动静加载条件下花岗岩声发射b值特征的研究

doi:10.13722/j.cnki.jrme.2016.0272

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Abstract In order to study the b-value characteristics of rock acoustic emission(AE) under different loading conditions，the split Hopkinson pressure bar(SHPB) system and MTS322 servo-controlled rock mechanical test system were employed respectively to carry out the impact loading tests and uniaxial compression tests at different loading rates. The results show that b-value under impact loading is smaller than the one under static loading，and the b-value decreases gradually with the increase of loading rate. In the uniaxial compression tests at different loading rates，the fluctuation range of dynamic b-value increases with the increase of loading rate，and the b-value decreases sharply as load reaches the peak stress of specimen. Furthermore，in impact loading tests，the fragmentation of specimen varies cause of the differences of their strength and composition，and the b-value is larger when the degree of fragmentation is higher，therefore，the b-value can be used as a fragmentation evaluation index of rock under impact loading.

Key words： rock mechanics rock acoustic emission b-value split Hopkinson pressure bar(SHPB) loading rate rock fragmentation

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	Articles by authors
	LIU Xiling
	PAN Mengcheng
	LI Xibing
	WANG Jinpeng

Cite this article:

LIU Xiling,PAN Mengcheng,LI Xibing, et al. Acoustic emission b-value characteristics of granite under dynamic loading and static loading[J]. , 2017, 36(S1): 3148-3155.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0272 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3148

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