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Geophysical criterion of pre-outburst coal outsqueezing from the face space into the working

International Journal of Mining Science and Technology 2019年第3期29卷 499-506页

作者： Alexander Shadrin Yuliya Diyuk Federal State Budget Scientific Institution The Federal Research Center of Coal and Coal Chemistry of Siberian Branch of the Russian Academy of Sciences

The initial process of coal and gas sudden outburst is studied in the article when under the influence of rock and gas pressure the part of a coal seam layer(a coal section)is squeezed out from the mouth of the future outburst cavity in a jump-like manner into the ***-mechanical criterion for a part of a coal seam layer outsqueezing in the form of the relation of active(squeezing out)and passive(preventing the outsqueezing)forces is defined in the *** on it,the geophysical criterion is defined by expressing basic physical parameters through geo-physical ones:the current stress is defined by spectral-acoustic method through the ratio of high frequency and low-frequency components of an acoustic signal,which is generated into a face working space by the mining equipment operating in the face;in-situ gas pressure is defined by gas analytical method by the concentration of methane in the atmosphere of the working;the strength of the most broken coal layer is defined by a strength measuring device(a device for measuring the depth of a steal cone punched into the coal by a spring mechanism).This paper studies the influence of acoustic,strength and filtrating and collecting properties of a face working space on the limit value of an obtained geophysical criterion of pre-outburst squeezing of a coal‘‘plug”out of the mouth of the future outburst cavity into the working.

关键词： Block-like structure Criterion of a coal section outsqueezing spectral-acoustic method Stress condition Coal strength property In-situ gas pressure Aero and gas control equipment Methane concentration

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