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基于扫描电镜图像和微观渗流模型的云冈石窟砂岩风化特征分析

汪军 徐金明 龚明权 王亚磊

汪军, 徐金明, 龚明权, 王亚磊. 基于扫描电镜图像和微观渗流模型的云冈石窟砂岩风化特征分析[J]. 水文地质工程地质, 2021, 48(6): 122-130. doi: 10.16030/j.cnki.issn.1000-3665.202101022
引用本文: 汪军, 徐金明, 龚明权, 王亚磊. 基于扫描电镜图像和微观渗流模型的云冈石窟砂岩风化特征分析[J]. 水文地质工程地质, 2021, 48(6): 122-130. doi: 10.16030/j.cnki.issn.1000-3665.202101022
WANG Jun, XU Jinming, GONG Mingquan, WNAG Yalei. Investigating weathering features of sandstones in the Yungang Grottoes based on SEM images and micro-scale flow model[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 122-130. doi: 10.16030/j.cnki.issn.1000-3665.202101022
Citation: WANG Jun, XU Jinming, GONG Mingquan, WNAG Yalei. Investigating weathering features of sandstones in the Yungang Grottoes based on SEM images and micro-scale flow model[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 122-130. doi: 10.16030/j.cnki.issn.1000-3665.202101022

基于扫描电镜图像和微观渗流模型的云冈石窟砂岩风化特征分析

doi: 10.16030/j.cnki.issn.1000-3665.202101022
基金项目: 国家重点研发计划项目(2019YFC1520500);山西省重点研发计划项目(201803D31080)
详细信息
    作者简介:

    汪军(1995-),男,硕士研究生,主要从事岩土工程计算技术的研究工作。E-mail:wangjun50707@163.com

    通讯作者:

    徐金明(1963-),男,博士,教授,博士生导师,从事工程地质与岩土工程的教学与科研工作。E-mail:xjming@163.com

  • 中图分类号: P642.24

Investigating weathering features of sandstones in the Yungang Grottoes based on SEM images and micro-scale flow model

  • 摘要: 风化作用、岩石微观结构、岩石微观渗流特性定量关系的研究是石窟文物有效保护的重要基础,砂岩风化作用严重影响了岩体上石窟文物的有效保护。本次研究使用扫描电镜(SEM)获得云冈石窟不同窟体砂岩的微观图像,根据图像增强和图像分割技术得到了岩石中颗粒和孔隙的数字特征参数,从微观角度建立了反映孔喉连接特性的渗流模型,得到了不同窟体岩石的局部水力传导系数,分析了数字特征参数、水力传导系数、风化作用之间的关系。结果表明,风化作用对石窟砂岩微观结构具有很大影响;砂岩孔隙平均长轴长度大小对应的风化程度分别是全风化或强风化、中等风化、微风化或未风化,长度分别为大于40 μm、25~35 μm、15~25 μm;风化程度越高、水力传导系数越大,随着风化程度的增高、水力传导系数的范围为1 × 10−9~1 × 10−4 cm/s;水力传导系数与孔喉尺寸、孔喉连通性密切相关;孔喉半径比增大时、水力传导系数也增大。
  • 图  1  不同窟的砂岩风化等级[9]

    Figure  1.  Weathering levels of sandstone in various grottoes[9]

    图  2  不同窟砂岩样本的SEM图像

    Figure  2.  SEM images of sandstone samples in various grottoes

    图  3  图2(d)得到的灰度直方图

    Figure  3.  Grayscale histogram from SEM image in Fig. 2(d)

    图  4  不同窟砂岩样品的孔隙分布

    Figure  4.  Pore distributions of sandstone samples in various grottoes

    图  5  不同窟砂岩SEM图像的孔隙总数及平均面积

    Figure  5.  Pores numbers and average areas of SEM images for sandstone samples in various grottoes

    图  6  不同窟砂岩SEM图像的孔隙尺寸

    Figure  6.  Pore sizes of SEM images for sandstone samples in various grottoes

    图  7  基于孔喉通道的微观渗流模型

    Figure  7.  Microscale flow model based on pore-throat connections

    图  8  不同窟体砂岩的孔喉半径比

    Figure  8.  Pore-throat radius ratio of sandstone samples in various grottoes

    图  9  不同窟体砂岩的水力传导系数

    Figure  9.  Hydraulic conductivities of sandstone samples in various grottoes

    表  1  不同窟砂岩样品SEM图像的数字特征参数

    Table  1.   Digital parameters of SEM images for sandstone samples in various grottoes

    石窟编号颗粒数量/个颗粒平均粒径/μm颗粒平均圆度面孔隙率/%
    130510.650.4236.85
    341914.740.4830.13
    42148.470.4314.32
    71894.980.4017.32
    82869.480.4531.38
    10794.430.2618.38
    1533116.940.5233.22
    171282.470.2919.89
    19724.910.3412.20
    下载: 导出CSV

    表  2  不同窟体砂岩SEM图像的孔隙特征参数

    Table  2.   Pore digital parameters of SEM images for sandstones in various grottoes

    石窟
    编号
    ri/(10−6 m)ro/(10−6 m)d/(10−6 m)η/(10−6 m2·s−1
    161.906.33101.421.42
    349.025.2784.811.38
    433.114.2151.981.38
    727.723.6239.321.30
    841.173.9369.581.38
    1018.013.8631.801.30
    1558.734.33125.271.42
    1721.033.6440.831.34
    1921.693.9851.941.34
    下载: 导出CSV

    表  3  不同窟体砂岩的风化特征参数

    Table  3.   Weathering characteristic parameters for sandstones in various grottoes

    石窟编号孔喉半径比水力传导系数/(cm·s−1
    19.781.14 × 10−5
    39.307.71 × 10−5
    48.808.86 × 10−7
    77.669.23 × 10−8
    810.484.23 × 10−6
    104.012.09 × 10−9
    1513.568.64 × 10−5
    175.022.14 × 10−8
    195.443.31 × 10−8
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-01-12
  • 修回日期:  2021-03-11
  • 网络出版日期:  2021-11-15
  • 刊出日期:  2021-11-15

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