Affiliation:
1. School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Abstract
In this paper, a rock dynamic and static triaxial mechanical test system is adopted to conduct triaxial compression failure acoustic emission test on coal rock with outburst-proneness. The purpose is to study the evolution law of the acoustic emission (AE) b value of coal rock under static and dynamic load of varying frequencies. The test results show that the dynamic load disturbance will accelerate the instability failure process of coal rock, that the average stress level/ultimate strain of coal rock decline/rises correspondingly with the increasing dynamic load frequency. Moreover, the overall AE b value after dynamic load disturbance is relatively low, and the higher the dynamic load frequency, the larger the decrease in the b value. In addition, as the dynamic load frequency increases, the AE ringing count and AE energy show a trend of first increasing and then decreasing, and they are negatively correlated with the evolution characteristics of the acoustic emission b value. Furthermore, the change rule of AE b value is closely related to the instability and failure process of coal rock. A second-stage of the overall b value of acoustic emission shows a “cliff jumping type” decrease dip angle or “fault cliff type” decrease dip angle indicates the imminent failure of coal rock, which can be used as an evaluation index for real-time monitoring of dynamic disasters of coal rock with outburst-proneness.
Funder
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,Geotechnical Engineering and Engineering Geology,Condensed Matter Physics,Civil and Structural Engineering
Reference58 articles.
1. Novel idea and disruptive technologies for the exploration and research of deep earth;H. P. Xie;Advanced Engineering Sciences,2017
2. Experimental study on precursor characteristics of coal and gas outbursts based on acoustic emission energy analysis;J. P. Tang;Chinese Journal of Rock Mechanics and Engineering,2020
3. Microseismic Signal Spectra, Energy Characteristics, and Fractal Features Prior to Rock Burst: A Case Study from the Qianqiu Coal Mine, China
4. State of the art review on mechanism and prevention of coal bumps in China;Y. D. Jiang;Journal of China Coal Society,2014
5. Theoretical basis and key technology of prevention and control of coal-rock dynamic disasters in deep coal mining;Q. X. Qi;Journal of China Coal Society,2020
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献