Results 21 to 30 of about 48,246 (256)
A fully multifield coupling model of gas extraction and air leakage for in-seam borehole
Energy Reports, 2021 Air leakage around the in-seam borehole leads to a poor quality of gas extracted, thus gas outburst danger is difficult to eliminate but also may cause other disasters, such as coal spontaneous combustion and gas explosion.
Junxiang Zhang +4 more
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Influence of Deformation and Instability of Borehole on Gas Extraction in Deep Mining Soft Coal Seam
Advances in Civil Engineering, 2021 To study the effects of the three deformation instability modes of gas drainage borehole on gas drainage, the deformation instability mechanism of soft coal seams is analyzed, three deformation instability modes are proposed for soft coal seams, namely ...
Xue-Bo Zhang +4 more
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Dynamic leakage mechanism of gas drainage borehole and engineering application
International Journal of Mining Science and Technology, 2018 Borehole leakage not only affects the gas drainage effect but also presents considerable risk to human security. For the research on the leakage mechanism of gas drainage borehole, the rheological and visco-elastic-plastic characteristics were considered
Zhang Junxiang, Li Bo, Sun Yuning
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Energy Science & Engineering, 2023 Gas drainage is an important measure to ensure energy safety in coal mines. However, for mines with high gas content and low permeability, the critical question is how to enhance the drainage effect of drilling.
Xi Jie +3 more
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Gas control technology of directional high-level long borehole at upper corner
Gong-kuang zidonghua, 2020 For problems that normal roof high-level borehole hardly drilled to design position because borehole direction and dip-angle cannot be controlled, and had short effective extraction hole segment, many drainage blind areas, discontinuous drainage and so ...
BAI Gang, YANG Zhong, DUAN Huiju
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Application of gas drainage technology with separated sources in steep thick seam
Gong-kuang zidonghua, 2014 In order to solve problems of gas overrunning in No.735 Coal Mining Face of Dahuangshan Mine, a gas drainage technology with separated sources was put forward based on analysis of main sources of gas emission of the coal mining face, that is, gas in goaf
CHEN Xinrun, HOU Tiejun, ZHAO Yunfeng
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Study on Gas Control in Goaf of High Gas Coal Seam: A Case Study of Tingnan Coal Mine, China
Geofluids, 2022 When stratified mining is used in extrathick coal seam, the gas emission in goaf of the first mining face is large, and it is easy to cause gas overrun in the upper corner during the rapid advance of the working face, which seriously affects the safe and
Jiamei Chai
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Research on effective drainage radius and rational borehole spacing of parallel boreholes
Gong-kuang zidonghua, 2019 In order to determine rational borehole spacing of parallel boreholes for gas drainage, a fluid-solid coupling model of gas drainage was established by deducing gas migration equation of coal seam, deformation equation of coal and rock, and coupling ...
SANG Naiwen, YANG Shengqiang, SONG Yawei
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Research and application of intelligent decision-making platform for gas excavation from standard
Meikuang Anquan, 2022 In order to solve the defects of low intelligence in gas drainage and control, imperfect gas prevention and control information, and ignoring data analysis and situation prediction in gas drainage model, a set of intelligent decision-making platform for
10.13347/j.cnki.mkaq.2022.03.017 +6 more
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Shigen-to-Sozai, 1993 Continuous measurements related to gas drainage and cuttings volume at boring were carried out at 20 in-seam boreholes of No.3 slope area in Minami-Oyubari coal mine, which contained the virgin area, influence area due to cross measure boreholes from another rock road, and influence area due to boreholes of previous boring base.The results obtained ...
Tomohiro MURAKAMI +2 more
openaire +3 more sources