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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摘要地下岩体结构经常遭受到地震、爆炸、冲击振动等产生的动力扰动，利用3D打印技术的优势研究冲击荷载下岩体动态力学性能对实现3D打印技术在工程领域的应用具有重要意义。采用f 50 mm的变截面霍普金森压杆(SHPB)装置，对含预制裂隙的3D打印岩体试样进行动态单轴压缩试验。研究结果表明：试样的动态抗压强度随着预制裂隙倾角的增大呈现出先减小后增大的趋势，当预制裂隙倾角为30°时试样强度最小，当预制裂隙倾角为90°时试样强度最大。与3D打印岩体试样的静态单轴压缩强度对比发现，3D打印砂性材料具有明显的率效应，当应变率为139.65 s－1时，3D打印岩体试样的动态抗压强度是静态抗压强度的4.34倍。预制裂隙缺陷在一定程度上加剧了试样的能量耗散和破碎过程，并且30°倾角预制裂隙对试样能量耗散和破碎结果的影响程度最大。同时，3D打印岩体试样的能量耗散过程与破碎块度表现出明显的自相关性，所用的3D打印砂性材料的宏观破碎结果与能量耗散之间的关系与天然岩石材料有一定相似性，为今后3D打印材料模拟天然岩体应用于动态力学试验的可行性奠定了基础。

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	田威1
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	余宸1
	王肖辉1
	吴鹏飞1

关键词 ：岩石力学, 3D打印, 预制裂隙, 分离式霍普金森压杆(SHPB), 动态力学性能, 分形维数

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

引用本文:

田威1，2，余宸1，王肖辉1，吴鹏飞1. 3D打印裂隙岩体动态力学性能及能量耗散规律初探[J]. 岩石力学与工程学报, 2022, 41(3): 446-456.
TIAN Wei1，2，YU Chen1，WANG Xiaohui1，WU Pengfei1. A preliminary research on dynamic mechanical properties and energy dissipation rule of 3D printed fractured rock. , 2022, 41(3): 446-456.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0584 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I3/446

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