№60-09
Issues of possible ignitions of methane-air mixture in the mine due to the implementation of mechanoelectric and piezoelectric effects during coal mining
S. Mineev1, S. Makeiev1, І. Belikov2, P. Samopalenko3, А. Golovko4
1Institute of Geotechnical Mechanics Named by N. Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine
2The Central Headquarters of the State Paramilitary MinеRescue Service of Coal Industry of Ukraine, Mirnograd, Ukraine
3The Eighth Militarized Mine-Rescue Detachment, Pavlograd, Ukraine
4The Tenth Militarized Mine-Rescue Detachment, Mirnograd, Ukraine
Coll.res.pap.nat.min.univ. 2020, 60:93-105
https://doi.org/10.33271/crpnmu/60.093
Full text (PDF)
ABSTRACT
The purpose of the work is the study and justification of the possible causes of ignitions of methane-air mixture during the tunnelling of workings and the excavation of coal in the mines
Research methods. Analysis of the physical and mathematical models of the origin and development of gas-dynamic phenomena with the subsequent ignition of methane in coal mines was investigated for justify its reasons. The thermodynamic state of the massif in the form of the tensor considered for Lagrangian coordinates. Estimation of the entropy increase for the massif element was investigated not only by changing its mechanical properties, but at the expense of occurrence in it of thermoelectric phenomena.
The results. It is proved that the velocity of processes in the rock massif associated with the entropy change is determined not only by its mechanical properties, but also depends on the thermoelectric phenomena. The hypothesis of ignition of methane-air mixture due to the piezoelectric effect, caused by deformation of the quartz grains under the action of external pressure, was further developed. It is shown that the shores of the cracks in the destroyed material pose a potential pole slip between micro-plasma discharges in the breakdown of hydrocarbon gas. Estimation of growth rate of cracks per unit volume of the rock massif was investigated. The ability to control this process by reducing the coefficient characterizing the accumulation of elastic energy in region of crack tip, was grounded. The physicochemical treatment of the coal seam proposed, which increases the critical value of stress intensity factor, greatly increasing the durability of the bottom-hole massif.
Scientific novelty. The qualitative dependence of specific growth rate concentration of cracks per unit volume from time to time established. It shows that it is possible to reduce the likelihood of exponential growth of cracks by reducing the coefficient characterizing the accumulation of elastic energy in region of crack tip.
The practical significance. The activities, which to be included in recommendations for the prevention of ignitions of methane-air mixture during the tunneling working and dredging of coal explosion and fire formation, is proposed.
Keywords: methane-air mixture, the gas-dynamic phenomena, microcracking, the piezoelectric effect, the formation of cracks.
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