韩城矿区构造煤纳米级孔隙结构的分形特征-煤田地质与勘探.pdfVIP

第42 卷 第5 期 煤田地质与勘探 Vol. 42 No.5 2014 年 10 月 COAL GEOLOGY EXPLORATION Oct. 2014 文章编号: 1001-1986(2014)05-0004-05 韩城矿区构造煤纳米级孔隙结构的分形特征 张晓辉，要惠芳，李 伟，王秀娟，阎纪伟 (太原理工大学矿业工程学院，山西 太原 030024) : 构造变形可以引起煤纳米级孔隙结构的变化，变形机制的不同对孔隙结构的影响程度也不 同。煤的孔隙非均质性极强，传统实验方法难以准确地描述孔隙结构的复杂性，而分形理论提供 了描述这一复杂性的量化方法。基于渭北煤田韩城矿区不同类型构造煤的低温氮吸附实验，采用 分形FHH 方法，定量表征了构造变形对煤纳米级孔隙结构的影响程度。结果表明：韧性变形煤比 脆性变形煤的孔隙分形维数高，孔隙结构复杂，非均质性增强，导致毛细凝聚效应增强，吸附滞 后突出；构造煤分形维数随着平均孔径的降低和中孔含量的升高而增大，说明构造变形程度越大， 平均孔径越小，孔隙结构越复杂。研究认为，分形维数定量反映了煤构造变形的强弱，可以指示 煤中纳米级孔隙结构的变形程度。 ：韩城矿区；构造煤；孔隙结构；分形维数 ：P618.11 ：A DOI: 10.3969/j.issn.1001-1986.2014.05.002 Fractal characteristics of nano-pore structure in tectonically deformed coals in Hancheng mining area ZHANG Xiaohui, YAO Huifang, LI Wei, WANG Xiujuan, YAN Jiwei (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China) Abstract: The nano-pore structure can be changed under tectonic deformation, and the different deformation mechanisms influence also the pore structure in various degrees. Pore structure of coals is very inhomogeneous, and is exactly described difficultly by the conventional experimental methods, but the fractal theory provides a quantitative method for describing the complexity of the pore structure. The influence of tectonic deformation on nano-pore structure of different deformed coals collected from Hancheng mining area in Weibei coalfield was quantitatively analyzed by nitrogen gas adsorption experiment based upon the fractal Frenkel-Halsey-Hill (FHH) theory.