Geophysical criterion of pre-outburst coal outsqueezing from the face space into the working
| Autor: | Yuliya Diyuk, Alexander Shadrin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
lcsh:TN1-997
0211 other engineering and technologies Energy Engineering and Power Technology 02 engineering and technology complex mixtures Signal law.invention Stress (mechanics) 020401 chemical engineering Geochemistry and Petrology law otorhinolaryngologic diseases Coal 0204 chemical engineering Spark plug lcsh:Mining engineering. Metallurgy Physics::Atmospheric and Oceanic Physics 021101 geological & geomatics engineering business.industry Process (computing) Coal mining Geophysics Geotechnical Engineering and Engineering Geology Spring (device) Current (fluid) business Geology |
| Zdroj: | International Journal of Mining Science and Technology, Vol 29, Iss 3, Pp 499-506 (2019) |
| ISSN: | 2095-2686 |
| DOI: | 10.1016/j.ijmst.2018.11.001 |
| Popis: | 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 working. Geo-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 article. Based 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. Keywords: 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 |
| Databáze: | OpenAIRE |
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