不同黏粒含量粉土的微观结构研究

    黄春霞, 黄敏, 蔡伟, 陈国兴, 刘畅, 张艳美

    黄春霞, 黄敏, 蔡伟, 陈国兴, 刘畅, 张艳美. 不同黏粒含量粉土的微观结构研究[J]. 岩土工程学报, 2020, 42(4): 758-764. DOI: 10.11779/CJGE202004020
    引用本文: 黄春霞, 黄敏, 蔡伟, 陈国兴, 刘畅, 张艳美. 不同黏粒含量粉土的微观结构研究[J]. 岩土工程学报, 2020, 42(4): 758-764. DOI: 10.11779/CJGE202004020
    HUANG Chun-xia, HUANG Min, CAI Wei, CHEN Guo-xing, LIU Chang, ZHANG Yan-mei. Microstructure of silt with different clay contents[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(4): 758-764. DOI: 10.11779/CJGE202004020
    Citation: HUANG Chun-xia, HUANG Min, CAI Wei, CHEN Guo-xing, LIU Chang, ZHANG Yan-mei. Microstructure of silt with different clay contents[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(4): 758-764. DOI: 10.11779/CJGE202004020

    不同黏粒含量粉土的微观结构研究  English Version

    基金项目: 

    国家自然科学基金项目 51478221

    国家自然科学基金项目 51108235

    国家自然科学基金项目 51208510

    详细信息
      作者简介:

      黄春霞(1974—),女,博士,副教授,主要从事土动力学研究。E-mail: chunxiahuang@njtech.edu.cn

    • 中图分类号: TU441

    Microstructure of silt with different clay contents

    • 摘要: 粉土在中国广泛分布,粉土液化现象的发生与粉土微观结构息息相关。将粉土的宏观抗液化特性与微观结构特征结合起来,分析了不同黏粒含量粉土微观结构的变化规律。利用扫描电子显微镜(SEM)获取不同黏粒含量粉土的微观结构图像并运用Image-Pro Plus(IPP)图像处理软件对粉土微观参数进行计算和分析。结果表明,随着黏粒含量逐渐增加,粉土内部结构逐渐紧密,颗粒接触方式由直接线或面接触转变为点接触,孔隙类型由架空孔隙向镶嵌孔隙转变;孔隙面积随孔径增大而增大,微、小和中孔隙的数量随黏粒含量的增加先增大后减少;随着黏粒含量的增加,微、小和中孔隙形态基本保持不变,但大孔隙的丰度和分形维数显著增加,结构的复杂程度增加。通过不同黏粒含量微观结构的变化规律,揭示了黏粒含量对粉土微观结构的影响以及粉土宏观抗液化特性的微观机制。
      Abstract: The silt is widely distributed in China and the occurrence of liquefaction is closely related to its microstructure. The macroscopic liquefaction characteristics and microstructural characteristics of the silt are combined to analyze the change of the microstructure of the silt with different clay contents. The microstructural images under different clay contents are obtained by the scanning electron microscope (SEM), and the Plus Image-Pro (IPP) image processing software is used to calculate and analyze the micro parameters of the silt. The results show that the interior structure of the silt becomes close with the gradually increasing clay content. The contact of particles transforms from the direct line or surface transformation into the point contact, and for the pore space types the overhead pore becomes the mosaic one. The pore area increases with the increase of its radius, and the number of micro, small and medium pores increases at first and decreases with the increase of clay particle content. The morphology of the micro, small and medium pores is essentially the same, but the abundance and fractal dimension of macropores increase significantly, and the complexity of the structure increases. Through change of the microstructure of the silt with different clay contents, the influences of clay content on its microstructure and micro mechanism of the macro liquefaction characteristics are revealed.
    • 图  1   粉土X衍射图谱

      Figure  1.   X-ray diffraction spectra of silt

      图  2   原料土颗粒级配曲线

      Figure  2.   Grain-size distribution curves of original soils

      图  3   镀膜处理

      Figure  3.   Coating process

      图  4   二值化处理结果

      Figure  4.   Results of binary images

      图  5   不同黏粒含量粉土的SEM原图及二值图像

      Figure  5.   SEM and binary images of silt with different clay contents

      图  6   孔隙数量、面积分布直方图

      Figure  6.   Distribution histograms of pore number and area

      图  7   丰度随黏粒含量的变化曲线

      Figure  7.   Variation of abundance with clay content

      图  8   孔隙形态分维随黏粒含量的变化曲线

      Figure  8.   Variation of fractal dimension of pore morphology with clay content

      表  1   粉土中各种矿物含量

      Table  1   Contents of various minerals in silt

      矿物种类石英长石白云石白云母蒙脱石
      矿物含量/%63.58.46.717.34.1
      下载: 导出CSV

      表  2   原料土的粒径分布

      Table  2   Grain distribution of original soils

      土类细砂粒含量/%(0.25~0.075 mm)粉粒含量/%(0.075~0.005 mm)黏粒含量/%(<0.005 mm)
      细砂10000
      原料粉土42.054.64.4
      黏土076.323.7
      下载: 导出CSV

      表  3   原料土的塑性指数

      Table  3   Plastic indices of original soils

      土类液限wL/%塑限wP/%塑性指数IP
      原料粉土29.923.46.5
      黏土56.337.718.6
      下载: 导出CSV

      表  4   粉土试样的粒径分布

      Table  4   Grain-size distribution of test samples

      土样组别细砂粒含量/%(0.25~0.075 mm)粉粒含量/%(0.075~0.005 mm)黏粒含量/%(<0.005 mm)
      130682
      230646
      330628
      430619
      5306010
      6305812
      7305515
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2019-03-24
    • 网络出版日期:  2022-12-07
    • 刊出日期:  2020-03-31

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