Support Technology of Limestone Roof Roadway in Qiuji Coal Mine

The safety production pressure in coal mines is huge, and there is a general phenomenon of over-supporting in roadways. Even hard and dense thick limestone roofs do not dare to be unsupported. 1102 track roadways of Qiuji Coal Mine is taken as the engineering background, by constructing a hard roof...

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Bibliographic Details
Published inMei kuang an quan Vol. 51; no. 12; pp. 93 - 99
Main Author WU Shanyuan, ZHU Qingwen, YUN Ming, LI Tingchun, XU Qingguo, GUO Hongyun
Format Journal Article
LanguageChinese
Published Editorial Office of Safety in Coal Mines 01.12.2020
Subjects
hard roof
numerical simulation
roadway support
stability
theoretical analysis
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Summary:The safety production pressure in coal mines is huge, and there is a general phenomenon of over-supporting in roadways. Even hard and dense thick limestone roofs do not dare to be unsupported. 1102 track roadways of Qiuji Coal Mine is taken as the engineering background, by constructing a hard roof deformation analysis model, quantifying the role of the fifth layer limestone thickness in controlling roadway deformation, using numerical simulation to verify theoretical calculation results, using field test and monitoring reinspection research results. The research shows that as the thickness of limestone increases, the roof deformation decreases continuously and the self-stability of the roadway increases. When the thickness of the fifth layer limestone reaches 1.5 m, the deformation of the roof is reduced by 77.4% compared with the thickness of 0.2 m, and the plastic zone is reduced by 40.5%. The thickness of the fifth layer of limestone in 1102 track roadway is greater than 1.5 m. The scheme of without suppo
ISSN:1003-496X
DOI:10.13347/j.cnki.mkaq.2020.12.017