Abstract
The concrete of the deep mine shaft lining often produces a phenomenon similar to rock-burst, and basalt fiber has good crack resistance and is widely used in engineering construction. From the perspective of concrete dynamics, this paper conducts dynamic tests on ordinary concrete and basalt fiber reinforced concrete (BFRC) by using a Split Hopkinson Bar (SHPB) with a diameter of 80 mm. To accurately assess the brittleness of concrete under rock-burst, this paper comprehensively considers the energy evolution characteristics of concrete before and after the peak, and establishes a brittleness index evaluation method based on the full stress–strain curve that can reflect the deformation and failure process of concrete. The evolution law of total energy, elastic strain energy and dissipated energy in the failure process of specimens under impact load is explored. The results show that the higher the impact rate, the more the total energy absorbed by the concrete, and the incorporation of basalt fiber changes the internal pore structure of the concrete, making the total absorbed energy and dissipated energy of BFRC larger, but the effective energy ratio is smaller. Meanwhile, under the same impact air pressure, the brittleness index of BFRC is lower than that of ordinary concrete (PC). The brittleness index and fractal dimension of concrete have a positively correlated with strain rate. The incorporation of basalt fiber can improve the toughness of concrete and improve the ability of concrete to resist damage. The research results are expected to provide a reference for the brittleness evaluation of concrete under impact load.
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China (Nos. 51679197, 52079109). Leadership Talent Project of Shaanxi Province High-Level Talents Special Support Program in Science and Technology Innovation (Nos. 2017-TZ0097) and the Natural Science Foundation of Shaanxi Province (Nos. 2017JZ013).
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Geng, K., Chai, J., Qin, Y. et al. Exploring the brittleness and fractal characteristics of basalt fiber reinforced concrete under impact load based on the principle of energy dissipation. Mater Struct 55, 78 (2022). https://doi.org/10.1617/s11527-022-01891-2
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DOI: https://doi.org/10.1617/s11527-022-01891-2