Gorobets L.J., Verhorobina I.V. Regularities of formation of geological material particles granulometry at their destruction

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Parent Category: Geo-Technical Mechanics, 2018

Category: Geo-Technical Mechanics, 2018, Issue 140

Geoteh. meh. 2018, 140, 50-60

DOI:  https://doi.org/10.15407/geotm2018.03.050

REGULARITIES OF FORMATION OF GEOLOGICAL MATERIAL PARTICLEs GRANULOMETRY AT THEIR DESTRUCTION

¹Gorobets L.J., ²Verhorobina I.V.

¹National Technical Univercity «Dnepr Polytechnic»,²Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC [622.02: 539.2/8]: 620.174.24

Language: Russian

Abstract.

The purpose of work consists of generalization of conformities to the law of forming of distributing of particles on sizes at destruction (growing shallow) of materials from positions of new  discoveries in physics of destruction and modern knowledges about development  of fragmentation in loaded geomateryal, in particular, taking into account discretely-wave nature of matter, аutoresonance mechanism of destruction (dispersion) and fractal law about the polymodal distributing of particles on sizes. The laws of formation of by-size distributions of crushed particles at geomaterial destruction are considered with taking into account bonds, which determine structure and level of energy accumulation to the moment of the solid disintegration into fragments and partings. An important factor in the microcrack interaction and coalescence is heterogeneity of the loaded body structure. Physical principles, criteria and parameters of the fragmentation development under geological material loading are substantiated. The leading part in development of dispersion effects is assigned to the autoresonance stage. Principle of self-similarity of destruction at any scale level sets the relationship between the length of acoustic waves during discontinuities and the length of cracks. Scientific background for the study of the destroyed particle granulometry is formulated. A new approach for solving the problem under the study assumes the use of interrelations between discrete-wave criterion for microdestruction and the dispersion process. A physical explanation is given to the pattern of appearance of maxima in curves of the particle distribution by their sizes. The process of forming the particle distribution by size during destruction (crushing, grinding) is realized through the pattern of geometric progression for some typical particle sizes, the basis for which is value of criterion of discrete-wave microfracture Вl= 2,1–3,1. The examples of the study confirm principle of similarity of the crack and parting distributions. Since typical sizes of the formed particles are multiples of the value of Вl, it seems appropriate, when evaluating the crushed products granulometry, to keep a value of the classification module at the level of discrete-wave criterion of microfracture. 

Key words: geological materials, crack, fracture, discrete-wave criterion, grinding, granulometry.

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About the authors:

Gorobets Larisa Zhanovna, Doctor of Technical Sciences (D.Sc), Professor, National Technical University «Dnipro Polytechnic» (NTU “DP”), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Verkhorobina Inna Vladimirovna, Master of Sciences, Principal Engineer of Department of Geodynamic Systems and Vibration Technologies, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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