CAJ | 학술논문

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。
구조변형가이인기매납미급공극결구적변화，변형궤제적불동대공극결구적영향정도야불동。매적공극비균질성겁강，전통실험방법난이준학지묘술공극결구적복잡성，이분형이론제공료묘술저일복잡성적양화방법。기우위북매전한성광구불동류형구조매적저온담흡부실험，채용분형FHH방법，정량표정료구조변형대매납미급공극결구적영향정도。결과표명：인성변형매비취성변형매적공극분형유수고，공극결구복잡，비균질성증강，도치모세응취효응증강，흡부체후돌출；구조매분형유수수착평균공경적강저화중공함량적승고이증대，설명구조변형정도월대，평균공경월소，공극결구월복잡。연구인위，분형유수정량반영료매구조변형적강약，가이지시매중납미급공극결구적변형정도。
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. The results show that ductile deformed coals with higher pore fractal dimensions have higher heterogeneity and more complicated pore structure compared to brittle deformed coals, resulting in higher capillary condensation and prominent adsorption hysteresis. Fractal dimensions of tectonic coal increase with reduction of the average pore diameter and the increase of meso-pore content, indicating the stronger the tectonic deformation, the smaller the average pore size, the more complicated the pore structure. With the stress strengthening, fractal dimension shows an increasing trend. Thus, the fractal dimension can be used as an indicator of the deformation degree of the nano-pore structure.