浅埋深煤层长壁式复采区段煤柱稳定性研究
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摘要
为确定浅埋深煤层房柱式开采转长壁开采时区段煤柱的形式和稳定性,采用理论计算的方法,分析了已有房柱式开采区域内复采时区段煤柱的类型、受力特征及稳定性,提出了煤柱受力模型,并给出了不充填两柱一巷式、不充填三柱两巷式、充填两柱一巷式、充填三柱两巷式等4种煤柱的有效支撑宽度计算公式。以鄂尔多斯弓家塔煤矿为研究对象,计算了4种区段煤柱的失稳系数。结果表明:不充填型和充填型两柱一巷式、不充填型三柱二巷式区段煤柱失稳系数大于或接近1,存在失稳的危险性,充填型三柱二巷式区段煤柱失稳系数为0.64~0.87,可以保证长壁工作面开采时的区段煤柱的稳定性,满足了安全生产需要,最大限度地提高煤炭采出率。
In order to determine the type and stability of the district sublevel pillars in shallow coal seam when converting room-and-pillar mining into longwall mining,the theoretical calculation method was adopted to analyze the type,mechanical characteristics and stability of the segment pillars during repeated mining in the room-and-pillar mining area and the mechanical model of the pillar was established,and effective bearing width calculation formulas of four different types of segment pillar were presented: two-pillar-and-one-roadway without backfilling,three-pillar-and-two-roadway without backfilling,two-pillar-and-one-roadway with backfilling,and three-pillar-and tworoadway with backfilling. Taking Gongjiata Coal Mine in Erdos area as the research object,the instability coefficient of the four kinds of segment pillars were obtained. The results indicated that the instability coefficient of two-pillar-and-one-roadway segment pillars with and without backfilling and three-pillar-and-two-roadway segment pillars without backfilling was greater than or near 1,which meant instability risk. The results also showed that the instability coefficient of the three-pillar-and-two-roadway segment pillars was 0. 64 ~ 0. 87. It could ensure pillars were stable during longwall mining,which could meet the requirements of mining safety and maximize the coal production.
In order to determine the type and stability of the district sublevel pillars in shallow coal seam when converting room-and-pillar mining into longwall mining,the theoretical calculation method was adopted to analyze the type,mechanical characteristics and stability of the segment pillars during repeated mining in the room-and-pillar mining area and the mechanical model of the pillar was established,and effective bearing width calculation formulas of four different types of segment pillar were presented: two-pillar-and-one-roadway without backfilling,three-pillar-and-two-roadway without backfilling,two-pillar-and-one-roadway with backfilling,and three-pillar-and tworoadway with backfilling. Taking Gongjiata Coal Mine in Erdos area as the research object,the instability coefficient of the four kinds of segment pillars were obtained. The results indicated that the instability coefficient of two-pillar-and-one-roadway segment pillars with and without backfilling and three-pillar-and-two-roadway segment pillars without backfilling was greater than or near 1,which meant instability risk. The results also showed that the instability coefficient of the three-pillar-and-two-roadway segment pillars was 0. 64 ~ 0. 87. It could ensure pillars were stable during longwall mining,which could meet the requirements of mining safety and maximize the coal production.
引文
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[13]孔令海,姜福兴,刘杰,等.特厚煤层综放工作面区段煤柱合理宽度的微地震监测[J].煤炭学报,2009,34(7):871-874.
[2]石亮,邢桂新,徐鹏飞.区段煤柱合理尺寸数值模拟研究[J].煤,2010,19(9):10-11.
[3]朱泽阳,李芳.浅埋深工作面区段煤柱合理留设的探讨[J].煤炭科学技术,2008,36(8):12-14.
[4]张开智,郭周克,程秀洋,等.坚硬顶板煤柱稳定性实测分析[J].煤炭科学技术,2002,30(4):12-15.
[5]石平五,刘洋,张嘉凡.浅埋区小煤矿发展长壁开采的技术途径[J].煤矿开采,2005,10(2):1-2.
[6]翟新献,邵强,王克杰,等.复采残采煤层小煤矿开采技术研究[J].中国安全科学学报,2004,14(4):47-50.
[7]戴华阳,王金庄.非充分开采地表移动预计模型[J].煤炭学报,2003,28(6):583-587.
[8]翟新献,钱鸣高,李化敏,等.小煤矿复采煤柱塑性区特征及采准巷道支护技术[J].岩石力学与工程学报,2004,23(22):3799-3802.
[9]蒋济联.浅谈近水平煤层房柱式开采煤柱留设尺寸的确定[J].煤矿安全,2005,36(5):27-29.
[10]董文敏.高瓦斯矿大采高工作面区段煤柱尺寸合理确定[J].煤炭科学技术,2007,35(12):67-70.
[11]柏建彪,侯朝炯,黄汉富.沿空掘巷窄煤柱稳定性数值模拟研究[J].岩石力学与工程学报,2004,23(20):3475-3479.
[12]刘金海,姜福兴,王乃国,等.深井特厚煤层综放工作面区段煤柱合理宽度研究[J].岩石力学与工程学报,2012,31(5):921-927.
[13]孔令海,姜福兴,刘杰,等.特厚煤层综放工作面区段煤柱合理宽度的微地震监测[J].煤炭学报,2009,34(7):871-874.
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