裂隙砂岩裂纹扩展声发射响应及速率效应研究

doi:10.13722/j.cnki.jrme.2017.1672

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Abstract The geodynamic disaster is the process of development and nucleation of fractured structures in rock mass. With the aid of acoustic emission(AE) monitoring，the failure process can be monitored to realize the accurate early-warning of the disasters. In this paper，the AE response varying with time including the AE counts，multifractal and frequency spectrum of fractured sandstone were measured in the entire loading process under different loading rates. The AE behaviors at the key points of crack propagation and the loading rate effects were studied using 3D locating according to the AE events. The loading rate was found to have significant effects on the propagation of macro-cracks and AE behaviors of fractured sandstone. The peak AE counts，the multifractal spectrum width ，and the amplitude of dominant frequency increase gradually but the dominant frequency and multifractal decrease gradually with the increasing of loading rates. The dynamic and nonlinear characteristics of rock failure process become more obvious，and the failure modes change from shear failure to tensile failure. In the whole loading process，the AE counts，the multifractal spectrum width and the low frequency component proportion increase gradually，while the multifractal parameter decreases gradually with the increasing of axial stress. The AE multifractal and spectral parameters show fluctuation characteristics，and the AE counts show“pulse + calm”feature for multiple times when the sandstone specimen enters into the meta-instable stage. These time-varying trends of AE can be used to early-warn the dynamic disaster. The initiation，propagation，coalescence and nucleation of macro-cracks are the processes of rupture of locked bodies inside rock. An event of fracturing of locked body corresponds to a drop of stress，a large value of AE count，and an extremum value of the multifractal and spectral parameters. The loading rate effects and the AE response precursor behaviors of repeated suddenly increasing then quiet at the meta-instable stage can all be explained reasonably with the established theory of rupture nucleation of multiple locked bodies.

Key words： rock mechanics fractured sandstone AE time-space response frequency-spectra evolution time-varying multifractal loading rate effect multiple locked bodies

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	Articles by authors
	WANG Xiaoran1
	2
	3
	WANG Enyuan1
	2
	LIU Xiaofei1
	2
	LI Xuelong4
	WANG Hao1
	2
	LI Dexing1
	2

Cite this article:

WANG Xiaoran1,2,3, et al. Macro-crack propagation process and corresponding AE behaviors of fractured sandstone under different loading rates#br#[J]. , 2018, 37(6): 1446-1458.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1672 OR http://www.rockmech.org/EN/Y2018/V37/I6/1446

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