复杂加卸载路径下闪长玢岩强度特征及声发射特性试验研究

doi:10.13722/j.cnki.jrme.2015.1171

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Abstract Loading and unloading rock mechanics tests were tested using brittle rock from a typical deep mine. Mechanics and fracture characteristics of brittle rock under complex stress path were analysed. The AE ring count evolution characteristic in rupture process was studies using acoustic emission equipment. Studies have shown that，mechanical properties and deformation characteristics of rock have a close relationship with the confining pressure and its failure mode gradually transited from brittle fracture to ductile failure. Unloading operation amounted to apply a reverse rally on specimen surface that usually caused the rapid growth of radial displacement which named expansion phenomenon. Damage degree of unloading was more severe than loading and a large number of vertical cracks appear on rock surface so that rock damage form was composite tensile and compressive damage and acoustic emission count rate when the rock damaging of unloading was far greater than loading. The rock internal AE ring count evolution process was divided into three phases in the unloading process including calm before the peak period，active period and gentle period after peak. There were critical value of stress，strain and AE ring count in every period that got by a large number of laboratory tests and field monitoring.

Key words： rock mechanics brittle rock triaxial loading unloading rupture characteristics acoustic emission

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	Articles by authors
	FU Jianxin1
	2
	SONG Weidong1
	2
	TAN Yuye1
	2

Cite this article:

FU Jianxin1,2,SONG Weidong1, et al. Experimental study of the characteristics of strength and AE of Diorite porphyrite under complex loading and unloading path[J]. , 2016, 35(S2): 3858-3867.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1171 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3858

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