基于图像检索技术的受载煤样裂隙演化规律
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

TD712

基金项目:


Fracture evolution law of loaded coal samples based on image retrieval technology
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    在煤岩试样破坏过程中进行CT扫描测试,可实现煤岩试样内部裂隙结构可视化表征,但是在加载过程中,因试样位移变形,会引起扫描层定位不准确,进而影响试验结果。为了解决这一问题,笔者利用图像相似性检索技术,检索出受载试样在不同应力水平下的最相似的CT图像,从而更加准确的描述受载煤样裂隙演化规律。研究结果表明:(1) 在三轴压缩破坏过程中,试样应力应变曲线分为5个明显的阶段,即初始压密阶段、线弹性变形阶段、塑性屈服阶段、峰值破坏阶段以及残余变形阶段。(2) 基于感知哈希算法的图像检索技术能够准确识别并定位不同应力阶段相似度最高的CT图像,且CT图像相似度随着轴向荷载不断增大而逐渐降低。(3) 在整个三轴加载过程中,CT图像的相似度绝对差均值表现出两个明显的变化阶段:缓慢增加阶段和快速增加阶段。(4) 分形维数可以定量描述裂隙演化,受载样品破坏过程中分形维数主要经历了缓慢减小,缓慢增大,快速增大三个阶段。

    Abstract:

    CT scan test during the destruction of coal rock specimens can realize the visual characterization of the internal fracture structure of coal rock specimens, but during the loading process, the displacement and deformation of the specimens can cause inaccurate positioning of the scanned layers, which in turn affects the test results. To solve this problem, the author used image similarity retrieval technique to retrieve the most similar CT images of the loaded specimens at different stress levels, so as to more accurately describe the fracture evolution law of the loaded coal samples. The results show that (1) during triaxial compression damage, the specimen stress-strain curve was divided into five distinct phases: the initial compression-density phase, linear elastic deformation phase, plastic yielding phase, peak damage phase, and residual deformation phase. (2) The image retrieval technique based on perceptual hash algorithm could accurately identify and locate the CT images with the highest similarity at different stress stages, and the similarity of CT images gradually decreased with increasing axial load. (3) During the whole triaxial loading process, the mean value of the absolute difference of similarity of CT images exhibited two obvious stages of change: the slowly increasing stage and the rapidly increasing stage. (4) The fractal dimension can quantitatively describe the fracture evolution, and the fractal dimension mainly went through three stages of slow decrease, slow increase and rapid increase during the damage of loaded samples.

    参考文献
    相似文献
    引证文献
引用本文

张沛. 基于图像检索技术的受载煤样裂隙演化规律[J]. 科学技术与工程, 2024, 24(13): 5344-5349.
Pei Zhang. Fracture evolution law of loaded coal samples based on image retrieval technology[J]. Science Technology and Engineering,2024,24(13):5344-5349.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2023-06-13
  • 最后修改日期:2023-10-04
  • 录用日期:2023-10-10
  • 在线发布日期: 2024-05-17
  • 出版日期:
×
亟待确认版面费归属稿件,敬请作者关注
《科学技术与工程》入选维普《中文科技期刊数据库》自然科学类期刊月度下载排行榜TOP10