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      Numerical Study on Soft Coal Pillar Stability in an Island Longwall Panel

      1 , 2 , 1 , 3 , 1 , 1 , 4
      Advances in Civil Engineering
      Hindawi Limited

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          Abstract

          Roadway support and management of longwall panels in an island soft coal panel are always difficult work. In a test mine, stress distribution, deformation characteristic, and plastic zone distribution around the roadway and coal pillars in the development and mining periods were investigated with respect to the widths of different coal pillars using theoretical and simulation methods. The most reasonable width of coal pillars was comprehensively determined, and the field test was conducted successfully. The results show that a reasonable width of coal pillars is 7.0–8.2 m using the analytical method. The distribution of vertical stress in the coal pillars showed an asymmetric “double-hump” shape, in which the range of abutment pressure was about 26.0–43.0 m, and the roadway should be laid away from stress concentration. When the coal pillar width is 5.0–7.0 m, deformation of the roadway is half that with 8.0–10.0 m coal pillar in the development and mining period. The plastic zone in the surrounding rock firstly decreases and increases with increasing coal pillar width; the smallest range occurs with a coal pillar width of 5.0 m. Finally, a reasonable width for coal pillars in an island panel was determined to be 5.0 m. Industrial practice indicated that a coal pillar width of 5.0 m efficiently controlled deformation of the surrounding rock, which was an important basis for choosing the width of coal pillars around gob-side entries in island longwall panels with similar geological conditions.

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          Most cited references17

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          Study of influential factors on the stability of narrow coal pillar in gob-side entry driving and its engineering application

          X. Li, X Li, Li (2016)
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            Stress Distribution of Coal Pillar with Gob-Side Entry Driving in the Process of Excavation & Mining

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              • Abstract: not found
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              Roof mechanics analysis and backfill technology for abandoned roadway

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                Author and article information

                Contributors
                Journal
                Advances in Civil Engineering
                Advances in Civil Engineering
                Hindawi Limited
                1687-8094
                1687-8086
                January 29 2021
                January 29 2021
                : 2021
                : 1-13
                Affiliations
                [1 ]State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
                [2 ]School of Coal Engineering, Shanxi Datong University, Datong, Shanxi 037003, China
                [3 ]Institute of Mining Engineering and Geology, Xinjiang Institute of Engineering, Urumqi, Xinjiang 830091, China
                [4 ]Beijing Research Institute of Uranium Geology, Beijing 100029, China
                Article
                10.1155/2021/8831778
                4ecfe68f-0d76-43f6-bc5f-a2d98cba933f
                © 2021

                https://creativecommons.org/licenses/by/4.0/

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