Abstract
The mechanical behavior and failure mode of deep-buried rocks are key issues to the safety of deep underground engineering. In this study, a series of acoustic emission (AE) monitored triaxial compression tests on the marble samples were firstly conducted. Then, the effects of confining pressure on the mechanical characteristics were analyzed. Finally, the failure mechanism of the marble was revealed by using micro-computerized tomography (CT) scanning technique. It is found that the elastic modulus of marble samples increases non-linearly with the increase of confining pressure, but Poisson’s ratio decreases exponentially. The shape of deviatoric stress-axial strain curve changes from elastic-brittle to elastic-plastic gradually, and the deviatoric stress-volumetric strain curve changes from compression-dilatancy to complete-compression. The strength and deformation parameters at key points on compressive curves are much correlative with confining pressure, but their sensitivities to confining pressure are different in the pre-peak and post-peak stages. The power function Bieniawski criterion can well describe the strength at the key points in the pre-peak stage. Hoek-Brown and Mohr-Coulomb criteria show a high fitting degree for the strength at zero volumetric strain point and the residual strength in the post-peak stage, respectively. Both crack sketch and micro-CT scanning reveal the change of failure modes of the marble samples from axial splitting to shear failure. The number of microscopically observable cracks decreases first and then increases. The secondary microcracks are detected in the samples under high confining pressure. These results may provide good references to the design and construction of deep rock mass engineering.
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This study was financially supported by the Yalong River Joint Fund of National Natural Science Foundation of China (U1965101) and National Natural Science Foundation of China (12272119, 51579062), which are gratefully appreciated.
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Highlights
• The types of deviatoric stress-axial stain and deviatoric stress-volumetric strain curves of marble samples under triaxial compression were investigated.
• The effects of confining pressure on the stress and deformation characteristics of key points at the pre- and post-peak stages of marble samples were contrasted and analyzed.
• Combined with the acoustic emission and micro-CT scanning, the failure characteristics and mechanism of marble were studied.
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Li, S., Wang, Z., Wang, J. et al. Analysis on mechanical behavior and progressive failure of deep-buried marble based on complete stress-strain curves. Bull Eng Geol Environ 82, 133 (2023). https://doi.org/10.1007/s10064-023-03123-5
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DOI: https://doi.org/10.1007/s10064-023-03123-5