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Shock and Vibration
Volume 2018, Article ID 6086583, 12 pages
https://doi.org/10.1155/2018/6086583
Research Article

Experimental Study on Acoustic Emission of Weakly Cemented Sandstone considering Bedding Angle

1School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China
2College of Mining, Guizhou University, Guiyang 550025, China

Correspondence should be addressed to Tianhong Yang; moc.621@gnohnait_gnay

Received 26 October 2017; Revised 13 February 2018; Accepted 19 March 2018; Published 27 June 2018

Academic Editor: Longjun Dong

Copyright © 2018 Hong Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Uniaxial compression experiments and acoustic emission (AE) tests were conducted on weakly consolidated sandstone samples with bedding angle of 0°, 45°, and 90° collected from Xiaojihan coal mine in Shaanxi Province, China; the acoustic emission (AE) characteristics of bedding sandstone were investigated, including the influencing mechanism of bedding angle on characteristics, spatial distribution, and value changes of AE activity. According to the research, AE ringing counting rate and energy rate are the highest and energy release is intense during the loading process when the bedding angle is 0°, and these values decrease and the energy release is gentle with rising of the angle. Based on spatial distribution, the number of AE events was the largest and cluster phenomenon occurs between the bedding plane when the bedding inclination was 0°, which decreased and sprouted along the plane of bedding plane at 45° and which was smaller and evenly distributed in the space at 90°. With the increase of bedding angle, the proportion of large-scale microcracks decreases and the variation range of microcracks narrows down. Therefore, under the same uniaxial compression conditions, the value increases by the increase of bedding angle. The research results offer reliable reference to carry out monitoring work on acoustic emission and microseism of mine with layer rock (rock mass).