Abstract
To solve the problem of strong mine ground pressure around the roadway in Carboniferous working face under Jurassic coal pillar in Tongxin Coal Mine, based on theoretical analysis and FLAC3D numerical simulation, the stress distribution characteristics of working face and 38 m width large-coal-pillar roadway were studied, the influencing mechanism of the remaining Jurassic coal pillar was elucidated, a method of using the small-coal-pillar of gob-side entry driving is proposed, and a reasonable width of coal pillar and the stress distribution characteristics of 6-m-width small-coal-pillar roadway were analyzed. The results show that the concentration stress of remaining Jurassic coal pillar is 23 MPa, the stress concentration coefficient is 2.7, and under static load, the maximum influencing depth is up to 128 m. During the mining in Carboniferous working face, the main key stratum is broken, the development height of roof fractured zone penetrating the affected zone of concentrated stress under the remaining Jurassic coal pillar. This leads to the structural instability of the remaining coal pillar and the downward transfer of concentrated load. As a result, the effect of coal pillar on the Carboniferous working face and roadway changed from static load to dynamic load impact, eventually leading to severe pressure behavior in the Carboniferous working face and large-coal-pillar roadway. Under the influence of remaining coal pillar, the stress of Carboniferous working face and surrounding rock of roadway significantly increased during the mining, and the peak stress in the front section of large-coal-pillar roadway reached up to 38.3 MPa. The results show that mining roadway is arranged with small-coal-pillar, significantly reducing the influence of roadway on the remaining Jurassic coal pillar. The practice shows that a small-coal-pillar roadway with reasonable support can effectively control the deformation of roadway surrounding rocks under the mining and stratum conditions.
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The authors are grateful to the editors and the anonymous reviewers for their helpful comments on the manuscript.
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This research was supported by the Datong Basic Research Project (2019122) and Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (2019L0754).
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Responsible editor: Zeynal Abiddin Erguler
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Duan, H., Zhao, L. Gob-side entry driving with small-coal-pillar for Carboniferous extra thick coal seam under Jurassic coal pillar. Arab J Geosci 15, 935 (2022). https://doi.org/10.1007/s12517-022-10234-y
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DOI: https://doi.org/10.1007/s12517-022-10234-y