Variation regulation of the acoustic emission energy parameter during the failure process of granite under uniaxial compression

Chunlai Wang; Tiancai Bao; Hui Lu; Lu Liu; Zhijiang Lu; Weiqiang Li; Qiwei Yu

doi:10.3139/120.110776

Published by De Gruyter August 31, 2015

Variation regulation of the acoustic emission energy parameter during the failure process of granite under uniaxial compression

Variationsgesetz der Schallemissionsenergieparameter während des Versagens von Granit unter einachsiger Druckbeanspruchung

Chunlai Wang , Tiancai Bao , Hui Lu , Lu Liu , Zhijiang Lu , Weiqiang Li and Qiwei Yu

From the journal Materials Testing

https://doi.org/10.3139/120.110776

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Abstract

The AE energy characteristics of granite specimens were tested experimentally under uniaxial compression to investigate the variation regulation of acoustic emission (AE) energy during the granite failure process. The results show that the AE energy accompanies rock deformation and failure during the entire loading process. With stress increase, AE energy of granite specimens is in dynamic variation. There is a fine corresponding relationship between AE energy and stress. Under low stress levels, AE energy is relative low and remains stable. As stress increases, in the plastic deformation stage, AE energy rapidly increases and remains at a high level indicating intense energy which is released before rock failure. This phenomenon could be considered as the precursor for rock failure. Moreover, the corresponding time point where the AE energy release rate reaches the maximum is determined as the critical point for predicting rock failure. Then AE energy sharply decreases in the failure stage and rock instability occurs.

Kurzfassung

Um das Variationsgesetz der Schallemissionsenergie während des Versagens von Granit zu untersuchen, wurden experimentelle Untersuchungen zu den Charakteristika der Schallemissionsenergie von Granitproben unter einachsiger Druckbeanspruchung durchgeführt. Die Ergebnisse zeigen, dass die Schallemissionsenergie die Gesteinsverformung und das Versagen während des gesamten Belastungsprozesses begleitet. Wenn die Spannung zunimmt, ist die Schallemissionsenergie unter dynamischer Variation. Es besteht eine Abhängigkeit zwischen der Schallemissionsenergie und der Spannung. Bei niedrigen Spannungsniveaus ist die Schallemissionsenergie klein und bleibt stabil. Wenn die Spannung zunimmt, steigt die Schallemissionsernergie im Bereich der plastischen Verformung rapide an und verbleibt auf hohem Niveau, was darauf hindeutet, dass seine intensive Energie freigesetzt wird, bevor das Gestein versagt. Dieses Phänomen kann als Vorankündigung für das Gesteinsversagen gedeutet werden. Darüber hinaus wurde der entsprechende Zeitpunkt, an dem die Freisetzungsrate der Schallemissionsernergie den maximalen Wert erreicht, als kritischer Punkt zur Vorhersage des Gesteinsversagens ermittelt. Danach nimmt die Schallemissionsenergie im Versagensstadium rapide ab und es tritt Instabilität des Gesteins auf.

§Correspondence Address, Wang Chunlai, Faculty of Resources and Safety Engineering, China University of Mining & Technology Beijing, Ding 11, Xueyuan Road, Haidian District, Beijing, P. R. China, P.C. 100083. E-mail: tswcl@126.com

Chunlai Wang, born in 1976, works as Professor in the Faculty of Resources and Safety Engineering, China University of Mining & Technology Beijing, China. The author has studied control of mine dynamic disasters and early warning technology for many years. Up tonow, he has published over 50 academic papers and holds 5 invention patents in China.

Tiancai Bao, born in 1991, is a postgraduate at China University of Mining & Technology Beijing, China. He obtained his bachelor degree there in 2014. His research interests mainly focus on the control of mine dynamic disasters and acoustic emission testing. He has attended the general programs of the national natural science foundation of China.

Hui Lu, born in 1990, is a postgraduate at China University of Mining & Technology Beijing, China. He obtained his bachelor degree at Henan Polytechnic University, China in 2013. His research interests mainly focus on the development of nondestructive materials testing technology and acoustic emission testing. He has published several academic papers and holds 2 invention patents in China.

Lu Liu, born in 1991, is a postgraduate at China University of Mining & Technology Beijing, China. He obtained his bachelor degree at Taiyuan University of Technology, China in 2014. His research interests mainly focus on the stability control of surrounding rocks in underground mining and micro seismic monitoring technology.

Zhijiang Lu, born in 1989, is a postgraduate at China University of Mining & Technology Beijing, China. He obtained his bachelor degree at North China Institute of Science and Technology in 2013. His research interests mainly focus on the control of surrounding rocks and dynamic disasters in underground mining.

Weiqiang Li, born in 1992, is an undergraduate at China University of Mining & Technology Beijing, China. His research interests mainly focus on the control of surrounding rocks in underground mining and micro seismic monitoring technology. He has attended the national students’ innovation and entrepreneurship training program in past years.

Qiwei Yu, born in 1991, is a postgraduate at China University of Mining & Technology Beijing, China. He obtained his bachelor degree there in 2014. His research interests mainly focus on the stability control of surrounding rocks in underground mining and mining technology. He has attended the national students’ innovation and entrepreneurship training program in the past years.

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Published Online: 2015-08-31

Published in Print: 2015-09-01

Variation regulation of the acoustic emission energy parameter during the failure process of granite under uniaxial compression

Abstract

Kurzfassung

References

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