钻孔抽采瓦斯量影响因素分析与工程实践  

Study on influence factors of drilling gas drainage and engineering practice

作　　者：李尧斌[1,2] 朱丹 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001 [2]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [3]江西省煤田地质勘查研究院,江西南昌330001

出　　处：《中国安全生产科学技术》2014年第11期124-128,共5页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(51004003;50974004);安徽省教育厅自然科学基金重点项目(KJ2010A091);淮南市指导性科技计划项目(2013A4001;2011B34);淮南矿业(集团)有限责任公司和安徽理工大学合作项目"瓦斯含量法预测突出危险期及检验效果技术装备研究"

摘　　要：为了提高钻孔抽采瓦斯量,基于煤层瓦斯流动和层次分析法等理论,研究了钻孔抽采瓦斯量的影响因素及各影响因素重要度,同时现场考察了透气性系数变化对钻孔瓦斯抽采量的影响。结果表明:钻孔抽采瓦斯量影响因素有煤层透气性系数、煤层原始瓦斯压力、煤层厚度、抽采钻孔孔径和抽采时间等,其中煤层透气性系数是对其起决定影响作用的参数;重要度上煤层透气性系数对钻孔瓦斯抽采量的影响是抽采负压和钻孔半径的7.1倍;被保护层的透气性系数增大可大幅度提高了钻孔抽采瓦斯量。In order to improve the gas drainage quantity of drilling,the influence factors on gas drainage quantity of drilling and the important degree of them were studied based on the theories of gas flow in coal seams and analytic hierarchy process.Meanwhile,the influence on gas drainage quantity by the change of permeability coefficient in coal seam was studied.The results showed that：the influence factors on gas drainage quantity of drilling include the permeability coefficient,the original gas pressure of coal seam,the thickness of coal seam,borehole diameter,and extraction time,etc.Among the influence factors,the coal seam permeability coefficient is the decisive influence parameters.About the important degree,the influence by the permeability coefficient of coal seam is 7.1times of the drainage negative pressure and the borehole radius,and the increase of permeability coefficient in protected coal seam can greatly increase the gas drainage quantity of drilling.

关 键 词：钻孔 抽采瓦斯量 瓦斯流动 

分 类 号：X936[环境科学与工程—安全科学]