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On-line Access: 2023-07-20
Received: 2022-11-09
Revision Accepted: 2023-02-21
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Tuo LU, Yaming TANG, Yongbo TIE, Bo HONG, Wei FENG. Fractal analysis of small-micro pores and estimation of permeability of loess using mercury intrusion porosimetry[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2200528 @article{title="Fractal analysis of small-micro pores and estimation of permeability of loess using mercury intrusion porosimetry", %0 Journal Article TY - JOUR
基于压汞试验的黄土小微孔分维分析及渗透评价机构:1中国地质科学院,中国北京,100037;2中国地质大学(北京),水资源与环境学院,中国北京,100083;3中国地质调查局西安地质调查中心,中国西安,710054;4中国地质调查局成都地质调查中心,中国成都,610081 目的:基于压汞法(MIP)的6种分形模型常被用来研究多孔介质的分形特征,但是这些模型中的大多数并不能直接适用于黄土的小微孔,且小微孔隙对水的渗流吼道有显著影响。本文旨在结合常规变水头渗透试验、MIP分析和扫描电镜(SEM)图像等,研究小微孔及其饱和渗透特性,并验证6种MIP分形模型是否可用于评估原状黄土的微结构类型和饱和渗透特征。 创新点:1.结合饱和渗透系数和SEM图像计盒维数等参数进行相关性分析和显著性检验,以确定最适合黄土小微孔的MIP分形模型;2.建立SEM分形维数和MIP分形维数的耦合,并结合黏粒含量,对原状黄土微结构类型进行分类和对饱和渗透系数从1×10?4cm/s变到1×10?5cm/s进行评价。 方法:1.通过压汞试验和6种MIP分形模型公式,得出原状黄土小微孔隙在不同分形模型下的分形维数。2.通过SEM图像和计盒维数计算得出原状黄土小微孔隙的二维分形维数。 结论:1.模型2(Neimark模型)对小微孔隙显示出非常好的线性拟合(拟合系数大于0.94);其分形维数值与黏土含量、密度和饱和渗透系数呈强正相关,并与SEM图像的计盒维数相匹配。2.黏土颗粒含量高会导致小微孔数量增加;这些小微孔会导致孔隙结构的表面粗糙度和不均匀性增加,从而呈现出较大的分形维数;这一过程最终导致大中孔隙和主导流线减少,从而降低饱和渗透性。3.本研究提出了新的分维椭圆及其面积比(*EAR)参数,其中两个主要的半轴由Neimark模型的结果(减2)和计盒维数(减1)组成;*EAR和黏土含量可作为定量评价黄土微结构类型和饱和渗透性的有效参数;当*EAR在35%至50%之间、黏土含量在9%至15%之间时,原状黄土微观结构从Ⅰ型转变为Ⅱ型;当*EAR大于50%、黏土含量大于15%时,微结构进一步从Ⅱ型转变为Ⅲ型;相应地,饱和渗透系数从1×10?4cm/s转变为1×10?5cm/s。 关键词组: Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article
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