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- Title
Research and application of goaf gas source identification technology based on the carbon–hydrogen isotope tracer.
- Authors
Xue, Junhua; Du, Xuanhong; Ma, Qian; Chen, Zhiheng
- Abstract
Under the condition of coal seam group occurrence, the gas sources in goaf cannot be determined when the protective coal seam is mined. To achieve the purpose of efficient gas control, it is necessary to analyze the gas sources in goaf in advance and carry out gas control for different gas sources. In this paper, the composition and stable carbon and hydrogen isotopes of desorption gases in main coal seams were tested and analyzed. Also, the gas sources and gas composition in the goaf of the protective coal seam are analyzed by establishing a quantitative identification model of mixed gas volume ratio. Gas source of the protective coal seam goaf is mainly M3 coal seam, accounted for 90%, M2 coal seam accounts for 9% on average, while M1 coal seam accounts for 1% on average, which indicates that the pressure-relief gas of M1 coal seam cannot enter goaf of M2 coal seam during M2 coal seam mining. This phenomenon makes M1 coal seam gas content constant and poses a safety risk of gas emission to the M1 coal seam. Therefore, the pressure-relief gas of the upper M1 coal seam has to be extracted to eliminate the hidden gas hazards when mining M2 coal seam (protective coal seam). Through the analysis of gas extraction concentration, it is found that after the formation of gas migration channels that used for gas flowing in the M1-protected coal seam, the migration channels can at least maintain until the working face of M2 protective coal seam is mined 350 m; this study can provide a certain reference for the gas control technology in protected coal seam under the condition of coal seam group mining.
- Publication
Arabian Journal of Geosciences, 2022, Vol 15, Issue 3, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-022-09569-3