Abstract
Water content plays a significant role in the dynamic mechanical properties of rocks in hydraulic, deep underground, and mining engineering. However, the previous study generally concentrated on the oven-dried and water-saturated rock with spherical pores. Therefore, this study aims to investigate the impact of different water saturation levels and microstructure on the dynamic mechanical properties of artificial porous rock (APR) with multi cracks. The specimens with six water saturation levels (100%, 80%, 60%, 40%, 20%, and 0%) were tested under various loading rates using a split Hopkinson pressure bar (SHPB). The obtained results include the typical failure modes, stress–strain curves, dynamic uniaxial compressive strength (DUCS), fragmentation performance, and energy dissipation. The findings indicate that the DUCSs of unsaturated specimens initially increase with water saturation (20% ~ 80%) but subsequently decrease to the lowest value under fully saturated conditions. The dissipated energies of wet specimens are higher than that of dry specimens. Moreover, the dry specimen is prone to fail in a rock burst pattern, whereas the wet specimens exhibit a pulverization pattern. In addition, the corresponding water-effect mechanisms are discussed based on the microstructure of the APR.
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Data Availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC) under Grants # 52079091 and # 42141010, and the Natural Science Foundation of Tianjin under Grants # 21JCZXJC00040.
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Xu, Y., Lin, S., Jiang, L. et al. Dynamic mechanical characteristics of an artificial porous granite under various water saturation levels. Bull Eng Geol Environ 83, 20 (2024). https://doi.org/10.1007/s10064-023-03483-y
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DOI: https://doi.org/10.1007/s10064-023-03483-y