Abstract
The mechanical behavior of carbon dioxide (CO2)-containing sediments is crucial for the implementation of carbon dioxide storage in the ocean. Current research overlooks the effects of non-uniform deformation on the evaluation of mechanical properties in triaxial tests. In this study, a triaxial testing system equipped with digital image technology of the specimen global surface was used to test the triaxial behaviors of Bohai sand containing CO2 - CO2 hydrates. On this basis, the strain localization, shear band formation, and evolution behavior of the CO2-bearing sediments were analyzed, according to the surface deformation of the triaxial specimens. The results show that the mean values of axial strain, lateral strain, and volumetric strain of CDBS specimens are higher than the global values. The local destructive stress and the local effective internal friction angle φ of the specimens are smaller than the global values. The sample’s shear bands may be generated multiple times and are negatively correlated with the mean stress σ m. This study concluded that the global stress-strain curves overestimated the strength of the CDBS samples and underestimated the deformation of the samples. This was due to the inhomogeneous deformation of the samples.
Published Version
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