State Key Lab of Coal Resources and Safety Mining,China University of Mining and Technology (Beijing)school of Resources and Safety Engineering,China University of Mining and Technology (Beijing)

为了研究煤体的微观孔隙特征和吸附瓦斯煤体受载细观变形规律,采用低压液氮吸附、SEM研究了煤体孔隙的类型和孔径分布,研制了吸附瓦斯煤体加载CT扫描装置,利用工业CT扫描观测了吸附瓦斯煤体在加载过程中的细观变形过程。结果表明:煤表面的孔隙有圆柱形、狭缝形、楔形、墨水瓶形等,按照内部孔隙的连通类型分为贯通孔、内部连通孔、一端封闭孔和闭孔;不同应力条件下的CT图像显示,煤体内部呈非均质性,孔隙表现为非均匀分布特征,吸附瓦斯煤体在受载破坏裂隙也呈非均匀特性;吸附瓦斯煤体在受载条件下局部同时呈现膨胀效应和压缩效应,但在整体上表现是膨胀效应,这是由于煤体多孔性和非均质特性决定的。研究成果揭示了煤体微细观结构及变形特征,为研究含瓦斯煤体破坏机理及突出灾害动力过程提供了细观手段和研究基础。

in order to study the micro pore structure features of the coal mass and the meso deformation law of the adsored gas loaded coa a low pressure lieuidnitrogen adsorption and SEM were appied to study the pore type and pore sze distribution of thecoal mass Aloaded CT scaning device of the adsopion gas coal mas was researched and developed.The industrial CT scanning was appied to obsere the meso deformation processigof the adsopion gascoal mass n the loadingprocess.The resuis showed that the pore on the coalsurae would be a cyidica ,narrow gap wedge, inkotletype pore and others. According to the conection types of the inemal pore the pares could be dided ino a aol w- through hole intenal comected hole,one end closed hole and closed hole. Under the different stress conodiion.the CT images showed tht the coal intemnal vas in inhomogeneitythe pore representation was in heterogeneous distrbution features and the loaded falure porein the adsorbed gas coal mas also would be in heterogeneous features. Under the loaded condtion,th adsoption gas coal mass would have a sweig ffect and a shrinking effectlncally enerly the presenation would be the swelling effct and was caused due to the mutipore and inhongeneity.The studyresuts revealed themicro structure and deformation features of the coal mass .hich could provide the meso means and study base to stuty the fallre nechanism of the gassycal and outburst disaster dynamic process.

国家自然科学基金面上资助项目(51374216)；中央高校基本科研业务费专项资金资助项目(2009KZ03)；