不同瓦斯压力条件下含瓦斯煤的渗透特性试验研究  

The Experiment Study on Permeability of Coal Containing Methane under Different Methane Pressure

作　　者：袁梅[1,2,3] 李波波[2] 许江[1] 马科伟[2] 

机构地区：[1]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044 [2]贵州大学矿业学院,贵州贵阳550003 [3]贵州省非金属矿产资源综合利用重点实验室,贵州贵阳550003

出　　处：《煤矿安全》2011年第3期1-4,共4页Safety in Coal Mines

基　　金：贵州省科技厅社会发展攻关资助项目(黔科合SZ字〔2009〕3032);教育部春晖计划资助项目(Z2007-1-52012);重庆大学西南资源开发及环境灾害控制工程教育部重点实验室访问学者基金资助项目;贵州大学2010年研究生创新基金资助项目(校研理工2010038)

摘　　要：为探讨瓦斯压力对含瓦斯煤渗透特性的影响,通过含瓦斯煤的三轴剪切试验,获得试件在进行三轴渗流试验时始终处于稳定应力状态的轴向应力和围压的合理取值,在此基础上,以贵州松河煤矿8号煤为剖析对象,利用自主研制的出口压力可调的三轴渗透仪进行了有效应力和温度恒定、不同瓦斯压力条件下的三轴渗流试验。结果表明:当瓦斯压力恒定时,含瓦斯煤试件的抗剪强度随着围压的增加而增加;当有效应力、温度和试件两端压差恒定时,渗透率以指数关系随着间隙气压的增加而下降;当有效应力、温度和间隙气压恒定时,渗透率随着两端压差的增大而减少。试验结果为地面煤层气开发和井下瓦斯抽采提供了有力的技术支撑。To study the methane pressure influence on permeability of coal containing methane, through triaxial shearing test on coal containing methane, attaining the reasonable axial stress and confining pressure values when samples are always in steady stress state in the process of triaxial permeability experiments, based on those conditions, No. 8 coal seam coal of Songhe coal mine in Guizhou province were taken as analysis objects, and use triaxial permeability osmoscope to do triaxial permeability experiments on constant effective stress and temperature and different methane pressure conditions. As the results show, when the methane stress is constant, the shear- ing strength of coal samples containing methane will increase with the confining pressure increasing; when effective stress, temperature and differential pressure between samples both ends are constant, the permeability will decrease as exponential relationship with space barometric pressure decreasing; when effective stress, temperature and space barometric pressure are constant, the permeability will decrease with differential pressure between samples both ends increasing. The experiments results will provide effective technology support to exploit ground coal bed methane and extract methane under mines.

关 键 词：有效应力 瓦斯压力 含瓦斯煤 渗流率 

分 类 号：TD712[矿业工程—矿井通风与安全]