动载扰动后花岗岩物理力学特性研究

doi:10.13722/j.cnki.jrme.2018.0068

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Abstract Most of the rock masses after dynamic disturbance return to the original state of stress or have the stress redistributed within a certain time period. One dimensional coupled dynamic and static loading tests were carried out under a new type of static and dynamic-static loading combinations to compare the characteristics of mechanical properties，permeability，wave velocity and acoustic emission of granite. The damage variable defined according to the ultrasonic velocity increases gradually with the increasing of the static axial pressure(ASP)，decreases first and then increases with the increasing of frequency. The maximum damage degree reaches 16%. The permeability and Poisson's ratio of samples are larger than the results of undisturbed samples，increase with the increasing of ASP，and increase at first and then decrease with the increasing of frequency. Both show high sensitivity to the high ASP. The strength and elastic modulus are less than the results of undisturbed specimens，increase with the increasing of ASP，and vary differently at the different levels of ASP with the increasing of frequency. Compared with the energy release of undisturbed rock samples，the specimen after the dynamic loading in the uniaxial compression process have no initial and latent stages of energy release and enter directly into the active stage of energy release with the duration prolonged and a lag phenomenon exists in the relative stress at the end and the energy release peak.

Key words： rock mechanics coupled static and dynamic loads macro-mechanics permeability wave velocity acoustic emission

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	Articles by authors
	YANG Fujian1
	2
	HU Dawei1
	2
	ZHOU Hui1
	2
	LU Jingjing1
	2
	ZHANG Fan3

Cite this article:

YANG Fujian1,2,HU Dawei1, et al. Physical and mechanical properties of granite after dynamic disturbance #br#[J]. , 2018, 37(6): 1459-1467.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0068 OR http://www.rockmech.org/EN/Y2018/V37/I6/1459

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