贵州省突出煤层孔隙分形特征研究

发布时间：2018-12-29 17:47

【摘要】：以贵州省富煤区6个突出煤层为研究对象,采用液氮吸附实验和压汞实验,分析了各煤层煤样的孔隙大小分级,计算了煤样分形维数,并分析了各煤层煤样孔隙分形特征及其与瓦斯吸附量、煤样渗透性的关系。结果表明:6个煤层煤样不同级别的孔隙具有良好的分形特征,能够显示孔隙大小及孔隙分布特征,验证了采用分形维数可以定量分析煤样孔隙特征;微孔分形维数与煤样瓦斯吸附量呈正相关关系,不同煤田煤样瓦斯吸附能力差异较大;小孔分形维数反映了煤样孔隙结构较简单,煤样间孔隙结构复杂程度相似;中孔、大孔、显微裂隙和微裂隙分形维数显示煤样孔隙分布趋势基本一致,存在某些级别孔隙发育很差的情况,需要增透以提高抽采效果。
[Abstract]:Taking 6 outburst coal seams in coal rich area of Guizhou province as the research object, the pore size classification of coal samples in each coal seam was analyzed by liquid nitrogen adsorption experiment and mercury injection experiment, and the fractal dimension of coal sample was calculated. The fractal characteristics of pores in coal samples and their relationship with gas adsorption capacity and permeability of coal samples are analyzed. The results show that the pore size and pore distribution of 6 coal seam samples with different grades have good fractal characteristics, and it is proved that the fractal dimension can be used to quantitatively analyze the pore characteristics of coal samples. There is a positive correlation between the fractal dimension of micropore and the gas adsorption capacity of coal sample, the difference of gas adsorption capacity between coal samples is great, the fractal dimension of small pore indicates that the pore structure of coal sample is simple and the pore structure complexity of coal sample is similar. The fractal dimension of mesopore, macropore, microfissure and microfissure shows that the distribution trend of pores in coal samples is basically the same, and there are some poor development of pores in some grades, so it is necessary to increase the effect of extraction by antireflection.
【作者单位】：贵州大学矿业学院;贵州省非金属矿产资源综合利用重点实验室;贵州省优势矿产资源高效利用工程实验室;复杂地质矿山开采安全技术工程中心;
【基金】：国家自然科学基金资助项目(51574093) 贵州省高校工程技术研究中心建设项目(黔教合KY字[2013]112) 贵州大学引进人才科研基金资助项目(贵大人基合字[2015]30号);贵州大学矿业学院研究生创新基金资助项目(院研20160102)
【分类号】：TD713

【相似文献】