型煤试件在应力场中的瓦斯渗流特性分析  

Gas seepage characteristics of briquette samples in a stress field

作　　者：黄启翔[1] 尹光志[1] 姜永东[1] 易俊[1,2] 

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400030 [2]重庆科技学院安全工程学院,重庆400020

出　　处：《重庆大学学报（自然科学版）》2008年第12期1436-1440,共5页Journal of Chongqing University

基　　金：国家自然科学基金重点资助项目(50534080)

摘　　要：应用实验室自行研制的瓦斯渗流实验装置,通过保持轴向压力不变而改变围压和保持围压不变而改变轴向压力2种加载方式,对型煤试件的瓦斯渗透特性进行了实验研究。通过对实验结果的分析,认为试件的渗透率与其所受的应力状态有密切的关系,随各种应力的增加渗透率降低,围压对试件渗透率的影响比轴向压力大,试件渗透率与各种应力成负指数关系。根据达西定律,结合实验研究结果,推导出煤层瓦斯渗流方程,该方程能够模拟采场周围煤层瓦斯的渗流,对于利用采动应力场提高瓦斯的抽放效率具有现实指导意义。A new apparatus was constructed to investigate the impact of various loading conditions on the permeability of coal specimens. Test results show that loading condition has a definite influence on the permeability of coal specimens. Higher pressures lead to lower permeability, and it seems that the confining pressure has a greater effect than the axial stress does, while the permeability is related exponentially to applied stresses. Based on the experimental results, an equation governing gas seeping through coal seams is deduced within the frame of Darcy＇s Law, which may be helpful to understand the permeability properties of stressed coal seams and to improve the drainage of gassy coal beds.

关 键 词：应力场 瓦斯 渗流 

分 类 号：TD712[矿业工程—矿井通风与安全]