期刊
ROCK MECHANICS AND ROCK ENGINEERING
卷 54, 期 8, 页码 3847-3871出版社
SPRINGER WIEN
DOI: 10.1007/s00603-021-02472-5
关键词
Crack mechanism; Digital image correlation; Crack location; Displacement jump
资金
- State Key Research Development Program of China [2017YFC0804203]
- International Partnership Program of Chinese Academy of Sciences [115242KYSB20160017]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-DQC029]
- Open Fund of the State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences [Z018001]
- Chinese Scholarship Council
A new method based on DIC technique is proposed to automatically trace discontinuities and quantitatively identify crack mechanisms, successfully locating and identifying crack types in red sandstone. This method avoids some ambiguity in crack mechanism identification, providing more objective results.
As a representative non-interferometric optical technique, the digital image correlation (DIC) can provide full-field displacement and strain measurement for the deformed rocks. However, the standard DIC technique has a limitation in measuring the displacements at the discontinuity and cannot be directly used for identifying the crack mechanism. Thus, a new DIC-based method is proposed for automatically tracing the discontinuities and quantitatively identifying the crack mechanism, i.e. mode I, mode II, and mixed-mode I/II. The new method involves three steps, including displacement measurement from the standard DIC technique, displacement field reconstruction at the discontinuity with the modified subset splitting technique, and post-processing for crack identification and displacement jump measurement. The effectiveness and robustness of the modified subset splitting technique and post-processing method have been verified with the synthetic images and theoretical displacement fields of mode I crack and dislocation. Then, the proposed method is utilized to locate cracks and quantitatively identify the crack mechanism of the initiated cracks in red sandstone containing a single flaw under uniaxial compression. The crack development in the flawed red sandstone specimens is analyzed and the crack types are summarized, in which wing cracks are in mode I, while horsetail cracks and anti-wing cracks are identified as mixed-mode I/II crack. It is shown that the new method avoids some ambiguous identification of crack mechanism and present more objective results.
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