摘要
为了研究软煤体孔隙结构特征及其对煤体瓦斯赋存、流动特性的影响规律,基于分形理论,采用扫描电镜、低温氮吸附实验等方法,分析澄合矿区典型软煤体的微观孔裂隙结构及连通情况等,运用盒维数算法测算煤样微结构分形维数及分布情况。研究结果表明:澄合矿区软煤体孔隙、裂隙比较发育,孔洞与裂隙之间的连通性较好,软煤体孔隙形态复杂,较高的孔容值使软煤体具有较大的瓦斯吸附空间,一端几乎封闭的不透气性孔及细颈瓶状孔等孔型有利于瓦斯的吸附聚积,不利于瓦斯的扩散运移。研究结果可为深入研究软煤体微结构性质及软煤体中瓦斯运移规律提供理论依据。
In this paper, analysis was carried out on the fissure structure of micro pores and their conductivity in the soft coal based on the fractal theory, by using the scanning electron microscope and through low-temperature nitrogen adsorption experiments in order to study the pore structure characteristics in the soft coal and its influence law on the gas occurrence and migration features in Chenghe Coal Mining Area, and the fractal dimensions and distribution of the microstructure of coal samples were calculated by using of the boxing counting. The results showed that in Chenghe Coal Mining Area, the pores and fissures in the soft coal relatively developed, there was a better conductivity between pores and fissures, the pores' shape in the soft coal was complicated, the higher pore volume value made the soft coal have a larger gas adsorption space, the airtight pores with one end closed and the thin-neck bottle-shape pores were advantageous to gas adsorption and accumulation, but they were not advantageous to the gas diffusion and migration. The research results can provide theoretical basis for further studying the microstructural properties of the soft coal and the gas migration law in the soft coal.
出处
《矿业安全与环保》
北大核心
2015年第6期22-26,共5页
Mining Safety & Environmental Protection
关键词
软煤体
扫描电镜
低温氮吸附
孔隙结构
分形特征
soft coal
scanning electron microscope
low-temperature nitrogen adsorption
pore structure
fractal characteristics
