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Experimental study on strength and failure behavior of transversely isotropic rock-like material under uniaxial compression

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Abstract

This study prepared transversely isotropic rock-like specimens in three groups of layer thickness ratios, alternating with two kinds of rock-like materials. The conventional triaxial compression tests confirm mechanical difference of the two rock-like materials. The velocities of ultrasonic wave (longitudinal wave VP) are measured for each transversely isotropic rock-like specimen before uniaxial compressive test, the results present an anisotropic behavior with the degree of longitudinal wave velocity anisotropy (VPmax/VPmin) of the three groups of transversely isotropic rock-like specimens are 1.44, 1.08 and 1.09, respectively. The uniaxial compression test indicates that the strength variation of the three groups of transversely isotropic rock-like specimens are “U-shaped”, with the degree of strength anisotropy (σcmax/σcmin) are 2.35, 4.42 and 2.08, respectively. An empirical failure criterion introduced by Jaeger and modified by Donath predicts the failure strength of transversely isotropic rock-like specimen well. The acoustic emission result shows that the AE ringing count is significant to the surface crack extending. The failure pattern of transversely isotropic rock-like specimens can be classified into one of the following three modes: (a) tensile-split along the core axes when small bedding angle (0°, 15°, 30°), (b) shear-sliding along the bedding plane when major bedding angle (45°, 60°, 75°) and (c) split along the vertical bedding plane when bedding angle of 90°.

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Acknowledgements

This research was supported by the Fundamental Research Funds for the Central Universities (2020ZDPYMS34).

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Correspondence to Sheng-Qi Yang.

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On behalf of all authors, the corresponding author states that there is no conflict of interest. No conflict of interest exists in the submission of this manuscript. I would like to declare on behalf of my co-authors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere. All the authors listed have approved the manuscript that is enclosed.

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Yin, PF., Yang, SQ. Experimental study on strength and failure behavior of transversely isotropic rock-like material under uniaxial compression. Geomech. Geophys. Geo-energ. Geo-resour. 6, 44 (2020). https://doi.org/10.1007/s40948-020-00168-8

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