北山花岗岩断裂力学行为及其声发射特征研究

doi:10.13722/j.cnki.jrme.2019.1103

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Abstract To investigate the fracture mechanical behaviours and acoustic emission characteristics of Beishan granites，the MTS815 Flex Test GT rock mechanics testing system and acoustic emission(AE) three-dimensional positioning monitoring system are used to conduct Cracked Chevron Notched Brazilian Disc CCNBD tests with two different loading modes(static loading and cyclic loading). Experimental results show that mean value of KIC under static loading is 1.180 MPa?m1/2，while mean value of KIC under cyclic loading is 1.153 MPa?m1/2，which is reduced by 2.3%. The existence of subcritical crack growth is verified by cyclic loading test，and it is turned out that the failure mode of CCNBD specimens under cyclic loading do not change，the specimens are still brittle. Based on the mechanical characteristic curves and acoustic emission characteristics，the fracture propagation process and fracture characteristics of CCNBD specimens under static and cyclic loading are studied.

Key words： rock mechanics CCNBD Beishan granite fracture toughness acoustic emission cyclic loading

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	Articles by authors
	LIU Liang1
	DU Guangyin1
	LI Erbing2
	GUO Qian1
	XIA Han1

Cite this article:

LIU Liang1,DU Guangyin1,LI Erbing2, et al. Fracture mechanical behaviors and acoustic emission characteristics of Beishan granite under CCNBD test[J]. , 2020, 39(S2): 3237-3244.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1103 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS2/3237

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