Research on Prediction of Coal Sample Deformation Based on Acoustic-Emission Sensitive Index

Man Wang, Jianguo Zhang, Bing Jia (), Weihang Du, Zhaofan Chen and Shuaitao Liu
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Man Wang: State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467099, China
Jianguo Zhang: State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467099, China
Bing Jia: State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467099, China
Weihang Du: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Zhaofan Chen: State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467099, China
Shuaitao Liu: State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan 467099, China

Sustainability, 2022, vol. 14, issue 22, 1-10

Abstract: Establishing the relationship between the deformation of coal samples and acoustic emission response is the basis for the deformation prediction of coal samples. Using a combination of laboratory tests and theoretical analysis, acoustic emission tests of the uniaxial loading process were conducted on coal samples in the study area and the test results were analyzed, focusing on the rule of variation of acoustic emission counts with loading time. Based on the analysis of stress, strain, time, and acoustic-emission parameters variation, the relationship between the deformation of coal samples and acoustic emission response was established and analyzed. The analysis results show that during the loading process, the acoustic emission counts show the characteristics of stage changes, which can be divided into three stages: the initial stage with sporadic acoustic emission events, the middle stage with a stable increase of acoustic emission events, and the final stage with the rapid increase of acoustic emission events. This stage division has good consistency with the deformation stages of coal samples. Moreover, the acoustic emission counts have obvious and easily identifiable characteristics of changes in the deformation process of coal samples. The acoustic emission count can be used as a sensitive indicator in this study area to predict the deformation of coal samples. It provides a reference for the application of acoustic-emission prediction technology in this study area, which is important to improve the accuracy of geohazard prediction.

Keywords: acoustic emission count; sensitive index; stage feature; deformation prediction (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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