煤矸石充填体在不同参数条件下的瓦斯透气性实验研究
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摘要
为研究煤矸石充填体的瓦斯透气性,根据压差法和达西定律构建了一种煤矸石充填体瓦斯透气性实验系统,并利用该系统完成了煤矸石不同级配、不同围岩压力和不同瓦斯体积分数下的透气性实验。实验结果表明:实验测定的煤矸石充填体瓦斯透气系数在区间[0.649,3.206]m2/(MPa2·d)内,属于可以抽放范围,透气性较好。在实验基础上提出了通过适当增加煤矸石充填体的粒径和工作面风量、降低煤矸石充填体承载力和充填区域瓦斯含量的方法来增大煤矸石充填体的瓦斯透气系数,从而为安全高效的保护层开采煤矸石充填应用技术提供理论指导。
In order to study the gas permeability of coal gangue backfilling body, based on the pressure-difference method and Darcy's law, an experimental system for measuring the gas permeability has been proposed. And a series of experiments under various particle gradation,different surrounding rock pressures and different gas concentration have been conducted by using the system. The results have shown that the gas permeability coefficients of coal gangue backfilling body measured by the experiment are in the interval of [0.649,3.206] m2/(MPa2·d),which belong to the appropriate scope of gas drainage,and that the coal gangue backfilling body has good air penetrability. Based on the results of the experiments, the paper has put forward various methods such as appropriate increase of the grain size of coal gangue backfilling body and the ventilation quantity between working face ends, and decrease of the bearing capacity of coal gangue backfilling body and the gas concentration of packing area to increase the gas permeability of coal gangue backfilling body, and the experimental results have provided theoretical guidance for safe and highly effective gangue backfilling technology development under the circumstance of protective layer mining.
In order to study the gas permeability of coal gangue backfilling body, based on the pressure-difference method and Darcy's law, an experimental system for measuring the gas permeability has been proposed. And a series of experiments under various particle gradation,different surrounding rock pressures and different gas concentration have been conducted by using the system. The results have shown that the gas permeability coefficients of coal gangue backfilling body measured by the experiment are in the interval of [0.649,3.206] m2/(MPa2·d),which belong to the appropriate scope of gas drainage,and that the coal gangue backfilling body has good air penetrability. Based on the results of the experiments, the paper has put forward various methods such as appropriate increase of the grain size of coal gangue backfilling body and the ventilation quantity between working face ends, and decrease of the bearing capacity of coal gangue backfilling body and the gas concentration of packing area to increase the gas permeability of coal gangue backfilling body, and the experimental results have provided theoretical guidance for safe and highly effective gangue backfilling technology development under the circumstance of protective layer mining.
引文
[1]吕闰生,彭苏萍,徐延勇.含瓦斯煤体渗透率与煤体结构关系的实验[J].重庆大学学报,2012,35(7):114-118.LU Runsheng,PENG Suping,XU Yanyong.Experiments on the relationship between permeability of gas-bearing coal and coal body structure[J].Journal of Chongqing University,2012,35(7):114-118.
[2]高建良,刘佳佳,张学博.采空区渗透率对瓦斯运移影响的模拟研究[J].中国安全科学学报,2010,20(9):9-14.GAO Jianliang,LIU Jiajia,ZHANG Xuebo.Simulation study on the influence of permeability on gas migration in gob[J].China Safety Science Journal,2010,20(9):9-14.
[3]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.The evolution of permeability and gas extraction technology in mining coal seam[J].Journal of China Coal Society,2010,35(3):406-410.
[4]姜福兴,孔令海,刘春刚.特厚煤层综放采场瓦斯运移规律[J].煤炭学报,2011,36(3):407-411.JIANG Fuxing,KONG Linghai,LIU Chungang.Gas emission laws of fully-mechanized sublevel caving mining in extra-thick coal seam[J].Journal of China Coal Society,2011,36(3):407-411.
[5]梁赛江,王同旭,王太茂.采空区瓦斯渗透影响的综放面瓦斯运移模拟研究[J].山东科技大学学报,2012,31(6):15-19.LIANG Saijiang,WANG Tongxu,WANG Taimao.Modeling and research about gas transport based on the influence of high gas in the neighboring coal seam[J].Journal of Shandong University of Science and Technology,2012,31(6):15-19.
[6]张铁岗.矿井瓦斯综合治理技术[M].北京:煤炭工业出版社,2001:43-59.
[7]刘孝锋.基于压差法的透气性测试装置关键技术研究[D].广州:广东工业大学,2012.
[8]闵宝乾,陈斌,耿新柱,等.压差法测试成品鞋透气性能的实验研究[J].检验检疫学刊,2010,20(3):33-36.MIN Baoqian,CHEN Bin,GENG Xinzhu,et al.Study on the test of air permeability of finished shoes with“Air Pressure Variable”method[J].Journal of Inspection and Quarantine,2010,20(3):33-36.
[9]周世宁.瓦斯在煤层中流动的机理[J].煤炭学报,1990,15(1):61-67.ZHOU Shining.The mechanics of methane flow in coal seam[J].Journal of China Coal Society,1990,15(1):61-67.
[10]周世宁.电子计算机在研究煤层瓦斯流动理论中的应用[J].煤炭学报,1984,19(2):29-35.ZHOU Shining.Application of computer in research of gas flow equation[J].Journal of China Coal Society,1984,19(2):29-35.
[11]周世宁,孔辑正.煤层瓦斯流动理论及其应用[J].煤炭学报,1965,2(1):24-37.ZHOU Shining,KONG Jizheng.Gas flow theory and its application in coal seams[J].Journal of China Coal Society,1965,2(1):24-37.
[12]王志亮,杨仁树.现场测定煤层透气性系数计算方法的优化研究[J].中国安全科学学报,2011,21(3):23-28.WANG Zhiliang,YANG Renshu.Optimization study on calculation method on coal seam gas permeability coefficient in locale measurement[J].China Safety Science Journal,2011,21(3):23-28.
[13]题正义,秦洪岩,李树兴.矸石充填的压实特性试验分析[J].水资源与水工程学报,2012,23(4):129-131.TI Zhengyi,QIN Hongyan,LI Shuxing.Experimental analysis of compaction characteristics filled by coal gangue[J].Journal of Water Resources&Water Engineering,2012,23(4):129-131.
[14]周世宁,林柏泉.煤层瓦斯赋存与流动理论[M].北京:煤炭工业出版社,1999:60-83.
[15]张东明,胡千庭,袁地镜.成型煤样瓦斯渗流的实验研究[J].煤炭学报,2011,36(2):288-292.ZHANG Dongming,HU Qianting,YUAN Dijing.An experiment research on gas seepage of standard coal briquette specimen[J].Journal of China Coal Society,2011,36(2):288-292.
[2]高建良,刘佳佳,张学博.采空区渗透率对瓦斯运移影响的模拟研究[J].中国安全科学学报,2010,20(9):9-14.GAO Jianliang,LIU Jiajia,ZHANG Xuebo.Simulation study on the influence of permeability on gas migration in gob[J].China Safety Science Journal,2010,20(9):9-14.
[3]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.The evolution of permeability and gas extraction technology in mining coal seam[J].Journal of China Coal Society,2010,35(3):406-410.
[4]姜福兴,孔令海,刘春刚.特厚煤层综放采场瓦斯运移规律[J].煤炭学报,2011,36(3):407-411.JIANG Fuxing,KONG Linghai,LIU Chungang.Gas emission laws of fully-mechanized sublevel caving mining in extra-thick coal seam[J].Journal of China Coal Society,2011,36(3):407-411.
[5]梁赛江,王同旭,王太茂.采空区瓦斯渗透影响的综放面瓦斯运移模拟研究[J].山东科技大学学报,2012,31(6):15-19.LIANG Saijiang,WANG Tongxu,WANG Taimao.Modeling and research about gas transport based on the influence of high gas in the neighboring coal seam[J].Journal of Shandong University of Science and Technology,2012,31(6):15-19.
[6]张铁岗.矿井瓦斯综合治理技术[M].北京:煤炭工业出版社,2001:43-59.
[7]刘孝锋.基于压差法的透气性测试装置关键技术研究[D].广州:广东工业大学,2012.
[8]闵宝乾,陈斌,耿新柱,等.压差法测试成品鞋透气性能的实验研究[J].检验检疫学刊,2010,20(3):33-36.MIN Baoqian,CHEN Bin,GENG Xinzhu,et al.Study on the test of air permeability of finished shoes with“Air Pressure Variable”method[J].Journal of Inspection and Quarantine,2010,20(3):33-36.
[9]周世宁.瓦斯在煤层中流动的机理[J].煤炭学报,1990,15(1):61-67.ZHOU Shining.The mechanics of methane flow in coal seam[J].Journal of China Coal Society,1990,15(1):61-67.
[10]周世宁.电子计算机在研究煤层瓦斯流动理论中的应用[J].煤炭学报,1984,19(2):29-35.ZHOU Shining.Application of computer in research of gas flow equation[J].Journal of China Coal Society,1984,19(2):29-35.
[11]周世宁,孔辑正.煤层瓦斯流动理论及其应用[J].煤炭学报,1965,2(1):24-37.ZHOU Shining,KONG Jizheng.Gas flow theory and its application in coal seams[J].Journal of China Coal Society,1965,2(1):24-37.
[12]王志亮,杨仁树.现场测定煤层透气性系数计算方法的优化研究[J].中国安全科学学报,2011,21(3):23-28.WANG Zhiliang,YANG Renshu.Optimization study on calculation method on coal seam gas permeability coefficient in locale measurement[J].China Safety Science Journal,2011,21(3):23-28.
[13]题正义,秦洪岩,李树兴.矸石充填的压实特性试验分析[J].水资源与水工程学报,2012,23(4):129-131.TI Zhengyi,QIN Hongyan,LI Shuxing.Experimental analysis of compaction characteristics filled by coal gangue[J].Journal of Water Resources&Water Engineering,2012,23(4):129-131.
[14]周世宁,林柏泉.煤层瓦斯赋存与流动理论[M].北京:煤炭工业出版社,1999:60-83.
[15]张东明,胡千庭,袁地镜.成型煤样瓦斯渗流的实验研究[J].煤炭学报,2011,36(2):288-292.ZHANG Dongming,HU Qianting,YUAN Dijing.An experiment research on gas seepage of standard coal briquette specimen[J].Journal of China Coal Society,2011,36(2):288-292.