Experimental study on the dynamic mechanical behavior and energy dissipation characteristics of deep rock under coupled impact loading and hydrostatic pre-stress

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (6) : 280-288.

FANG Shizheng1, LI Weiyu2, YANG Yang1, CHEN Cheng1, XU Peng3

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Abstract

With the development of deep rock engineering, the mechanical response of rock under in-situ stress needs to be studied. In this study, the dynamic characteristics of deep rock under hydrostatic pre-stress is carried out by using the split Hopkinson pressure bar (SHPB) experimental system. The effects of hydrostatic pre-stress and dynamic load rate on rock dynamic strength and dissipated energy are analyzed, and the rock failure characteristics are also studied. Results show that the dynamic strength of rock shows a significant rate effect, which increases with the increase of impact air pressure, showing a linear positive correlation; and it will increase nonlinearly with the increase of hydrostatic pre-stress, and has a well correlation after binomial fitting. As to energy evolution, it is found that the energy absorption proportion of rock increases with the increase of impact air pressure, and the hydrostatic pre-stress has an opposite effect on the rock energy absorption proportion, which reflects the constraint effect of hydrostatic pre-stress on rock deformation. Finally, the rock apparent failure mode is analyzed. It is found that the rock failure is mainly controlled by shear cracks at low hydrostatic pre-stress. With the increase of hydrostatic pre-stress, shear crack and circular crack appear simultaneously in the sample. The research results can provide basic parameters for deep rock engineering construction.

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Hydrostatic pre-stress / Deep / split Hopkinson pressure bar (SHPB) / Dynamic strength / Energy dissipation

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FANG Shizheng1, LI Weiyu2, YANG Yang1, CHEN Cheng1, XU Peng3. Experimental study on the dynamic mechanical behavior and energy dissipation characteristics of deep rock under coupled impact loading and hydrostatic pre-stress[J]. Journal of Vibration and Shock, 2023, 42(6): 280-288

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