3D打印裂隙岩体动态力学性能及能量耗散规律初探

doi:10.13722/j.cnki.jrme.2021.0584

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Abstract Underground rock structures are often subjected to dynamic disturbances caused by earthquakes，explosions，impact vibrations，etc. Using the advantages of 3D printing technology to study the dynamic mechanical properties of rock under impact loads is of great significance to realize the application of 3D printing technology in the engineering field. Dynamic uniaxial compression tests were carried out on 3D printed rock specimens with prefabricated cracks by using f 50 mm variable cross section Hopkinson pressure bar device. The results show that the dynamic compressive strength of the specimens decreases first and then increases with increasing the prefabricated crack inclination angle，and when the prefabricated crack inclination angle is 30° and 90°，the strength of the specimens is the smallest and the largest，respectively. Compared with the static uniaxial compressive strength of the 3D printed rock specimens，it is found that the 3D printed sandy material has an obvious rate effect. When the strain rate is 139.65 s－1，the dynamic compressive strength of the 3D printed rock specimens is 4.34 times higher than the static compressive strength. The prefabricated crack defects intensify the energy dissipation and crushing process of the specimens to a certain extent，and the prefabricated cracks with a 30°inclination angle have the greatest influence. At the same time，the energy dissipation process and fragmentation of 3D printed rock specimens show obvious autocorrelation，and the relationship between the macroscopic crushing results and the energy dissipation of 3D printed sandy materials is similar to that of natural rock materials. The research lays a foundation for the feasibility of 3D printed materials to simulate natural rock in dynamic mechanical tests in the future.

Key words： rock mechanics 3D printing prefabricated cracks splitting Hopkinson pressure bar(SHPB) dynamic mechanical properties fractal dimension

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	TIAN Wei1
	2
	YU Chen1
	WANG Xiaohui1
	WU Pengfei1

Cite this article:

TIAN Wei1,2,YU Chen1, et al. A preliminary research on dynamic mechanical properties and energy dissipation rule of 3D printed fractured rock[J]. , 2022, 41(3): 446-456.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0584 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I3/446

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