煤吸附/解吸瓦斯变形特征及孔隙性影响实验研究  

Experimental study on coal strain induced by methane sorption/desorption and effect of pore features

作　　者：祝捷[1] 张敏[1] 传李京 唐俊[1] 赵菲[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,北京100083

出　　处：《岩石力学与工程学报》2016年第A01期2620-2626,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：高等学校博士学科点专项科研基金(20120023120011);北京市高等学校青年英才计划项目(YETP0943);中央高校基本科研业务费项目(2010QL02)~~

摘　　要：煤吸附/解吸瓦斯的力学响应特征是煤与瓦斯突出机制研究中的重要问题。利用煤体吸附/解吸变形试验系统,对取自开滦矿区赵各庄矿9号煤层的原煤样品进行不同吸附压力下的吸附/解吸变形观测,配合高压压汞实验和液氮吸附实验研究煤样吸附解吸变形存在差异的原因。实验结果显示:煤吸附/解吸瓦斯产生的膨胀/收缩变形呈各向异性,卸压初期煤样收缩变形较快,之后变形速率减缓,变形需要很长时间才能稳定;吸附压力越大,瓦斯解吸时煤样的收缩变形越显著;煤的微孔含量和孔隙连续性是影响其吸附解吸变形量、解吸变形速率和残余变形量的主要因素。The mechanical behavior of coal adsorbing/desorbing methane is an important issue in the mechanism of coal and gas outburst. The sorption/desorption deformations of coal samples, from No. 9 coal seam in Zhaogezhuang Mine of Kailuan Mines, under different gas pressures of sorption were observed by means of the test system for sorption-induced strain. Using mercury intrusion porosimetry（MIP） and nitrogen adsorption（NA） methods, the reasons for strain differentia of coal samples were analyzed. The experimental results show that methane sorption/desorption results in anisotropic swelling/shrinkage, and it takes a long time for coal strain to stabilize. Coal shrinkage increases quickly at the start of desorption period, and then it increases slowly. Gas pressure of sorption is greater, the more significant shrinkage of coal deformation due to gas desorption. Micropore amount and pore continuity in the coal samples are the important factors that control coal sorption/desorption deformation, the strain rate and residual strain of coal shrinkage.

关 键 词：采矿工程 瓦斯吸附 煤与瓦斯突出 解吸变形 压汞法 液氮吸附法 孔隙结构 

分 类 号：TD84[矿业工程—煤矿开采]