Abstract
Deep Rocks are in a natural environment featuring in-situ stress and pore pressure, and their dynamic mechanical properties are of great significance to deep resource and energy exploitation. In this study, a novel experimental system for determining the dynamic compressive response of deep rocks is developed. The experimental system consists of a split Hopkinson pressure bar dynamic loading system, a specially designed pore pressure loading cell, and a data acquisition system. A green sandstone (GS) was tested to validate the system. The experimental results show that the dynamic compressive strength of GS increases with the loading rate and the confining pressure but decreases with the pore pressure. In addition, single shear failure and X-type conjugate shear failure are the most common dynamic failure modes under hydrostatic confinement and pore pressure conditions. Based on the Mohr-Coulomb failure criterion, the internal friction angle can be considered as a constant, whereas the cohesion has a strong dependence on the loading rate but is independent of the pore pressure and confining pressure. The free water has a bidirectional effect on the dynamic strength, i.e., the water-wedge effect facilitates the crack propagation and then reduces the rock strength, while the Stefan effect impedes the damage of the pore structure and has an enhancing effect on the dynamic strength. The experimental results prove that the developed system is reliable and flexible for quantifying the dynamic compressive response of deep rocks considering the confinement and the pore pressure.
Article highlights
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A triaxial SHPB system for determining the dynamic strength of rocks subjected to coupled hydraulic-mechanical loading is developed and verified.
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The dynamic compressive strength and failure characteristics of rocks under pore pressure and confinement conditions are investigated.
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The influencing mechanism of pore pressure on the dynamic strength is revealed.
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Acknowledgements
This work has been supported by the Natural Science Foundation of China (NSFC) under Grants #51879184 and #52079091. K.X. acknowledges financial support by the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Discovery Grant #72031326.
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Zhao, G., Li, X., Xu, Y. et al. A modified triaxial split Hopkinson pressure bar (SHPB) system for quantifying the dynamic compressive response of porous rocks subjected to coupled hydraulic-mechanical loading. Geomech. Geophys. Geo-energ. Geo-resour. 8, 29 (2022). https://doi.org/10.1007/s40948-021-00335-5
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DOI: https://doi.org/10.1007/s40948-021-00335-5