Abstract
In this study, three-dimensional non-uniform strain fields and cracking patterns of a clay-rich rock are investigated. Uniaxial compression creep tests are performed on samples drilled in five different orientations with respect to bedding planes. A digital volume correlation method is applied to X-ray micro-tomographic images taken during the creep tests to calculate both full local strain fields and average global strains. Both instantaneous and time-dependent strains, respectively, induced by applied stress and creep mechanism are analysed. Strain heterogeneity inside samples is quantified by calculating strain concentration zones, which are correlated with the presence of stiff inclusions. Cracking patterns of samples are characterized through reconstructed X-ray micro-tomographic images. Correlations between major cracking patterns and strain concentration zones are investigated.
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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, H.L., Hosdez, J., Rougelot, T. et al. Influences of structural anisotropy and heterogeneity on three-dimensional strain fields and cracking patterns of a clay-rich rock. Acta Geotech. 16, 2175–2187 (2021). https://doi.org/10.1007/s11440-021-01152-6
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DOI: https://doi.org/10.1007/s11440-021-01152-6