冲击荷载下花岗岩层裂断口细–微观试验研究

doi:10.13722/j.cnki.jrme.2019.0319

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Abstract To comprehensively research the characteristics of mesoscopic minerals and microscopic fractures of granite，the split Hopkinson bar(SHPB) device was employed to perform the spalling experiments of granite rods under different impact loads. The mesostructure of minerals was studied by crystal mineralogy，the meso-crack propagation was recorded by a high-speed camera，and the microstructure of the fracture surface of the samples was observed by energy dispersive spectrometer(EDS) and scanning electron microscopy(SEM). The roughness of the fracture was calculated quantitatively with the fractal principle. The experimental results show that the mesostructure of granite minerals has an important influence on the spallation failure，especially for feldspar，quartz and mica which are the main components of granite. The distribution of these minerals also affects the expansion of mesoscopic cracks. It is also demonstrated from the microscopic analysis of EDS and SEM images that different minerals present different micro-fracture characteristics and that the fragmentation degree and roughness of the fracture increase with increasing the impact load，which was greatly validated by the fractal dimension values.

Key words： rock mechanics mineralogical identification energy dispersive spectroscopy scanning electron microscope spall fractography fractal dimension

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	Articles by authors
	TAO Ming
	WANG Jun
	LI Zhanwen
	HONG Zhixian
	WANG Yiqing
	ZHAO Rui

Cite this article:

TAO Ming,WANG Jun,LI Zhanwen, et al. Meso-and micro-experimental research on the fracture of granite spallation under impact loads[J]. , 2019, 38(11): 2172-2181.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0319 OR http://www.rockmech.org/EN/Y2019/V38/I11/2172

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