Abstract
Dynamic mechanical characteristics of coral sand is of vital importance for foundation compaction. In the present study, a series of tests were conducted to estimate the dynamic behaviors of coral sand under drop weight impact. The coral sands with original and uniform gradations were impacted with different energies and different repeating times. The test results show that the dynamic force–displacement or the stress–strain response roughly undergoes the initial intense fluctuation, quasi-free fall, subsequent descending fluctuation and the inverse rebound periods. The reduction in the void ratio of coral sand increases with single impact energy increasing, while it decreases with the repetition of impact. The breakage of coral sand under impacting is progressive along the height of the sample, revealing by the multiple yield points in the e-logp curve. It is found that the predominant size fraction of fragmented particles corresponds well to the inflection interval of its initial PSD curve. The ratio of the dissipated energy to the absorbed energy generally reduces as the repetition of impact loading. The breakage index can be closely correlated to the dissipated energy. As compared to the original coral sand, the uniform coral sand exhibits more sensitive behaviors in terms of compressibility, particle crushing and energy dissipation. Furthermore, the scenario of few impacts at high energy level is proved to be more efficient than that of multiple impacts at low energy level in the reinforcement of coral sand.
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Acknowledgements
This research has been financed and supported by the National Natural Science Foundation of China (Grant No. 52222110) and Natural Science Foundation of Jiangsu Province of China (Grant No. BK20211230), which are greatly appreciated by the authors.
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Ma, L., Ke, J., Chen, T. et al. Dynamic mechanical behaviors of coral sand under drop weight impact. Acta Geotech. 19, 699–716 (2024). https://doi.org/10.1007/s11440-023-01911-7
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DOI: https://doi.org/10.1007/s11440-023-01911-7