Kurnosov S.A., Zerkal V.V. About trends of improvement of technological schemes for methane recovery from the rock-coal massif
- Details
- Parent Category: Geo-Technical Mechanics, 2019
- Category: Geo-Technical Mechanics, 2019, Issue 146
Geoteh. meh. 2019, 146, 50-60
https://doi.org/10.1051/e3sconf/201910900046
About trends of improvement of technological schemes for methane recovery from the rock-coal massif
1Kurnosov S.A.,2Zerkal V.V.
1Institute of Geotechnical Mechanics named N. Poljakov of National Academy of Sciences of Ukraine, 2Private Joint Stock Company «DTEK Pavlogradugol»
UDC 622.831.325.3
Language: English
Abstract.
Modern technologies of underground coal mining in flat seams and technical feasibility of the state-of-the-art mining equipment are very important nowadays. The purpose of the presented investigation is connected with the improving of underground gas drainage efficiency from the rock-coal massif. In the Ukrainian mines, underground gas drainage from the rock-coal massif is, in most cases, carried out from the preparatory roadways, which are also used in technological processes of coal mining in underground conditions. Such combination impedes effective performance of these works. In addition, the preparatory roadways are located in zone with active influence of longwall; therefore, they are subject to significant deformations. It is substantiated that most promising solution of the problem of increasing efficiency of gas drainage from the massif is to mine additional gas-drainage roadway. This approach allows separating processes of coal mining and methane recovery in space and time. The Ukrainian normative documents recommend to arrange the roadway behind zones with high rock pressure. We found that in difficult conditions of the coal seam mining, distance from roadway to the working longwall would be more than 100 m. This distance reduces the efficiency of gas drainage and is not economically feasible due to significant length of the gas-drainage boreholes and air breakthroughs.
Therefore, the gas-drainage roadway should be located as close to the working longwall as possible, but with possibility to ensure its stability during its entire service life. At the same time, it is necessary to reinforce the road support.
Experimental researches were conducted in the Zasyadka Mine and in the Krasnolymanska Mine. It was established that with increasing distance from the working wall to the location of gas-drainage roadway in the massif unloaded by the underworking, displacements of the roadway contour decreases, and methane flow rate increases in power dependencies. Using these results make it possible to calculate the rational location for the gas-drainage roadway with more accurance.
Keywords: gas-drainage schemes, long-pillar method for mining coal seams,stress-strain state of the rock massif, ensure of road stability.
REFERENCES
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About the authors
Kurnosov Serhii Anatoliiovych,Doctor of Technical Sciences (Ph.D.), Senior Researcher, Senior Researcher in the Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .
Zerkal Volodymyr Viktorovych, Master of Science, Deputy Chief Engineer for the Production of the Mine Department "Pershotravenske" PrJSC "DTEK Pavlorhradvugilla", Pavlohrad, Ukraine
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