Abstract
X-ray micro-tomography (XMT) is an efficient technique for non-destructive imaging of morphological structures. It is suitable for monitoring local displacement fields of heterogeneous materials. Digital volume correlation (DVC) methods are widely used for the quantification of local strain fields from highly contrasted XMT images. The aim of this work is to investigate strain localization and cracking process in a hard clayey rock. For this purpose, three-dimensional images have been taken by in situ X-ray micro-tomography on a tested sample under different loading levels and time steps. These images are analyzed with a DVC based method to calculate both local strain fields and averaged global strains. In particular, the progressive localization of strain field with applied stress and creep time is investigated in relation with material heterogeneities. It is found that the strain field localization as well as the cracking process is clearly influenced by the presence of stiff inclusions, pores, weak clayey zones and layered microscopic structure of claystone.
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Acknowledgements
The present study was jointly supported by Andra and the ISIS4D X-Ray CT platform. This platform has been funded by the International Campus on Safety and Inter-modality in Transportation (CISIT), the Hauts-de-France Region, the European Community and the National Center for Scientific Research (CNRS). Special thanks are addressed to Jean-Pierre Parent and Jean Secq for their invaluable assistance to the design of experimental device and preparation of samples.
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Shi, HL., Hosdez, J., Rougelot, T. et al. Analysis of Local Creep Strain Field and Cracking Process in Claystone by X-Ray Micro-Tomography and Digital Volume Correlation. Rock Mech Rock Eng 54, 1937–1952 (2021). https://doi.org/10.1007/s00603-021-02375-5
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DOI: https://doi.org/10.1007/s00603-021-02375-5