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Advances in Materials Science and Engineering
Volume 2017, Article ID 7857590, 11 pages
https://doi.org/10.1155/2017/7857590
Research Article

Resistivity and AE Response Characteristics in the Failure Process of CGB under Uniaxial Loading

1Institute of Mining Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
2Shanxi Province Research Center of Green Mining Engineering Technology, Taiyuan 030024, China
3College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China

Correspondence should be addressed to Guorui Feng; moc.361@iurougf

Received 20 December 2016; Accepted 29 March 2017; Published 10 April 2017

Academic Editor: Wei Zhou

Copyright © 2017 Tingye Qi and Guorui Feng. 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

To understand the characteristics of the acoustic emission (AE) and electrical resistivity of cemented coal gangue backfill (CGB) under uniaxial compression, the variations in these characteristics at 1 day, 3 days, and 7 days are analyzed by means of a stress-strain-resistivity-AE test, and the microperformances are investigated. The research results indicate that the AE can reflect the initiation and propagation of cracks and later explain the variation of the resistivity of the specimens under the uniaxial loading. The cumulative energy curve of AE is approximately two straight lines corresponding to the peak stress, and the difference in the linear slope gradually decreased with the increasing curing time due to the lower pore solution content and the compact pore structure. The relationships between the stress and resistivity and the loading condition before and after the peak stress at different curing times were established. Therefore, it is of great significance to predict the stability of the filling body by monitoring the AE and resistivity variations of the filling body. In addition, it is possible to calculate the roof stress using the relation equation between the resistivity and stress.