冲击荷载下岩石裂纹动态扩展全过程演化规律研究

doi:10.13722/j.cnki.jrme.2018.1172

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Abstract In order to study the mechanism of crack propagation in complete process and crack arrest behavior in set area between two holes，an ISCSC(improved single cleavage semi-circle specimen) configuration specimen was proposed. By using split Hopkinson pressure bar，the impact experiment was conducted with the crack propagation velocity detected by the crack propagation gauge. Meanwhile，the damage failure model combining principal stress failure criteria with crack softening failure criteria was introduced in the numerical simulation. With Experiment-Numerical method，the evolution law of rock crack dynamic propagation in complete process was investigated elaborately and the effect of two empty holes on crack propagation behavior was sophisticated demonstrated. The results show that the ISCSC configuration specimen could realize the crack arrested in set area and that the arrest zone can be predicted accurately. Two empty holes have huge influence on the behavior of crack propagation，restraining crack propagation velocity obviously. The interaction of the superimposed stress field between two empty holes and the tensile stress field of the crack tip could slow down the crack propagation speed sharply and even cause arrest when the running crack rushes into the set area between two holes. When the running crack goes across the set area between two holes，the crack propagation behavior could be influenced by inhomogeneity of material easier than before，which could cause crack deflecting and branching. It is also shown that numerical simulation outputs agree well with the results of experiment，confirming that ISCSC configuration specimen has great ability to be applied in researching the behavior of crack propagation in complete process.

Key words： rock mechanics ISCSC configuration split Hopkinson pressure bar crack propagation crack arrest numerical simulation

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	Articles by authors
	WANG Fei1
	WANG Meng1
	ZHU Zheming1
	QIU Hao1
	YING Peng1
	WANG Xuya2

Cite this article:

WANG Fei1,WANG Meng1,ZHU Zheming1, et al. Study on evolution law of rock crack dynamic propagation in complete#br# process under impact loading[J]. , 2019, 38(6): 1139-1148.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1172 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I6/1139

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