基于COMSOL的采空区瓦斯抽采数值模拟研究
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摘要
为了研究采空区内瓦斯达到稳定后的分布规律,从而确定瓦斯抽采巷道的位置,结合孔庄煤矿7433工作面实例,基于"O型圈"理论,采用分块赋值孔隙率的方法,通过COMSOL有限元分析软件对采空区瓦斯分布规律进行了数值模拟。模拟结果表明:工作面漏风不断流入采空区与瓦斯持续解吸涌出形成了1个动态平衡结果;7433工作面回采至180 m处时瓦斯富集,可以确定瓦斯抽采巷处于裂隙带上,瓦斯抽采巷道内错距离在10~30 m范围时抽采效果达到最优。
In order to study the distribution law of gas in goaf and to determine the location of gas extraction roadway, taking 7433 working face of Kongzhuang Coal Mine as an example, based on the "O type circle"theory, adopting the method of partition assignment porosity, we carry out the numerical simulation on distribution of gas in goaf through the finite element analysis software COMSOL. The simulation results show that there is a dynamic equilibrium result between the leakage flow of the working face and the continuous discharge of gas; gas is enriched when 7433 working face advances to 180 m, which determines that the gas extraction roadway is in the crack zone, so the extraction effect is optimal when the inner alternated distance in the gas extraction roadway is within 10 m to 30 m range.
In order to study the distribution law of gas in goaf and to determine the location of gas extraction roadway, taking 7433 working face of Kongzhuang Coal Mine as an example, based on the "O type circle"theory, adopting the method of partition assignment porosity, we carry out the numerical simulation on distribution of gas in goaf through the finite element analysis software COMSOL. The simulation results show that there is a dynamic equilibrium result between the leakage flow of the working face and the continuous discharge of gas; gas is enriched when 7433 working face advances to 180 m, which determines that the gas extraction roadway is in the crack zone, so the extraction effect is optimal when the inner alternated distance in the gas extraction roadway is within 10 m to 30 m range.
引文
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[2]程卫民,孙路路,王刚.急倾斜特厚煤层开采相似材料模拟试验研究[J].采矿与安全工程学报,2016,33(3):387-392.
[3]孙路路,程卫民,武猛猛,等.基于Mohr-Coulomb准则的含瓦斯煤层巷帮侧塑性区宽度的探讨[J].采矿与安全工程学报,2017,34(5):955-961.
[4]金龙哲,姚伟,张君.采空区瓦斯渗流规律的CFD模拟[J].煤炭学报,2010,35(9):1476-1480.
[5]李宗翔,顾润红,张晓明.基于RNGk-ε湍流模型的3D采空区瓦斯上浮贮移[J].煤炭学报,2014,39(5):880-885.
[6]李东印,许灿荣,熊祖强.采煤工作面瓦斯流动模型及COMSOL数值解算[J].煤炭学报,2012,37(6):967.
[7]狄军贞,刘建军.基于COMSOL Multiphysics的煤层甲烷拟稳态吸附-运移数值模拟[J].中国煤层气,2007,4(3):25-27.
[8]Gang Wang,Mengmeng Wu,Rui Wang,et al.Height of the mining-induced fractured zone above a coal face[J].Engineering Geology,2017,216:140-152.
[9]王刚,沈俊男,褚翔宇.基于CT三维重建的高阶煤孔裂隙结构综合表征和分析[J].煤炭学报,2017,42(8):2074-2080.
[10]高光超,李宗翔,张春.基于三维“O”型圈的采空区多场分布特征数值模拟[J].安全与环境学报,2017,17(3):931-936.
[11]Wu K,Cheng G,Zhou D.Experimental research on dynamic movement in strata overlying coal mines using similar material modeling[J].Arabian Journal of Geosciences,2015,8(9):6521-6534.
[12]李生舟.采动覆岩裂隙场演化及瓦斯运移规律研究[D].重庆:重庆大学,2012.