Effects of strength ratio on energy dissipation of quasi-composite rock samples under impact load

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (13) : 111-118.

WEN Sen1,2, WU Fei1, LI Sheng1, SHENG Guilin1,2

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Abstract

The dynamic impact test of composite rock samples was carried out by using the split Hopkinson pressure bar test device with a diameter of 50 mm. The effects of different strain rates, different incident sequences of incident waves, different strength ratios and different incident angles on the energy dissipation of rock mass were studied. The test results show that the incident energy, absorption energy and energy utilization rate of composite rock samples increase with the increase of strain rate. Different incident order has different influence on absorption energy and energy utilization rate, and with the increase of intensity ratio, the influence of different incident order decreases gradually. When the strain rate is about 270s−1, the energy utilization rates of composite rocks samples with different strength ratios decrease first and then increase with the increase of incident angle. When the incident angle is 30°, the energy utilization rate is the smallest, and when the incident angle is 90°, the energy utilization rate is the largest.

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split Hopkinson pressure bar (SHPB) / composite rock samples / different incidence angles / strength ratios / energy dissipation

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WEN Sen1,2, WU Fei1, LI Sheng1, SHENG Guilin1,2. Effects of strength ratio on energy dissipation of quasi-composite rock samples under impact load[J]. Journal of Vibration and Shock, 2023, 42(13): 111-118

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