兴安矿段间无煤柱开采对采空区注氮效果的影响
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摘要
为提高兴安矿四水平11煤层中部二段工作面段间无煤柱开采形成的大面积复合采空区的注氮效果,使用FLAC~(3D)数值模拟软件开展应力分布模拟,使用COMSOL软件建立采空区注氮防灭火数值模拟模型,开展注氮效果数值模拟,分析煤柱宽度与应力分布的关系及不同注氮方式下采空区自燃三带分布情况。模拟结果表明:段间无煤柱开采可有效降低煤体应力,降低冲击地压危险性,但会形成大面积复合采空区,使本采空区氧化带宽度增加,老采空区形成复燃氧化带,注氮后高浓度氮气积聚区域减小,防灭火效果显著降低。对老采空区进行灌浆增阻,并增大注氮口距离和注氮量,有助于提高注氮效果,局部未完全充填区域可以配合使用钻孔压注氮气,显著提高无煤柱开采综合注氮防灭火效果。
In order to improve the effect of nitrogen injection in large composite goaf of the two-stage middle working face in the fourth level 11 floor of Xing'an Coal Mine,FLAC~(3D) numerical simulation software was used to carry out stress distribution simulation,and COMSOL software was used to establish a numerical simulation model of nitrogen injection and fire prevention in goaf,and to carry out numerical simulation of nitrogen injection effect. The relationship between coal pillar width and stress distribution and the three zones of spontaneous combustion under different nitrogen injection modes in goaf were analyzed. The simulation results show that non-pillar mining between sections can effectively reduce the coal stress and the risk of rock burst.However,a large area of compound goaf will be formed,which will increase the width of oxidation zone in this goaf and form a reburning oxidation zone in the old goaf. After nitrogen injection,the accumulation area of high concentration nitrogen will be reduced,and the fire prevention effect will be significantly reduced. It is helpful to improve the effect of nitrogen injection by prevent grouting in the old goaf,and increasing the distance of nitrogen injection port and nitrogen injection quantity,borehole pressure injection of nitrogen can be used in the partial incomplete filling area,the fire prevention effect of comprehensive nitrogen injection of non-pillar mining is improved remarkably.
In order to improve the effect of nitrogen injection in large composite goaf of the two-stage middle working face in the fourth level 11 floor of Xing'an Coal Mine,FLAC~(3D) numerical simulation software was used to carry out stress distribution simulation,and COMSOL software was used to establish a numerical simulation model of nitrogen injection and fire prevention in goaf,and to carry out numerical simulation of nitrogen injection effect. The relationship between coal pillar width and stress distribution and the three zones of spontaneous combustion under different nitrogen injection modes in goaf were analyzed. The simulation results show that non-pillar mining between sections can effectively reduce the coal stress and the risk of rock burst.However,a large area of compound goaf will be formed,which will increase the width of oxidation zone in this goaf and form a reburning oxidation zone in the old goaf. After nitrogen injection,the accumulation area of high concentration nitrogen will be reduced,and the fire prevention effect will be significantly reduced. It is helpful to improve the effect of nitrogen injection by prevent grouting in the old goaf,and increasing the distance of nitrogen injection port and nitrogen injection quantity,borehole pressure injection of nitrogen can be used in the partial incomplete filling area,the fire prevention effect of comprehensive nitrogen injection of non-pillar mining is improved remarkably.
引文
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[15]董子文,吴宪,齐庆杰,等.不同堆放条件下煤堆压实最低不适用风速研究[J].热能动力工程,2016,31(10):63-71.
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[18]董子文,刘爱群,齐庆杰,等.采场气体涌出与煤自燃的动态数值模拟研究[J].中国安全科学学报,2017,27(7):30-35.
[2]曹建军.深井采场沿空掘巷关键技术研究[D].青岛:山东科技大学,2008.
[3]朱红青,刘星魁.顶煤自燃危险性分析及注氮防火的理论研究[J].煤炭学报,2012,37(6):1015-1020.
[4]张红芬.煤自燃特性与巷道松散煤体自燃三维多场耦合研究[D].北京:中国矿业大学(北京),2016.
[5]余明高,鲁来祥,常绪华,等.煤巷高冒区遗煤自燃数值模拟分析[J].防灾减灾工程学报,2009,29(6):658-662.
[6]别小飞,张清宣,庞招辉,等.千秋煤矿21141综放工作面煤层自燃和瓦斯治理技术[J].煤矿安全,2013,44(9):95-97.
[7]苑铎,张清宣,宣德全,等.容易自燃厚煤层开采期间自然发火特点分析及防治对策[J].西部探矿工程,2014,26(3):135-138.
[8]孟现臣.深部开采综放工作面煤层自燃防治技术[J].矿业安全与环保,2010,37(1):72-74.
[9]石琨.松软破碎易自燃突出厚煤层沿空掘巷技术[J].煤炭科学技术,2013,41(10):49-52.
[10]马驰,王永保,曹平小,等.深井易自燃煤层沿空掘巷预留窄煤柱煤自燃防治技术[J].安徽建筑工业学院学报(自然科学版),2011,19(1):37-39.
[11]邓军,徐精彩,张辛亥,等.东滩矿4308综放面沿空巷道自然发火预测[J].矿业安全与环保,2001,28(1):8-10.
[12]邓军,徐精彩,王洪权,等.新型复合胶体防灭火技术及应用[J].煤矿安全,2001,32(12):42-43.
[13]韦玉沛,冯学武,吴吉南.姚桥煤矿综放面沿空掘巷防灭火技术[J].煤炭科学技术,2001,29(12):7-9.
[14]郭兴明,徐精彩,惠世恩.巷道煤体漏风规律研究[J].西安交通大学学报,2001,35(3):239-243.
[15]董子文,吴宪,齐庆杰,等.不同堆放条件下煤堆压实最低不适用风速研究[J].热能动力工程,2016,31(10):63-71.
[16]董子文,吴宪,齐庆杰,等.风障联合压实防治煤堆自燃技术工艺参数优化[J].中国安全生产科学技术,2016,12(3):15-20.
[17]董子文.基于变形几何的动态采空区气体涌出及自燃演化规律研究[D].阜新:辽宁工程技术大学,2016.
[18]董子文,刘爱群,齐庆杰,等.采场气体涌出与煤自燃的动态数值模拟研究[J].中国安全科学学报,2017,27(7):30-35.