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为了有效地分析不同煤体结构煤中孔隙结构的变化特征,从实现精细化、无损化和定量化入手,应用μCT225kVFCB型高精度CT试验分析系统,分析了4类煤样(原生结构煤、碎裂煤、鳞片煤和糜棱煤)大孔级孔隙分布特征。通过显微CT切片,结合扫描电子显微镜图像,直观观测了不同煤体结构煤的孔隙类型和显微构造,分析了构造变形对煤孔隙结构的影响规律。结果表明:不同煤体结构煤孔隙直径一般小于5μm,但后期构造应力改变了煤的孔隙结构。与原生结构煤相比,碎裂煤阶段遭受脆性破裂,形成大量外生孔和微裂隙,面孔隙率和平均孔径最大;糜棱煤阶段发生塑性流变,糜棱质发育,充填孔隙,面孔隙率和平均孔径最小。
In order to analyze the variation characteristics of pore structure in coal with different coal structures effectively, the high-precision CT test and analysis system μCT225kVFCB was used to analyze the characteristics of four types of coal samples Fissured coal, flaky coal and mylonitized coal). Through the microscopic CT slice and the scanning electron microscope image, the pore types and microstructures of coal with different coal structures were visually observed, and the influence rules of the structural deformation on the pore structure of coal were analyzed. The results show that the pore diameter of coal in different coal structures is generally less than 5μm, but the post-stage structural stress changes the pore structure of coal. Comparing with the primary structural coal, the fragmented coal fractured brittle fracture, forming a large number of exogenous pores and micro-fractures, the largest surface porosity and average pore size; plastic rheology, mylonitization development, pore filling, surface Porosity and the smallest average pore size.