突出煤和非突出煤全应力-应变瓦斯渗流试验研究  

An experimental study of gas permeabilities of outburst and nonoutburst coals under complete stress-strain process

作　　者：尹光志[1,2,3] 蒋长宝[1,2,3] 李晓泉[1,2,3] 王维忠[1,2,3] 蔡波[1,2,3] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030 [2]重庆大学资源及环境科学学院,重庆400030 [3]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400030

出　　处：《岩土力学》2011年第6期1613-1619,共7页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973计划)资助项目(No.2011CB201203);国家自然科学基金项目资助(No.50874124);中央高校基本科研业务费资助项目(No.CDJXS11240004);重庆大学"211工程"三期创新人才培养计划建设项目资助(No.S-10220)

摘　　要：以突出煤和非突出煤的型煤为研究对象,设计两种型煤全应力-应变瓦斯渗流试验方案,利用含瓦斯煤热-流-固耦合三轴伺服渗流试验系统,对比研究了两种型煤全应力-应变瓦斯渗流规律。结果表明,在应力-应变全过程中突出煤和非突出煤的煤样变形和瓦斯流量变化规律基本一致,即两种型煤在应力-应变全过程中瓦斯流量与煤样损伤变形的进程密切相关;瓦斯流量随着煤样的体积压缩而变小,且在煤样体积被压缩至最小时瓦斯流量降为最低值,煤样开始扩容后瓦斯流量转为增大;瓦斯流量随围压的增大而减小,且围压越大,瓦斯流量随应变变化的幅度越小。煤性对煤层瓦斯渗透性有明显影响,其渗透性可作为判断煤与瓦斯突出危险程度的一个重要指标。Focusing on outburst coal and nonoutburst coal,the permeability experiments on the outburst coal and nonoutburst coal briquettes during the complete stress-strain process were designed using ＂Coal Containing Gas THM Coupling System＂;to study their permeable properties in the complete stress-strain process.The results show that： during the complete stress-strain process,the deformation of outburst/nonoutburst coal showed similar trends with gas volume flow velocity,which means,in the complete stress-strain processes of both kinds of coals,gas volume flow velocity is tightly related with the damage deformation process of coal.The gas volume flow velocity decreased with the compressing of coal volume,decreased to the lowest value when the coal volume was compressed to the minimum;and then when coal volume began to expand,gas flow velocity turns to increase.The gas volume flow velocity decreased with the increasing of confining pressure;and the higher the confining pressure was,the smaller the changing rate of gas volume flow velocity to strain was.The properties of coal show an evident effect on gas permeation;so the permeability could be treated as a significant criterion for the judgement of coal-gas outburst criticality.

关 键 词：岩石力学 采矿工程 渗流 全应力-应变 型煤 瓦斯 

分 类 号：O357.3[理学—流体力学]