加卸载条件下冲击性岩石动态力学特性研究

doi:10.13722/j.cnki.jrme.2023.0625

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Abstract To investigate the influence of the main roof's periodic weighting path on the dynamic characteristics of impact pillars，dynamic compression experiments were conducted on the impact sandstones which were preprocessed with different cyclic loading and unloading，by using the split Hopkinson pressure bar. The effects of the cyclic loading and unloading paths and the impact pressure on the fracture strength，energy dissipation and fragmentation distribution of rock samples were discussed. The results show that the dynamic stress-strain curve can be divided into the elastic deformation stage，the unstable fracture development stage and the post-fracture stage. In the unstable fracture development stage，the strain hardening phenomenon and the leaping characteristic are obvious. In the post-fracture stage，the damage degree of rock samples is positively correlated with the impact pressure. The reflected energy density，the transmitted energy density and the dissipated energy density increase linearly with the incident energy. The average reflected energy density and average dissipated energy density decrease first and then increase with the upper cyclic stress，showing a "U"-shaped varying characteristic. The higher the rock sample density is，the smaller the reflected energy density and the dissipated energy density are. By contrast，the transmitted energy is larger. Under the impact loading，the rock samples mainly show the crushing failure，the rock fragmentation，the rock side spalling and the rock splitting. The severer the impact disturbance is，the smaller the average particle size. By contrast，the average fractal dimension of the rock samples is larger. The rock samples are destroyed more thorough. The rock debris are distributed more uniformly.

Key words： rock mechanics loading and unloading condition impact sandstones strength character destruction energy consumption fragmentation distribution

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	CHEN Jianhang
	ZENG Banquan
	ZHANG Junwen

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CHEN Jianhang,ZENG Banquan,ZHANG Junwen. Dynamic mechanical performance of impact rocks under loading and unloading condition[J]. , 2024, 43(10): 2430-2442.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0625 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2430

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