Minieiev S., Usov O., Yanzhula O., Bodnar A., Rud V. Study of the effect of saturating coal samples with “the Shtamex” foaming agent solution on their outburst hazard indicators
- Details
- Parent Category: Geo-Technical Mechanics, 2024
- Category: Geo-Technical Mechanics, 2024, Issue 171
Geoteh. meh. 2024, 171, 153-166
https://doi.org/10.15407/geotm2024.171.153
STUDY OF THE EFFECT OF SATURATING COAL SAMPLES WITH
“THE SHTAMEX” FOAMING AGENT SOLUTION ON THEIR OUTBURST HAZARD INDICATORS
1Rud V.
M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine
2Limited Liability Company «METINVESTKHOLDING»
UDC 622.272:67.02
Language: English
Abstract. The article presents the results of studies on the mechanical parameters of coal samples from seam d4 of the PJSC Pokrovske Mine Administration in their supplied state and after treatment with “the Shtamex” foaming agent solution. The studies showed that these coal samples exhibited very high outburst hazard compared to other samples from the same seam. In addition, they had abnormally high water permeability. Deformation curves were obtained, which express the relationship between mechanical stresses and deformations under uniaxial compression of cubic-shaped samples with an edge length of 40 mm and a central hole with a diameter of 6 mm. The holes were drilled perpendicular to the layering of the samples. Their loading was applied in the same direction. The modulus of elasticity (yield) of dry samples was assessed by deformation curves with a limited load of not more than 5 MPa - at the level of 30–40% of the expected maximum. The load limitation minimized the effect of sample integrity disruption due to the beginning of the cracking process. The yield of dry samples was assessed by the deformation curves under the full load of the same samples. The full load included the stress increase phase, the transition through the temporary strength limit and the stress drop phase up to the destruction of the samples. The outburst (impact) safety factor was calculated as the ratio of the modulus of elasticity to the modulus of stress drop beyond the temporary strength limit. The abnormally high water permeability of the samples made it impossible to saturate them with “the Shtamex” solution using the standard IGTM’s methodology under the mode of two-dimensional flow filtration from the periphery to the central hole. Instead, saturation was performed by a less perfect method - holding the samples under an excess pressure of 0.15 MPa for 45 minutes. During this holding period, 2–3 short-term discharges of part of the solution mixture were made through the central hole of the sample and the drainage channel. It was established that saturation of the samples with “the Shtamex” solution reduces the modulus of elasticity, i.e. increases the coal yield. In this regard, the effect of “Shtamex” is similar to the effect of water, traditional SAAs and emulsions. However, the increase in yield is at least 1.3 times higher from “Shtamex” than the increase from water, traditional SAAs and emulsions. Just like water, traditional surfactants and emulsion, “Shtamex” increases the outburst safety coefficient. The increase in outburst safety at a 3% concentration of “Shtamex” is at the level of water and traditional SAAs, whereas at a 6% concentration of “the Shtamex”, it becomes almost twice as effective as them.
Keywords: yield, temporary strength limit, modulus of drop, outburst hazard.
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About the authors:
Мinieiev Serhii, Doctor of Technical Sciences (D.Sc.), Professor, Head of Department of Pressure Dynamics Control 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.
UsovOleh, Candidate of Technical Sciences (Ph.D), Senior Researcher, 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. (Corresponding author)
Yanzhula Oleksii, Candidate of Technical Sciences (Ph.D.), Director of Directorate for Technical development, Capital Construction and investments, Limited Liability Company «METINVESTKHOLDING», Pokrovs’k, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Bodnar Andriy, Master, Manager at the Limited Liability Company "METINVESTHOLDING", Pokrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Rud Volodymyr, Technician of the Department of Management of Dynamic Manifestations of Mining Pressure, 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.
