卸围压条件下含瓦斯煤渗透性演化试验研究  

Experimental study on evolution of permeability of coal containing methane under confining pressure unloading condition

作　　者：李晓艳[1,2] 孙光中 付江伟[2] LI Xiaoyan SUN Guangzhong FU Jiangwei(School of Resources and safety Engineering, Central South University, Changsha Hunan 410083, China School of Safety Energy ＆ Environment Engineering, Zhongyuan University of Technology, Zhengzhou Henan 451191, China School of Safety Engineering, Henan Institute Engineering,Zhengzhou Henan 451191, China Key Laboratory of Coal Mine Safety Training Base in Henan Province, Henan Institute Engineering, Zhengzhou Henan 451191, China)

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]中原工学院能源与环境学院,河南郑州451191 [3]河南工程学院安全工程学院,河南郑州451191 [4]河南省煤矿安全重点实验室培养基地,河南郑州451191

出　　处：《中国安全科学学报》2017年第8期114-119,共6页China Safety Science Journal

基　　金：国家自然科学基金资助(51174082;51604091;51604311);河南省重点科技攻关项目(132102210485);河南省高等学校重点科研项目(17A440002)

摘　　要：为探究蠕变过程煤体应力卸载瓦斯可抽采程度,用河南工程学院自行研制的含瓦斯煤热-流-固耦合三轴渗流试验装置对润东煤业3号煤层含瓦斯煤原煤样进行渗流测试,并进行渗透率模型的理论分析,对比试验数据与模型计算数据。结果表明:试验过程中轴压降起始于卸围压后,渗透率变化滞后于轴压降;渗透率在卸围压初期变化不大,随应变的增加,渗透率由慢慢减小到突然增加。卸围压过程中的渗透率与轴向应变变化具有一致性,且与时间符合指数函数关系。Seepage tests were done for containing gas coal samples from Rundong no.3 coal seam to explore the extraction degree of coal seam gas in the short-time creep process.A theoretical analysis was made for the permeability after building a permeability model.The test data and the model calculation data were analyzed.The results show that the axial pressure drop is after unloading confining pressure and is followed by permeability change,that in the early stages of unloading,permeability changes slightly and reduces slowly with the increase of the strain,then increases suddenly,that there is good consistency between the axial strain and the permeability after unloading,and that both the permeability and the strain are a exponential function of time.

关 键 词：渗透率 蠕变 卸围压 渗透率动态模型 含瓦斯煤 

分 类 号：X936[环境科学与工程—安全科学]