高径比差异条件下花岗岩岩石动态冲击压缩特性

doi:10.13722/j.cnki.jrme.2020.1163

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Abstract In order to study the rock strength size effect under dynamic impact，nine groups of granite samples with different length-diameter ratios(0.5，0.6，0.7，0.8，0.9，1.0，1.2，1.5 and 2.0) were prepared，and dynamic impact compression tests were carried out under different impact speeds using f 50 mm split Hopkinson bar (SPHB). The mechanical properties of granite specimens with different length-diameter ratios were studied，and the absorption energy of the broken specimens was analyzed. The results show that，under three impact velocity compression conditions，the maximum differences of the compressive strength of the samples with different length-diameter ratios are 10.88%，3.95% and 8.17%，respectively，and that，under the same impact velocity，the compressive strength does not change obviously with the change of the length-diameter ratio. The length-diameter ratio of the rock specimens is negatively correlated with the peak strain of the rock specimens，and the fitting data curve shows that there is a certain nonlinear relationship between them. The length-diameter ratio of the specimens is positively correlated with the elastic modulus，and the fitting data curve shows that there is a good linear relationship between them. The failure shapes of the rock specimens with different length-diameter ratios are different while the failure forms are basically the same. The magnitude of the incident energy is related to the impact velocity but independent of the length-diameter ratio of the rock specimens. The fitting curves between the reflected energy and the transmitted energy with the length-diameter ratio are contrary. The absorbed energy of rock specimen breakage does not change significantly with the length-diameter ratio，but the absorbed energy per unit length of rock specimen breakage decreases with increasing the length.

Key words： rock mechanics strength size effect length-diameter ratio granite specimen mechanical properties absorbed energy

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	Articles by authors
	ZHAO Guangming1
	2
	ZHOU Jun1
	2
	MENG Xiangrui1
	2
	KAO Siming1
	2
	ZHANG Ruofei1
	2
	HUANG Shunjie1
	2

Cite this article:

ZHAO Guangming1,2,ZHOU Jun1, et al. Dynamic impact compression characteristics of granite rocks with different length-diameter ratios[J]. , 2021, 40(7): 1392-1401.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1163 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I7/1392

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