基于分形理论的粉砂质泥岩酸雨崩解特征研究

赵晓彦 李昆鹏 肖典 曾彩云 张良

赵晓彦, 李昆鹏, 肖典, 等. 2020. 基于分形理论的粉砂质泥岩酸雨崩解特征研究[J]. 工程地质学报, 28(2): 232-239. doi: 10.13544/j.cnki.jeg.2019-368
引用本文: 赵晓彦, 李昆鹏, 肖典, 等. 2020. 基于分形理论的粉砂质泥岩酸雨崩解特征研究[J]. 工程地质学报, 28(2): 232-239. doi: 10.13544/j.cnki.jeg.2019-368
Zhao Xiaoyan, Li Kunpeng, Xiao Dian, et al. 2020. Slaking characteristics of silty mudstone under acid rain action based on fractal dimension[J]. Journal of Engineering Geology, 28(2): 232-239. doi: 10.13544/j.cnki.jeg.2019-368
Citation: Zhao Xiaoyan, Li Kunpeng, Xiao Dian, et al. 2020. Slaking characteristics of silty mudstone under acid rain action based on fractal dimension[J]. Journal of Engineering Geology, 28(2): 232-239. doi: 10.13544/j.cnki.jeg.2019-368

基于分形理论的粉砂质泥岩酸雨崩解特征研究

doi: 10.13544/j.cnki.jeg.2019-368
基金项目: 

四川省交通运输厅科技项目 2015B1-1

国家自然科学基金资金项目 41672295

详细信息
    作者简介:

    赵晓彦(1977-),男,博士,教授,博士生导师,主要从事地质灾害及防治工程方面研究.E-mail: xyzhao2@swjtu.edu.cn

    通讯作者:

    李昆鹏(1995-),男,硕士生,主要从事环境岩土及边坡加固方面研究.E-mail: kunpeng_lee@163.com

  • 中图分类号: P642.22

SLAKING CHARACTERISTICS OF SILTY MUDSTONE UNDER ACID RAIN ACTION BASED ON FRACTAL DIMENSION

Funds: 

Science and Technology Project of Department of Transportation of Sichuan Province 2015B1-1

the National Natural Science Foundation of China 41672295

  • 摘要: 黏土岩的崩解过程易受环境条件(如崩解液特征)影响,酸雨作用对其影响显著,但其酸雨崩解特征有待研究。目前对黏土岩崩解特征的评价多采用耐崩解性指数,仅考虑崩解后大于2mm的残留颗粒质量,未反映崩解后的整体粒径分布特征。本文以典型酸雨区攀枝花机场滑坡为依托,选取滑带粉砂质泥岩,开展不同pH值条件下的岩石崩解试验;引入分形理论,建立分形维数与酸雨历时、降雨酸度间的相关关系,定量刻画粉砂质泥岩酸雨崩解特征及影响因素;采用电感耦合等离子体发射光谱法分析不同酸度崩解溶液的离子成分差异,以探索降雨酸度造成岩石崩解特征差异的本质原因。结果表明:采用分形理论可以较好地反映粉砂质泥岩酸雨崩解特征,分形维数越大,粉砂质泥岩崩解程度越大;分形维数与酸雨历时、降雨酸度之间皆存在明显对数正相关关系;不同降雨酸度粉砂质泥岩崩解特征存在差异的原因在于白云石、方解石溶蚀程度不同。研究成果可为酸雨地区黏土岩的工程性质评价提供参考。
  • 图  1  取样点位置

    Figure  1.  Sample location

    图  2  试样矿物组成及含量(%)

    Figure  2.  Mineral composition and content of the sample

    图  3  粉砂质泥岩室内试验样品

    Figure  3.  Silty mudstone samples

    图  4  耐崩解仪

    Figure  4.  The slake durability testing device

    图  5  不同pH条件下试样崩解照片

    a. pH=7;b. pH=5;c. pH=3

    Figure  5.  Photos of samples after slaking at different pH values

    图  6  不同pH条件下各粒组含量随崩解循环次数的变化

    a. >=20mm;b. 10~20mm;c. 5~10mm;d. 2~5mm

    Figure  6.  Curves of percentage content of different particle size groups with slaking cycles at different pH values

    图  7  不同pH酸雨作用下粉砂质泥岩崩解残留物的曲线

    a. pH=7;b. pH=5;c. pH=3

    Figure  7.  Curves of slaking residues of silty mudstone under acid rain action of different pH value

    图  8  粉砂质泥岩分形维数随崩解循环次数变化曲线

    Figure  8.  Curves of fractal dimension of silty mudstone varying with the number of slaking cycles

    图  9  降雨酸度与粉砂质泥岩分形维数关系曲线

    Figure  9.  Curves between acidity of rainfall and fractal dimension of silty mudstone

    图  10  不同降雨酸度下崩解完成后水溶液阳离子种类及含量

    Figure  10.  The composition and content of cations in aqueous solution after slaking cycles under the acid rain action with different acidities

    表  1  试样在不同pH酸雨作用下的耐崩解性指数

    Table  1.   The slake durability index of samples under different pH value

    pH值条件 耐崩解性指数/%
    pH=7 97.19
    pH=5 95.71
    pH=3 95.12
    下载: 导出CSV

    表  2  试样在不同pH酸雨作用下的分形维数

    Table  2.   Fractal dimension of samples under acid rain action of different pH value

    pH值
    条件
    分形维数DS
    1 2 3 4 5 6 7 8 9
    pH=7 0.39 0.53 0.68 0.69 0.76 0.83 0.82 0.84 0.85
    pH=5 0.48 0.71 0.93 0.94 1.00 0.98 0.92 0.99 0.99
    pH=3 0.54 0.85 1.01 1.06 1.10 1.05 1.06 1.10 1.10
    下载: 导出CSV

    表  3  酸雨作用下粉砂质泥岩分形维数与崩解循环次数拟合方程

    Table  3.   Correlation fitting equations of fractal dimension of silty mudstone and cycle number under acid rain action

    pH值条件 拟合方程 相关系数R
    pH=7 DS=0.2179 lnn+0.4000 0.9875
    pH=5 DS=0.2205 lnn+0.5686 0.9058
    pH=3 DS=0.2344 lnn+0.6522 0.9143
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-09-03
  • 修回日期:  2019-12-28
  • 刊出日期:  2020-04-25

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