单裂隙花岗岩破坏强度及裂纹扩展特征研究

doi:10.13722/j.cnki.jrme.2018.1151

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Abstract In order to study the strength characteristics and failure process of fractured rocks，uniaxial compression tests together with AE monitoring were conducted on granites containing a single fissure. The stress-strain data，multi-parameters of AE and video recording were used to analyze the characteristics of crack evolution and their correlations. The results show that the fissure angle has a bigger influence on crack initiation stress and failure strength. The modulus and crack initiation stress increase monotonously with . The stress-strain curves of fractured rocks rise stepwise before the peak strength，and stress drop occurs several times when is small. It?s revealed that the stress drop coincides with the deterioration of modulus，sharp bulge of AE event rate and energy rate. AE event evolution of fractured granites is divided into three stages，with the increase of ，the three-stages characteristic gradually weakens and the brittle failure increases. Moreover，the number of stress drop and AE bulges gradually decrease，but stress levels corresponding to the maximum of AE rate keep increasing. Compared with AE event，the maximum energy rate occurs closer to the peak stress，and AE energy changes more severely. The spatiotemporal evolution of AE hypocenters depicts the three-dimensional propagation region and distribution of cracks. The amplitude of hypocenters occurred at the stable growth period are small，and the number of large-amplitude hypocenters increases rapidly after the high-speed growth period，especially prior to the failure.

Key words： rock mechanics failure strength acoustic emission hypocenter distribution crack propagation

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	Articles by authors
	ZHANG Guokai1
	2
	LI Haibo2
	WANG Mingyang1
	3
	LI Xiaofeng2

Cite this article:

ZHANG Guokai1,2,LI Haibo2, et al. Study on characteristics of failure strength and crack propagation of granite rocks containing a single fissure [J]. , 2019, 38(S1): 2760-2771.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1151 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2760

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