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Volume 37 Issue 5
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ZHAO Cheng, BAO Chong, Matsuda Hiroshi, ZHAO Chun-feng, TIAN Jia-shen. Application of digital image correlation method in experimental research on crack propagation of brittle rock[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(5): 944-951. DOI: 10.11779/CJGE201505022
Citation: ZHAO Cheng, BAO Chong, Matsuda Hiroshi, ZHAO Chun-feng, TIAN Jia-shen. Application of digital image correlation method in experimental research on crack propagation of brittle rock[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(5): 944-951. DOI: 10.11779/CJGE201505022
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Application of digital image correlation method in experimental research on crack propagation of brittle rock

  • 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Department of Structural Engineering, Nagasaki University, Nagasaki, 852-8521 Japan

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  • Received Date: August 29, 2014
  • Published Date: May 19, 2015
    Graphical Abstract
    • Abstract
  • Under uniaxial compression, wing crack initiates and propagates in the flawed rock, and the damage evolves. The uniaxial compression tests are carried out on rock-like brittle specimens, each containing a single flaw. Two high-resolution camera are used to capture images to get the global strain fields of the specimens using digital image correlation (DIC) technology. Micro-crack zone is observed obviously at the flaw tip, whose shape is an ellipse with an inclination of 82° with flaw. When the load increases to 85.6% of the maximum load, the micro-crack nucleates, and the macro wing crack initiates at the flaw tip. The cracking propagation is a process of micro-crack development and nucleation, as well as a process of high-strain area spreading. The development of the secondary micro-crack zone and the anti-wing micro-crack zone is very slow. Meanwhile, they are affected by the tensile stress. Therefore, the wing crack is the main crack pattern. Furthermore, the change of stress and strain around the tip is compared based on LEFM. It proves more effective to use the strain approach to investigate crack initiation and propagation. And the reliability of DIC system is verified through theoretical analysis.
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