| 含瓦斯煤体固气耦合数学模型及数值模拟 |
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| 引用本文： | 郭平,曹树刚,张遵国,李毅,刘延保,李勇.含瓦斯煤体固气耦合数学模型及数值模拟[J].煤炭学报,2012,37(Z2):330-335. |
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| 作者姓名： | 郭平 曹树刚 张遵国 李毅 刘延保 李勇 |
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| 作者单位： | 1.重庆大学 煤矿灾害动力学与控制国家重点实验室，重庆 400044；;
2.重庆大学 复杂煤气层瓦斯抽采国家地方联合工程实验室，重庆 400044 |
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| 基金项目： | 国家自然科学基金资助项目(50074197);重庆市科委自然科学基金计划资助项目(CSTS2010BB118);中央高校基本科研业务费资助项目(CDJXS11241181) |
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| 摘 要： | 基于固气耦合作用的基本理论，从孔隙率和渗透率的基本定义出发，综合考虑吸附膨胀效应和Klinkenberg 效应对煤体中瓦斯的运移影响，推导出孔隙率与渗透率的动态参数模型，并建立了含瓦斯煤体固气耦合模型。运用有限元方法给出自然卸压条件下的耦合数值解。数值模拟结果表明：孔隙瓦斯压力随着自然卸压时间的增大而减小；煤体孔隙率和渗透率随自然卸压时间的增加而增加，与现场渗透率测试规律基本相符；从煤体深处向距离工作面煤壁方向，孔隙率与渗透率缓慢增加、急速下降、急剧增加等3个阶段。
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| 关 键 词： | 含瓦斯煤体 固气耦合 数值分析 瓦斯吸附 膨胀效应 Klinkenberg 效应 |
| 收稿时间： | 2011-12-19 |
Analysis of solid-gas coupling model and simulation of coal containing gas |
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| GUO Ping,CAO Shu-gang,ZHANG Zun-guo,LI Yi,LIU Yan-bao,LI Yong.Analysis of solid-gas coupling model and simulation of coal containing gas[J].Journal of China Coal Society,2012,37(Z2):330-335. |
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| Authors: | GUO Ping CAO Shu-gang ZHANG Zun-guo LI Yi LIU Yan-bao LI Yong |
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| Affiliation: | 1,2,4(1.State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;2.State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam,Chongqing University,Chongqing 400044,China;3.Chongqing Research Institute of China Coal Technology & Engineering Group Corporation,Chongqing 400037,China;4.DISTART Department,Faculty of Engineering,University of Bologna,Viale Risorgimento2,Bologna 40136,Italy) |
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| Abstract: | Based on basic solid and gas coupling theory，from the basic definition of the porosity and permeability，considering Klinkenberg effect and gas adsorption swelling effect on gas transportation in coal，the porosity model，the dynamic permeability model，and gas solid coupling model were established finally.The numerical simulation results in natural discharging conditions indicate that porosity gas pressure reduces with the decreases of duration of pressure natural discharging；permeability and porosity of coal enhances as pressure natural discharging duration increases，which is similar to permeability test rule in the spot.From the depths of the coal mining to working face，porosity and permeability increases slowly at beginning，then droops dramatically，at last increases sharply. |
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| Keywords: | coal containing gas solid gas coupling numerical analysis gas adsorption swelling effect Klinkenberg effect |
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