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基于光反射率突变的受力岩石裂纹提取方法

高祥 高亚楠

高祥,高亚楠. 基于光反射率突变的受力岩石裂纹提取方法[J]. 工矿自动化,2022,48(8):76-84.  doi: 10.13272/j.issn.1671-251x.2022040066
引用本文: 高祥,高亚楠. 基于光反射率突变的受力岩石裂纹提取方法[J]. 工矿自动化,2022,48(8):76-84.  doi: 10.13272/j.issn.1671-251x.2022040066
GAO Xiang, GAO Yanan. Method for extracting stressed rock crack based on light reflectivity mutation[J]. Journal of Mine Automation,2022,48(8):76-84.  doi: 10.13272/j.issn.1671-251x.2022040066
Citation: GAO Xiang, GAO Yanan. Method for extracting stressed rock crack based on light reflectivity mutation[J]. Journal of Mine Automation,2022,48(8):76-84.  doi: 10.13272/j.issn.1671-251x.2022040066

基于光反射率突变的受力岩石裂纹提取方法

doi: 10.13272/j.issn.1671-251x.2022040066
基金项目: 安徽理工大学引进人才基金资助项目(13210153) 。
详细信息
    作者简介:

    高祥(1990—),男,河南周口人,讲师,博士,主要从事矿山岩石力学研究工作,E-mail:gaoxiang1606@163.com

    通讯作者:

    高亚楠(2002—),男,安徽蚌埠人,本科在读,研究方向为智能采矿工程,E-mail:3351613411@qq.com

  • 中图分类号: TD315

Method for extracting stressed rock crack based on light reflectivity mutation

  • 摘要: 裂纹识别与提取是认识围岩裂纹演变规律的基础。针对目前基于可见光照片的受力岩石裂纹提取方法对由多色矿物组成的复杂岩石(如花岗岩)裂纹提取效果较差的问题,提出一种基于光反射率突变的受力岩石裂纹提取方法。该方法包括光反射率计算、光反射率突变点识别、光反射率突变点空间分异性分析、裂纹信息提取4个关键步骤。裂纹发育引起的光反射率突变点在空间上的分异性是识别裂纹的关键特征,因此,引入反映空间点分布集中程度的指标−分异系数C,根据光反射率突变点的空间分异性判断数字图像中是否存在裂纹。判断出数字照片中存在裂纹后,一方面,通过光反射率变化速率反映裂纹活动的瞬时信息,以研究试件在何时、何处有裂纹产生或扩展;另一方面,提取出裂纹活动的累积信息,以分析一段时间内岩石表面裂纹的发育、扩展情况及贯通程度。实验结果表明:① 受力岩石裂纹发育、扩展可引起光反射率突变,突变速率可达0.2/s,远大于由其他随机因素导致的变化速率(0.03/s)。② 在裂纹活动时刻,光反射率突变点呈显著的空间分异现象(C值可达189),分异系数远大于随机分布时的值(C值为1)。③ 所提方法能够提取出裂纹活动的瞬时信息和累积信息。最后讨论了岩石破裂过程中光反射率变化的原因、所提方法的岩石力学意义及其在巷道安全巡检中的应用前景。

     

  • 图  1  受力岩石裂纹提取流程

    Figure  1.  Crack extraction process of stressed rock

    图  2  受力岩石裂纹提取实验系统

    Figure  2.  Experimental system of crack extraction of stressed rock

    图  3  标准板灰度分析结果

    Figure  3.  Grayscale analysis results of standard plates

    图  4  AR0区域裂纹活动前后照片

    Figure  4.  Photographs of AR0 region before and after crack activity

    图  5  AR0区域裂纹活动前后光反射率变化速率空间分布

    Figure  5.  Spatial distribution of change speed of light reflectivity before and after crack activity in AR0 region

    图  6  AR0 区域无裂纹活动时刻光反射率变化速率直方图

    Figure  6.  Histogram of light reflectivity variation at the time without crack activity in AR0 region Histogram of light reflectivity variation

    图  7  光反射率突变点空间分布

    Figure  7.  Spatial distribution of mutation points of light reflectivity

    图  8  试件加载过程中光反射突变点分异系数变化曲线

    Figure  8.  The variation curve of differentiation coefficient of mutation points of light reflectivity during specimen loading process

    图  9  试件加载过程中声发射突变率变化曲线

    Figure  9.  The variation curve of acoustic emission mutation rate during specimen loading process

    图  10  裂纹发育、扩展瞬时信息

    Figure  10.  Instantaneous information of crack development and propagation

    图  11  裂纹发育、扩展累积信息

    Figure  11.  Accumulation information of crack development and propagation

    图  12  试件破坏过程中光反射率变化空间分布

    Figure  12.  Spatial distribution of light reflectivity changes during specimen failure

    图  13  基于光反射率突变的花岗岩试件裂纹提取结果

    Figure  13.  Crack extraction results of granite specimens based on mutation of light reflectivity

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  • 收稿日期:  2022-04-24
  • 修回日期:  2022-08-10
  • 网络出版日期:  2022-06-27

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