岩土力学 ›› 2019, Vol. 40 ›› Issue (7): 2617-2627.doi: 10.16285/j.rsm.2018.0610

• 基础理论与实验研究 • 上一篇    下一篇

各向异性片岩的微观组构信息定量 提取与断面形貌特征分析

尹晓萌1，晏鄂川2，王鲁男3，陈 利1   

  1. 1. 信阳师范学院 建筑与土木工程学院，河南 信阳 464000；2. 中国地质大学（武汉）工程学院，湖北 武汉 430079； 3. 辽宁石油化工大学 矿业工程学院，辽宁 抚顺 113001
  • 收稿日期:2018-04-13 出版日期:2019-07-11 发布日期:2019-07-19
  • 作者简介:尹晓萌，男，1988年生，博士，讲师，主要从事工程岩土体稳定性研究。
  • 基金资助:
    国家自然科学基金项目(No. 41672313，No. 41807240)；河南省科技攻关项目(No. 182102310786)；信阳师范学院“南湖青年学者”奖励计划。

Quantitative microstructure information extraction and microscopic morphology analysis of anisotropic schist

YIN Xiao-meng1, YAN E-chuan2, WANG Lu-nan3, CHEN Li1   

  1. 1. Faculty of Architecture and Civil Engineering, Xinyang Normal University, Xinyang, Henan 464000, China; 2. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China; 3. Faculty of Mining Engineering, Liaoning Shihua University, Fushun, Liaoning 113001, China
  • Received:2018-04-13 Online:2019-07-11 Published:2019-07-19
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41672313, 41807240), the Programs for Science and Technology Development in Henan (182102310786) and Nanhu Scholars Program for Young Scholars of Xinyang Normal University.

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摘要： 取3类具有明显片理面的武当群片岩，采用偏光显微镜、扫描电镜研究其微观组构、断面形貌特征。构建了面积百分比、尺寸与周长-面积分形维数、定向分布系数等指标，利用IPP专业图像处理软件，对矿物和孔隙（微裂隙）两系统的含量、形态、分布特征等进行定量分析；并基于Matlab的数字图像处理技术，对断裂面粗糙度展开定量评价。偏光显微镜下显示，片岩具有矿物定向排列与粒、片状矿物近互层状分布的典型特征。矿物系统的微观定量分析结果表明：武当群片岩白云母的含量为11%～30%；小岛法计算的白云母矿物周长-面积分形维数为1.31～1.39；定向分布系数为0.61～0.85；微裂隙依附于白云母矿物边缘孕育、扩展，导致武当群片岩的孔隙（微裂隙）微观指标与对应的矿物微观指标有较强的相关性。沿片理面的片岩断面主要呈现沿晶破坏特征，断口较平坦，基于断面形貌图绘制的灰度信号波曲线的盒维数为1.48～1.60；斜交片理面破裂的片岩断面以穿晶破坏为主，有穿晶-沿晶破坏交替而生的迹象，断口粗糙起伏，对应的灰度信号波曲线的盒维数为1.65～1.69。武当群片岩的断面粗糙度各向异性约为1.03～1.14。

关键词: 片岩, 微观组构, 断面形貌, 图像处理, 各向异性

Abstract: The microstructure and section characteristics of three kinds of Wudang group schist with obvious foliation were studied by polarizing microscope and scanning electron microscope. Multiple indicators including area percentage, size and perimeter area fractal dimension and directional distribution coefficient were proposed to quantitatively analyze the content, morphology and distribution characteristics of mineral system and pore (micro fissure) system by professional image processing software. The roughness of fracture surface was quantitatively evaluated based on the digital image processing technology of MATLAB. Polarizing microscope shows that the schist has typical characteristics of mineral orientated alignment and intergranular distribution of granular and lamellar minerals. The microscopic quantitative analysis of the mineral system shows that the content of the muscovite of Wudang group schist is 11%~30%. The perimeter-area fractal dimension of muscovite calculated by island method is 1.31~1.39. The directional distribution coefficient is 0.61 to 0.85. Since micro fissure is attached to the edge of muscovite, there is a strong correlation between microscopic indicators of micro fissure and those of mineral. The section of the schist along foliation mainly presents the characteristics of intergranular failure, so the fracture surface is relatively flat. The box dimension of the grayscale signal wave curve based on the profile map is 1.48~1.60. In contrast, the fractured schist section is mainly transgranular failure, with the signs of alternate transgranular and intergranular failure, which lead to rough fracture surface. The box dimension of the signal wave curve is 1.65 to 1.69. The roughness anisotropy of the fractured schist section is about 1.03 to 1.14.

Key words: schist, microstructure, section morphology, image processing, anisotropy

中图分类号: 

  • P 642
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