北山花岗岩三轴压缩下声发射特征及损伤演化规律研究

doi:10.13722/j.cnki.jrme.2018.0634

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Abstract

anical test system and PCI–2 acoustic emission system. A damage evolution model of Beishan granite based on the cumulative ring counting rate of acoustic emission under triaxial compression was established. Its damage characteristics and damage evolution law were analyzed. The results of the show that：(1) The Beishan granite under the condition of conventional triaxial compression，both mechanical parameters and the acoustic emission parameters show obvious confining pressure effect. Properly increasing the initial confining pressure is an effective way to promote the rapid closure of pre-existing fissures and to prevent the formation and development of new fissures. (2) Through the analysis of the stress-time-acoustic emission parameter curve，it is found that different periods of sound emission ringing counting rate and the five stages of the accumulative number of energy have a good correspondence with the five stages of rock compression deformation. (3) The damage evolution process is divided into damage formation stage，damage stable growth stage，accelerated damage growth stage and damage stage. It can reasonably reflect the deformation and failure characteristics of Beishan granite under different confining pressure and different facture stages.

Key words： rock mechanics Beishan granite acoustic emission triaxial compression damage model damage evolution law

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	Articles by authors
	SUN Xue1
	LI Erbing1
	DUAN Jianli1
	PU Shikun1
	TAN Yuehu1
	HAN Yang2
	ZHAO Yuqiao1

Cite this article:

SUN Xue1,LI Erbing1,DUAN Jianli1, et al. Study on acoustic emission characteristics and damage evolution law of Beishan granite under triaxial compression[J]. , 2018, 37(S2): 4234-4244.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0634 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4234

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