土工基础

土工基础 ›› 2023, Vol. 37 ›› Issue (4): 624-628.

• 专题论述 • 上一篇    下一篇

基于Hough变换的煤岩孔隙提取及三维重构

周 洲1，赵磊磊1，雷旭东1，彭瑞东1，2   

  1. （1.中国矿业大学（北京）力学与建筑工程学院，北京 100083；2.中国矿业大学（北京）煤炭资源与安全开采国家重点实验室，北京 100083）
  • 收稿日期:2022-02-22 修回日期:2022-03-04 出版日期:2023-08-31 发布日期:2023-09-01
  • 作者简介:周洲（1997-），女，硕士研究生，研究方向为现代光测技术及图像处理。
  • 基金资助:
    中央高校基本科研业务费专项资金(项目编号：2020YJSMT06)

Coal Rock Porosity Property Extraction and Three 3D Reconstruction Using Hough Transformation

ZHOU Zhou1, ZHAO Leilei1, LEI Xudong1， PENG Ruidong1,2   

  1. (1.College of Mechanics and Architectural Engineering, China University of Mining Technology, Beijing 100083； 2.State Key Laboratory for Coal Resource and Safe Coal Extraction, China University of Mining Technology, Beijing 100083)
  • Received:2022-02-22 Revised:2022-03-04 Online:2023-08-31 Published:2023-09-01

摘要： 选择天然煤岩标准试样作为研究对象，进行煤岩单轴压缩破坏前后的CT扫描试验，对CT扫描图像进行基于Hough变换的孔隙提取，在阈值分割法的基础上对煤岩体内部细观结构进行三维重构。相较于传统三维重构方法，该孔隙提取方法的三维重构更好地表征了煤岩体的损伤特性，有更大的应用范围。将由该方法得到的三维重构几何体代入COMSOL中进行数值模拟计算，结果表明：①采用Hough变换进行圆形检测能获取孔隙的坐标和半径，进而得到孔隙的空间分布特征；②煤岩的初始损伤极大的降低了煤岩的强度；③由含孔隙三维重构体的弹塑性损伤模型得到的应力应变曲线和煤岩单轴压缩实验的应力应变曲线更为近似，从而验证了该孔隙提取方法的准确性。

关键词: Hough变换, CT扫描, 孔隙提取, 三维重构, 岩石损伤

Abstract: A series of CT scan tests were performed on the standard coal rock samples before and after the unconfined compressive strength tests. The porosity in the coal rock samples is extracted from the CT scan images by using Hough transformation. The micro porosity structures in the standard coal rock samples are three dimensional reconstructed by adjusting the threshold values. Comparing with the conventional threedimensional reconstruction methods, the porosity extraction method has a wider application and has a better presentation of the internal damage in the standard coal rock sample. The reconstructed 3D structure is used in the numerical analysis in COMSOL model. The results indicate that, 1) the size and distribution of the porosity can be obtained from the Hough transformation; 2) The initial damage in the coal rock samples significantly reduces the strength of the coal rock samples 3) The stressstrain curves obtained from the elastoplastic threedimensional porosity reconstruction are similar to that of curves from the unconfined compressive test so that the accuracy of the porosity extraction method is therefore verified.

Key words: Hough Transformation, CT Scan, Porosity Extraction, 3D Reconstruction, Rock Damage

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