体积应变率对北山花岗岩疲劳特性的影响

doi:10.13722/j.cnki.jrme.2017.1085

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Abstract Dynamic triaxial cyclic loading-unloading tests on Beishan granite were performed using the rock mechanical test system MTS815. The main objective is to investigate the influence of the volumetric strain ratio on the fatigue characteristics of the rock. For each test，the volumetric strain at the threshold of crack damage stress was identified in the static loading stage. The fatigue initiation and the volumetric strain ratio were subsequently determined by measuring the variation of the volumetric strain for each specimen. The mechanical parameters were further obtained during dynamic loading. Then，the development of fatigue and damage behaviors of the specimens were revealed under different volumetric strain ratios. The instantaneous strains and the maximum plastic strains at failure are found not sensitive to the volumetric strain ratio. With the increasing of loading-unloading cycles，the plastic volumetric deformation presents three characteristic stages. In the stage of uniform deformation rate，the plastic volumetric strain rate and the Young?s modulus decrease nonlinearly with the increase of volumetric strain ratio. The plastic volumetric strain and the Young?s modulus were used to define the damage variables，which describe reasonably the damage process of the tested rock. Moreover，in the steady stage of damage development，the damage velocity of the specimens increases with the increasing of volumetric strain ratio. Different volumetric strain ratios lead to the difference of initial damage for specimens before dynamic fatigue testing. Hence，the fatigue life decreases significantly with the increasing of volumetric strain ratio.

Key words： rock mechanics Beishan granite volumetric strain ratio cyclic loading fatigue damage

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	Articles by authors
	HUANG Zhengjun1
	2
	ZHAO Xingguang3
	LI Yuan1
	2
	CAI Meifeng1
	2

Cite this article:

HUANG Zhengjun1,2,ZHAO Xingguang3, et al. Influence of volumetric strain ratio on the fatigue characteristics of Beishan granite[J]. , 2018, 37(5): 1161-1168.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1085 OR http://www.rockmech.org/EN/Y2018/V37/I5/1161

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