Makeiev S.YU., Kurnosov S.A., Ryzhov H.O., Nazieh H. Control of wave processes in the rock environment to reduce the risk of gas dynamic phenomena

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Parent Category: Geo-Technical Mechanics, 2022

Category: Geo-Technical Mechanics, 2022, Issue 161

Geoteh. meh. 2022, 161, 147-156

https://doi.org/10.15407/geotm2022.161.147

 

CONTROL OF WAVE PROCESSES IN THE ROCK ENVIRONMENT TO REDUCE THE RISK OF GAS DYNAMIC PHENOMENA

¹Makeiev S.YU., ¹Kurnosov S.A., ¹Ryzhov H.O., ²Nazieh H.

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

UDC 622.831.31

Language: English

Abstract. The article is aimed at developing new methods for controlling wave processes in a rock massif during the driving of development workings and coal mining in stopes. When carrying out underground mining, accidents are often caused by the fact that the safety regulations are not always strictly followed due to the difficulty in determining the causes and mechanisms for the initiation of gas-dynamic phenomena. The aim of the study was to create an adequate model of the process of generation of fracture wave foci in a coal-rock massif and to identify ways to create new method to control this phenomenon. Research tasks: to perform a theoretical analysis of the self-oscillatory nature of the formation of a self-sustaining destruction wave during the process of coal and gas outburst; to create a model adequate to this process; to identify ways to eliminate the potential possibility of the emergence of gas-dynamic phenomena. The mechanism of gas-dynamic phenomena through the use of concept of the flow of emissions in the form of a thermal explosion was reviewed, which allows to present the phenomenon of coal and gas emission as a result of the autowave process of self-sustaining propagation of a wave with the oscillator and spin instability. A mathematical model is proposed which describes the propagation of fracture wave in coal as a result of reaching a critical pressure gradient of the desorbed gas. The scientific significance of the research lies in the fact that an analytical expression has been (was) obtained to determine velocity of the compression wave propagation in the layer depending on the critical stress gradient. According to this expression, there are two different modes of the wave destruction process, which differ in (by) the propagation speed, structure and properties of the wave. This necessitates the use of a controlled physical-chemical impact (FCI), as it is less dynamic. A dimensionless empirical coefficient is proposed to assess the efficiency of the FCI and the degree of change in the state of the coal layer at the micro- and macrolevels. Its use will make it possible to select such a type of FCI, which will change the critical stress gradient in the coal to safe values. This will prevent the generation and development of a fracture wave characterized by a critical propagation velocity, and, thereby, will reduce the risk of gas-dynamic phenomenon occurrence. The results of the research can be used in the development of scientific prerequisites for improving the methods and means of controlling the stress-strain state and gas dynamics of a coal-rock massif by using various working environments.          
Keywords: gas-dynamic phenomenon, fracture wave, pressure distribution, stress gradient, physical-chemical impact.

 

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Makeiev Serhii Yuriiovych, Candidate of Technical Sciences (Ph.D.), Senior Researcher, Senior Researcher in Department of Problems of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of NAS of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kurnosov Serhii Anatoliiovych, Doctor of Technical Sciences (Sci.D.), Senior Researcher, Senior Researcher in Department of Problems of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of NAS of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Ryzhov Hennadii Oleksandrovych, Junior Researcher in Department of Problems of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of NAS of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Nazieh Hasan, Candidate of Technical Sciences (Ph.D.), Assistant Professor, Faculty of Engineering Technology, Zarqa University, Az Zarqa, Jordan, This email address is being protected from spambots. You need JavaScript enabled to view it.

 

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