Results 41 to 50 of about 1,364 (186)
Optimizing Simulation and Analysis of Automated Top-Coal Drawing Technique in Extra-Thick Coal Seams [PDF]
Energies, 2020 A particle element approach based on continuum-discontinuum element method (CDEM) is applied to optimize the automated top-coal drawing techniques in extra-thick coal seams. Numerical models with 100 drawing openings are created according to the field engineering geological conditions of Tongxin coal mine in China.
Qunlei Zhang +5 more
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Mechanisms and influential factors of rock bursts in tunneling roadways of extra-thick coal seams [PDF]
Meitian dizhi yu kantanObjectiveRock bursts occur frequently in tunneling roadways of extra-thick coal seams, significantly constraining safe coal mining. Investigating their mechanisms and influential factors is crucial to preventing and controlling such disasters in tunneling roadways of extra-thick coal seams. MethodsFocusing on the tunneling roadway of mining face 250107-
Yujie PENG +8 more
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Study on Gas Comprehensive Control Technology in Steep and Extra Thick Coal Seam
IOP Conference Series: Earth and Environmental Science, 2021 Abstract In order to improve the gas drainage amount and drainage rate of steeply inclined and extra thick coal seam and realize the safe and efficient mining of coal mine, the distribution and evolution law of surrounding rock stress field and fracture field of horizontal slicing mining face in steeply inclined coal seam were revealed ...
Chunming Mu, Yongsan Liu
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Geofluids, 2021 Taken overlying strata of fully mechanized top coal caving mining (FMTCCM) in 15 m extra thick coal seam as the research object, the comprehensive research methods such as field investigation, theoretical calculation, and numerical analysis are used to ...
Yongqiang Zhao +3 more
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Yantu gongcheng xuebao, 2019 Taking the extra-thick coal seam heading face in Liuhuanggou Coal Mine as the engineering background, the energy accumulation characteristics and rockburst mechanism of the surrounding rock at heading face of extra-thick coal seam are studied using field
ZHU Si-tao 1, JIANG Fu-xing 1, WANG Xu-you 2, JIANG Yi-wu 2, NING Ting-zhou 2, SUN Shao-hua 2
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Failure characteristics of extra-thick coal seam under goaf based on double yield model
, 2022 This paper aims to study the influence of the goaf in the upper coal seam on the overlying ultra-thick coal seam and determine the dislocation distance in the roadway layout of the lower coal seam.
XUE Jisheng, ZHAO Tielin, PAN Liming
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Applied Sciences, 2021 The higher strength of a hard roof leads to higher coal pressure during coal mining, especially under extra-thick coal seam conditions. This study addresses the hard roof control problem for extra-thick coal seams using the air return roadway 4106 (AR ...
Zhe Xiang +4 more
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Energy Exploration & Exploitation, 2023 To ensure gas control in the layered mining of extra-thick coal seams in Baijigou Coal Mine—in addition to reducing the loss of coal resources and amount of roadway driving—this article proposes the gob-side entry retention technology of flexible ...
Xiaofan Cao +6 more
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Research on Top Coal Caving Technique in Steep and Extra-Thick Coal Seam
Procedia Earth and Planetary Science, 2011 AbstractReasonable caving method is an important guarantee of realizing high-yield and high-efficient of the working face. Based on the specific conditions of the 2637 working face in Zhaogezhuang Mine, compared extraction rates under different top coal caving technology with field tests and similar material simulation, adopted the multi-turns interval
Zhang, Juguo, Zhao, Zhiqiang, Gao, Yang
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Meitan kexue jishu, 2023 Affected by the superposition of working face mining, strong rock pressure phenomena such as rock burst and large deformation easily occur in the gob-side entry when mining extra-thick coal seams. Taking the extra-thick coal seam mining of Caojiatan Coal
GAO Yubing +5 more
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