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Fractal analysis of small-micro pores and estimation of permeability of loess using mercury intrusion porosimetry

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第7期24卷 584-595页

作者： Tuo LU Yaming TANG Yongbo TIE Bo HONG Wei FENG Chinese Academy of Geological Sciences Beijing 100037China School of Water Resources and Environment China University of GeosciencesBeijing 100083China Xi'an Center of China Geological Survey Xi'an 710054China Chengdu Center of China Geological Survey Chengdu 610081China

Many popular models have been proposed to study the fractal properties of the pores of porous materials based on mercury intrusion porosimetry(MIP).However,most of these models do not directly apply to the small-micro pores of loess,which have a significant impact on the throat pores and tunnels for fluid ***,in this study we used a combination of techniques,including routine physical examination,MIP analysis,and scanning electron microscope(SEM)image analysis,to study these small-micro pores and their saturated water permeability *** techniques were used to determine whether the fractal dimensions of six MIP fractal models could be used to evaluate the microstructure types and permeability properties of *** results showed that the Neimark model is suitable for analysis of small-micro *** applied to saturated water permeability,the results from this model satisfied the correlation significance test and were consistent with those from SEM analysis.A high clay content and density cause an increase in the number of small-micro pores,leading to more roughness and heterogeneity of the pore structure,and an increase in the fractal *** process further leads to a decrease in the content of macro-meso pores and saturated water ***,we propose new parameters:the*Ellipse and its area ratios(*EAR).These parameters,coupled with 2D-SEM and 3D-MIP fractal dimensions,can effectively and quantitatively be used to evaluate the types of loess microstructures(from typeⅠto typeⅢ)and the saturated water permeability(magnitude from 1×10^(-4)cm/s to 1×10^(-5)cm/s).

关键词： Malan loess Fractal models Small-micro pores Mercury intrusion porosimetry(MIP) Microstructure saturated waterpermeability

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