Pylypenko Yu., Kurnosov S., Makeiev S., Novikov L. Regularities of shock wave propagation in mine workings under the gas dynamic phenomena

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

Geoteh. meh. 2024, 170, 41-54

 

REGULARITIES OF SHOCK WAVE PROPAGATION IN MINE WORKINGS UNDER THE GAS DYNAMIC PHENOMENA

Pylypenko Yu.    Kurnosov S.  MakeievS.  Novikov L.

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

UDC 622.278 622.12 622.620.173:620.173:622.837

Language: English

Abstract. The feasibility of assessing the speed of shock wave propagation in mine workings by recording acoustic events in the massif using multichannel seismoacoustic methods was explored. The results in relative units are presented following the principle of normalization and considering functional dependencies. A physical model of the impact of gas-dynamic phenomena on the network of mine workings is substantiated. The model is based on the laws of gas dynamics and takes into account a release of methane and dust with variable concentrations during the formation of the aerodynamic environment in the mine atmosphere under the effect of outburst in the condition of real topology of the network of mine workings, ventilation equipment, and structures using as an example the workings and accidents occurred at the O.F. Zasiadko mine. The regularities of formation of aerodynamic environment in the mine atmosphere of dead-end workings during a gas-dynamic phenomenon were established. It was determined that outside the region of solid-phase outburst (coal, rock), a gas flow is formed, and its state and properties can be controlled by changing aerodynamic resistance and atmospheric pressure in the workings. Seismoacoustic and gas-dynamic parameters were formulated, along with the conditions for sequential development of the processes at methane-dust-air mixtures outbursts in the mine workings. The propagation of air shock waves was studied. The analysis and methodological approaches to describing the process in the form of correlation dependencies were performed. This allows justifying the use of source energy pressure equation and identifying areas of gas-laden zone to establish the nature of pressure increase in emergency workings. The parameters of air shock wave propagation in dead-end workings under different initial and excess gas pressure depending on the aerodynamic resistance and geometric parameters of the workings were determined with accounting availability of obstacles causing changes in front resistance and relative speed of air shock wave fronts. This made it possible to reveal the peculiarities of the dynamics of air shock waves in the network of mine workings taking into account losses at the junctions of various types of obstacles, the formation of an explosive environment under the coal and gas outbursts in the dead-end workings, which leads to disrupts of normal ventilation regime causing ventilation flow reversals and contamination of fresh air streams with gas.

Keywords: mine workings, control, seismoacoustics, properties, shock wave.

 

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About the authors:

Pylypenko Yurii, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, 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. , ORCID 0009-0009-8827-8165

Kurnosov Serhii, Doctor of Technical Sciences (Sci.D), Senior Researcher, Senior Researcher in Department of Problems of Mineral Mining at Great Depths, 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. , ORCID 0000-0003-1840-3169

Makeiev Serhii, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in Department of Problems of Mineral Mining at Great Depths, 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. , ORCID 0000-0002-7542-8082

Novikov Leonid, Candidate of Technical Sciences (Ph.D), Researcher in Department of Geomechanics of Mineral Opencast Mining Technology, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dniprо, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-1855-5536