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| Study on reasonable section coal pillar retention of steep coal seam under mountain |
| Shu Mei |
| Gui Zhou Brach,Shijiazhuang Design and Research Institute of Coal Industry Co., Ltd., Guiyang 550000, China |
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Abstract Aiming at the coal pillar instability in steep coal seam section under the mountain landform, it is easy to cause the coal pillar group linkage instability, resulting in large cracks in the roof penetrating through to the surface of the landslide and other geological disasters. Based on No. N2821 Face of Fengchun Mine in southwest China, a coal pillar stress model was established to analyze the necessary conditions and reasonable size calculation of the coal pillar instability. The Local Space-Viewer, ArcMap and Rhino3D software were comprehensively used to acquire and process terrain contours and produce 3D geomorphic grid in Fengchun Mine in southwest China, and the 3D mountain geomorphic feature numerical model was established in FLAC3D software, and then the evolution law of coal pillar bearing stress in steep coal seam section under the mountain was studied. The theoretical analysis showed that when the coal seam inclination was greater than the inverse tangent value of the sum of the friction coefficients of the upper and lower surfaces of the coal pillar, the coal pillar had sliding instability. The reasonable coal pillar size of No. N2821 Face was 12 m. The simulation results showed that with the advance of the working face, the coal pillar in the middle of the goaf was most affected by the superposition of stress, and the shear stress on the surrounding rock of the coal pillar gradually increased and concentrated towards the coal pillar. Although the plastic failure of coal pillar under the influence of mining led to the reduction of bearing stress, it still had good supporting capacity. The analysis of field monitoring data was consistent with the simulation conclusion, and the size of coal pillar was reasonable. The research results had certain reference significance for coal pillar under similar conditions.
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| [ 1 ] 黄旭超. 急倾斜煤层开采应力及裂隙演化规律研究[ J ]. 煤炭科学技术，2018，46（ S1 ）：93 - 96.
[ 2 ] 王红伟，焦建强，伍永平，等. 急倾斜厚煤层短壁综放采场承载结构泛化特征[ J ]. 煤炭科学技术，2021，49（ 11 ）：56 - 64.
[ 3 ] 黄长国，罗国辉，康建宁，等. 西南地区煤矿瓦斯灾害现状及防治对策研究[ J ]. 矿业安全与环保，2015，42（ 5 ）：112 - 115.
[ 4 ] 屠洪盛，刘送永，黄昌文，等. 急倾斜煤层走向长壁工作面底板破坏机理及稳定控制[ J ]. 采矿与安全工程学报，2022，39（ 2 ）：248 - 254.
[ 5 ] 王汉斌. 急倾斜多煤层开采诱发覆岩及地表移动规律研究[ D ]. 北京：中国地质大学（北京），2020.
[ 6 ] 伍永平，皇甫靖宇，解盘石，等. 基于大范围岩层控制技术的急倾斜煤层区段煤柱失稳机理[ J ]. 煤炭学报，2018，43（ 11 ）：3 062 - 3 071.
[ 7 ] Kumar A, Waclawik P, Singh R, et al. Performance of a coal pillar at deeper cover: field and simulation studies[ J ]. International Journal of Rock Mechanics and Mining Sciences, 2019( 113 ): 322 - 332.
[ 8 ] Das AJ, Mandal PK, Paul PS， et al. Assessment of the strength of inclined coal pillars through numerical modelling based on the ubiquitous joint model[ J ]. Rock Mechanics and Rock Engineering 2019 ( 52 ): 3 691 - 3 717.
[ 9 ] 李永明，刘长友，徐青云，等. 急倾斜煤层开采防水煤柱稳定性影响因素研究[ J ]. 煤炭科学技术，2012，40（ 12 ）：15 - 18.
[ 10 ] 徐 斌，董书宁，徐艳玲. 急倾斜煤层防水煤柱合理尺寸的理论分析[ J ]. 矿业科学学报，2017，2（ 4 ）：307 - 315.
[ 11 ] 皇甫靖宇. 大倾角煤层长壁工作面多区段开采煤柱失稳机理研究[ D ]. 西安：西安科技大学，2019.
[ 12 ] 王 琳，王广宏，董 静. 大倾角煤层长壁工作面区段煤柱尺寸留设模拟[ J ]. 矿业安全与环保，2016，43（ 6 ）：74 - 77.
[ 13 ] 屠洪盛，屠世浩，白庆升，等. 急倾斜煤层工作面区段煤柱失稳机理及合理尺寸[ J ]. 中国矿业大学学报，2013，42（ 1 ）：6 - 11，30.
[ 14 ] 易 婷. 急倾斜硬顶软底厚煤层小煤柱沿空留巷研究[ D ]. 重庆：重庆大学，2019.
[ 15 ] 王 鹏. 东林煤矿急倾斜下保护层开采区段煤柱对被保护层保护范围的影响研究[ D ]. 重庆：重庆大学，2018.
[ 16 ] 屠洪盛. 薄及中厚急倾斜煤层长壁综采覆岩运动规律与控制机理研究[ D ]. 徐州：中国矿业大学，2014.
[ 17 ] 杨 帆. 急倾斜煤层采动覆岩移动模式及机理研究[ D ]. 阜新：辽宁工程技术大学，2006.
[ 18 ] 钱鸣高，石平五，许家林. 矿山压力与岩层控制[ M ]. 徐州：中国矿业大学出版社，2010. |
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