Mechanical analysis and application of floor failure mechanism under repeated mining in close-distance coal seams. [PDF]
Sci RepThe stress state of primary rocks is redistributed during coal mining, which leads to deformation and failure of the floor strata. Coal seam floor experiences repeated additional stress from the mining of two overlying seams in close-distance mining.
Li Y, Yao Y, Zhu T, Zeng F, Chang G.
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Cooperative mining technology and strata control of close coal seams and overlying coal pillars
Alexandria Engineering Journal, 2023 Mining of close coal seams envisages reservation of a large number of section coal pillars of a total width ranging from 30 to 40 m. This results in an enormous waste of coal resources and risks of spontaneous combustion, instability, and damage to the ...
Sun Qiang +3 more
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Distribution Law of Spontaneous Combustion Hazard of Coal in Lower Goaf of Close Distance Coal Seams
Meikuang Anquan, 2020 In view of the objective conditions of high sulfur content and local enrichment, large amount of residual coal and closing to upper goaf of coal seams in the 8104 fully mechanized coal mining face of Xinwei Coal Mine, the distribution law of coal ...
JIAO Gengxin, BAI Chengwu, QI Xuyao, QIAO Shi, CHEN Liangzhou, LI Xuewen, JI Youcang, CHEN Liang, SONG Runquan
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Study on Coal Pillar Setting and Stability in Downward Mining Section of Close Distance Coal Seam
EnergiesTo investigate the reasonable width of a coal pillar in the downward mining section of close-distance coal seams, the stress state of any point below the residual coal pillar in the overlying goaf and the width of a small coal pillar were studied by ...
Longpei Ma, Chongyan Liu, Guangming Zhao
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Study on the Stability of Adjoining Rock of Lower Roadway in Close Distance Coal Seam Mining
Shock and VibrationTo address the issue of mutual disturbance between coal seams in close-proximity coal seam mining, this study examines the opposite excavation of the 10,205 working face and the 20,203 mining roadway in the Longhua Coal Mine.
Jie Zhang +8 more
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Meikuang Anquan, 2022 The coal seam group in the outburst mine has the characteristics of mutual influence in the mining process, the goaf is connected, there are many air leakage places, and the fire prevention work is difficult.
DONG Xiaoming +4 more
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Optimizing roadway location and cross section under superposition of residual coal pillars and adjacent goafs in close distance coal seams [PDF]
Scientific ReportsThe residual coal pillar and adjacent goafs in the upper coal seam have a superposition effect on the stress environment of the lower coal seam in close distance coal seams with downward mining.
Yuqi Ren +4 more
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Meitian dizhi yu kantanBackgroundIn the Jurassic coalfield of northern Shaanxi Province, the repeated mining of close-distance coal seams exacerbates the activation of fractures in the overburden.
Jian CAO +5 more
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Research on surrounding rock control technology for gob-side entry in close-distance lower coal seam. [PDF]
Sci RepResearch on the surrounding rock control technology of along-the-gob roadways in close-distance lower coal seams of the Xiaoyu Mine in Shuozhou City, Shanxi Province, is conducted using theoretical analysis, numerical simulation, field application, and effect monitoring.
Li S, Wang Z.
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Study on the influence of stress relief in close-distance coal seam Goaf and roadway excavation disturbance on surrounding rock. [PDF]
Sci RepAbstract To investigate the influence of pressure relief in close-distance coal seam goaf and roadway excavation disturbance on surrounding rock stability, this study takes the large-section open-off cut of Ⅱ8224N as the research object and employs methods including RQD rock mass quality evaluation, FLAC3D numerical simulation, similar ...
Liu Z, Chen M.
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