior Research in Laboratory of Studies of Structural Changes in Rocks, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID0000-0001-7217-645X