坚硬顶板条件下厚煤层沿空留巷最优巷高参数研究
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摘要
采用理论分析和数值模拟的方法研究了沙曲矿坚硬顶板条件下厚煤层沿空留巷最优巷高问题。通过理论分析,分析了坚硬顶板条件下厚煤层沿空留巷顶板断裂运动规律;运用数值模拟方法,确定合理采高(留巷高度)为4.5 m。结果表明:采高为4.5 m时,沙曲矿沿空留巷体系整体变形量较小,巷道变形稳定后具有较高的有效使用断面,巷道围岩承载结构更加稳定,留巷体系的稳定性得到有效的提升。说明坚硬顶板条件下厚煤层沿空留巷存在着最优的留巷高度。
The optimal roadway height of gob-side entry retaining in thick coal seam is studied by theoretical analysis and numerical simulation under the condition of hard roof in Shaqu Coal Mine. Through theoretical analysis, the roof fracture motion law of gob-side entry retaining in thick coal seam under the condition of hard roof is analyzed. The reasonable mining height(roadway height) was determined to be 4.5 m by numerical simulation. The results show that, when the mining height is 4.5 m,the overall deformation of gob-side entry retaining system is small, the roadway deformation is stable and has a higher effective section, the surrounding rock bearing structure of the roadway is more stable, and the stability of the roadway retaining system is effectively improved. It is proved that there is an optimal roadway height of gob-side entry retaining in thick coal seam under the condition of hard roof.
The optimal roadway height of gob-side entry retaining in thick coal seam is studied by theoretical analysis and numerical simulation under the condition of hard roof in Shaqu Coal Mine. Through theoretical analysis, the roof fracture motion law of gob-side entry retaining in thick coal seam under the condition of hard roof is analyzed. The reasonable mining height(roadway height) was determined to be 4.5 m by numerical simulation. The results show that, when the mining height is 4.5 m,the overall deformation of gob-side entry retaining system is small, the roadway deformation is stable and has a higher effective section, the surrounding rock bearing structure of the roadway is more stable, and the stability of the roadway retaining system is effectively improved. It is proved that there is an optimal roadway height of gob-side entry retaining in thick coal seam under the condition of hard roof.
引文
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[13]王永志.坚硬厚层顶板工作面沿空留巷技术研究[J].煤矿开采,2017,22(5):53-56.
[14]池秀文,张文举,张九雨.坚硬顶板下“有限变形”巷旁支护沿空留巷[J].煤矿安全,2017,48(10):191.
[15]李迎富,华心祝,蔡瑞春.沿空留巷关键块的稳定性力学分析及工程应用[J].采矿与安全工程学报,2012,29(3):357-364.
[2]张九雨.薄煤层厚灰岩下混凝土巷旁充填沿空留巷研究[J].煤矿安全,2016,47(9):46-49.
[3]仝晓军,杨双锁,崔立文.中厚煤层膏体巷旁充填沿空留巷技术[J].煤矿安全,2016,47(6):86-89.
[4]薛俊华,韩昌良.大采高沿空留巷围岩分位控制对策与矿压特征分析[J].采矿与安全工程学报,2012,29(4):466-473.
[5]华心祝,马俊枫,许庭教.锚杆支护巷道巷旁锚索加强支护沿空留巷围岩控制机理研究及应用[J].岩石力学与工程学报,2005,24(12):2107-2112.
[6]谢生荣,许磊,张广超,等.深部大采高沿空留巷围岩结构沉降破坏与控制[J].岩土力学,2015(2):569.
[7]韩昌良,张农,李桂臣,等.大采高沿空留巷巷旁复合承载结构的稳定性分析[J].岩土工程学报,2014,36(5):969-976.
[8]冯吉成,马念杰,赵志强,等.深井大采高工作面沿空掘巷窄煤柱宽度研究[J].采矿与安全工程学报,2014,31(4):580-586.
[9]许永祥.特厚煤层大采高综放面沿空掘巷支护技术[J].煤矿开采,2017,22(2):51-55.
[10]张东升,缪协兴,冯光明,等.综放沿空留巷充填体稳定性控制[J].中国矿业大学学报,2003,32(3):232.
[11]谢文兵.综放沿空留巷围岩稳定性影响分析[J].岩石力学与工程学报,2004,23(18):3059-3065.
[12]姚亚虎,张庆华.千米埋深坚硬顶板沿空留巷技术研究[J].煤炭科学技术,2017,45(5):86-91.
[13]王永志.坚硬厚层顶板工作面沿空留巷技术研究[J].煤矿开采,2017,22(5):53-56.
[14]池秀文,张文举,张九雨.坚硬顶板下“有限变形”巷旁支护沿空留巷[J].煤矿安全,2017,48(10):191.
[15]李迎富,华心祝,蔡瑞春.沿空留巷关键块的稳定性力学分析及工程应用[J].采矿与安全工程学报,2012,29(3):357-364.