采动影响下煤层瓦斯运移规律研究
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摘要
煤层中的瓦斯流动是一个瓦斯气体运移与煤层固体变形之间相互耦合的复杂过程。以鹤煤三矿3号煤层4101工作面为研究对象,建立了双重孔隙特性瓦斯运移数学模型,借助有限元方法量化分析了气体运移、钻孔破坏之间的气固耦合现象,分析了塑性破坏对渗透率的影响,并利用Comosol研究了注入空气对瓦斯压力、流量的作用过程。现场试验表明,数值模拟所得结果较好地匹配了现场瓦斯压力结果,数据间的差异可能来自于对煤层赋存环境的理想简化,所建立抽采模型可以用于矿井抽采钻孔参数设计与抽采效果评价。
The gas flow in the coal seam is a complex process of coupling gas gas migration and coal bed solid deformation.In this paper,the 4101 working face of No.3 coal seam in No.3 Coal Mine of Hebi Coal Mine was taken as the research object,a mathematical model of double-porosity characteristic gas migration was established,and the gas-solid coupling between gas migration and borehole destruction was quantitatively analyzed by the finite element method.The influence of plastic failure on permeability was analyzed.Based on this,Comosol was used to study the action of injected air on gas pressure and flow.Field experiments showed that the results obtained by the numerical model matched well with the results of gas pressure at the site.The difference may come from the ideal simplification of the coal deposit environment.The established drainage model can be used for mine drainage drilling parameter design and drainage effect evaluation.
The gas flow in the coal seam is a complex process of coupling gas gas migration and coal bed solid deformation.In this paper,the 4101 working face of No.3 coal seam in No.3 Coal Mine of Hebi Coal Mine was taken as the research object,a mathematical model of double-porosity characteristic gas migration was established,and the gas-solid coupling between gas migration and borehole destruction was quantitatively analyzed by the finite element method.The influence of plastic failure on permeability was analyzed.Based on this,Comosol was used to study the action of injected air on gas pressure and flow.Field experiments showed that the results obtained by the numerical model matched well with the results of gas pressure at the site.The difference may come from the ideal simplification of the coal deposit environment.The established drainage model can be used for mine drainage drilling parameter design and drainage effect evaluation.
引文
[1] 梁冰,袁欣鹏,孙维吉.本煤层顺层瓦斯抽采渗流耦合模型及应用[J].中国矿业大学学报,2014(2):208-213.Liang Bing,Yuan Xinpeng,Sun Weiji.Coupling model and application of gas drainage and seepage along coal seam[J].Journal of China University of Mining and Technology,2014(2):208-213.
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[7] 卢平,袁亮,程桦,等.低透气性煤层群高瓦斯采煤工作面强化抽采卸压瓦斯机理及试验[J].煤炭学报,2010,35(4):580-585.Lu Ping,Yuan Liang,Cheng Hua,et al.Enhanced extraction and pressure relief mechanism and test of high gas mining face in low permeability coal seam group[J].Journal of China Coal Society,2010,35(4):580-585.
[8] 刘清泉.多重应力路径下双重孔隙煤体损伤扩容及渗透性演化机制与应用[D].徐州:中国矿业大学,2015.
[9] 范超军,李胜,罗明坤,等.基于流—固—热耦合的深部煤层气抽采数值模拟[J].煤炭学报,2016,41(12):3076-3085.Fan Chaojun,Li Sheng,Luo Mingkun,et al.Numerical simulation of deep coalbed methane extraction based on fluid-solid-thermal coupling[J].Journal of China Coal Society,2016,41(12):3076-3085.
[2] 汪有刚,李宏艳,齐庆新,等.采动煤层渗透率演化与卸压瓦斯抽放技术[J].煤炭学报,2010,35(3):406-410.Wang Yougang,Li Hongyan,Qi Qingxin,et al.Permeability evolution and pressure relief gas drainage technology of mined-coal seam[J].Journal of China Coal Society,2010,35(3):406-410.
[3] 张鹏.采动影响下煤体内瓦斯运移规律实验与理论研究[D].北京:中国矿业大学(北京),2012.
[4] 袁亮,郭华,李平,等.大直径地面钻井采空区采动区瓦斯抽采理论与技术[J].煤炭学报,2013,38(1):1-8.Yuan Liang,Guo Hua,Li Ping,et al.Theory and technology of gas extraction in mined-out area of large diameter surface drilling[J].Journal of China Coal Society,2013,38(1):1-8.
[5] 周福宝,孙玉宁,李海鉴,等.煤层瓦斯抽采钻孔密封理论模型与工程技术研究[J].中国矿业大学学报,2016,45(3):433-439.Zhou Fubao,Sun Yuning,Li Haijian,et al.Research on theoretical model and engineering technology of gas extraction borehole seal in coal seam[J].Journal of China University of Mining and Technology,2016,45(3):433-439.
[6] 尹光志,何兵,李铭辉,等.采动过程中瓦斯抽采流量与煤层支承应力的相关性[J].煤炭学报,2015,40(4):736-741.Yin Guangzhi,He Bing,Li Minghui,et al.Correlation between gas extraction flow and bearing stress of coal seam in mining process[J].Journal of China Coal Society,2015,40(4):736-741.
[7] 卢平,袁亮,程桦,等.低透气性煤层群高瓦斯采煤工作面强化抽采卸压瓦斯机理及试验[J].煤炭学报,2010,35(4):580-585.Lu Ping,Yuan Liang,Cheng Hua,et al.Enhanced extraction and pressure relief mechanism and test of high gas mining face in low permeability coal seam group[J].Journal of China Coal Society,2010,35(4):580-585.
[8] 刘清泉.多重应力路径下双重孔隙煤体损伤扩容及渗透性演化机制与应用[D].徐州:中国矿业大学,2015.
[9] 范超军,李胜,罗明坤,等.基于流—固—热耦合的深部煤层气抽采数值模拟[J].煤炭学报,2016,41(12):3076-3085.Fan Chaojun,Li Sheng,Luo Mingkun,et al.Numerical simulation of deep coalbed methane extraction based on fluid-solid-thermal coupling[J].Journal of China Coal Society,2016,41(12):3076-3085.