Acoustic emission characteristics of coal creep under step load

被引：0

作者：

Yang, Yongjie ^{[1
]}

Wang, Dechao ^{[1
,2
]}

Zhao, Nannan ^{[1
]}

Chen, Shaojie ^{[1
]}

机构：

[1] State Key Laboratory Cultivation Base of Mining Disaster Prevention and Control, Shandong University of Science and Technology

[2] Geotechnical and Structural Engineering Research Center, Shandong University

来源：

Yang, Y. (yyj.6125@163.com) | 1600年 / Editorial Board of Journal of Basic Science and卷 / 21期

关键词：

Acoustic emission; Coal; Creep; Damage evolution; Step load; Stress threshold;

D O I：

10.3969/j.issn.1005-0930.2013.01.017

中图分类号：

学科分类号：

摘要：

Experiments on acoustic emission (AE) characteristics of coal specimens under step load were carried out with MTS815 servo-controlled rock mechanical test system and AE21C detection system. Analysis of the experimental results showed that the step load had a creep stress threshold, creep deformation was not obvious until the loading exceeds the threshold. During the transient creep stage, AE activities gradually increased with the expending of the micro-pores and micro-fractures inside coal. During the steady creep stage, the creep deformation rate tended to be stabilized and the new fractures were less, and the AE events were less and their energy was low. During the accelerated creep stage, a large number of new fractures occur and quickly develop and cause the coal specimen to the macro fracture failure, the stored energy quickly released in a short period of time. Simultaneously, the AE events and their energy reached to the maximum value. The creep damage evolution process of coal can be well reflected by AE characteristics.

引用

页码：159 / 166

页数：7

共 14 条

[1] Wu L., Wang J., Preliminary exploration to rheology and micro-effect characteristics of coal, Chinese Journal of Rock Mechanics and Engineering, 15, 4, pp. 328-332, (1996)
[2] Yang Y., Wang D., Chen S., Et al., AE predicting study on compression and fracture of limestone sample based on discrete wavelet analysis, Journal of China Coal Society, 35, 2, pp. 213-217, (2010)
[3] Tang S., Yan Z., Zhu B., Et al., Acoustic emission characteristics of water-saturated coals in uniaxial compression experiment, Journal of China Coal Society, 35, 1, pp. 37-41, (2010)
[4] Chen J., Experimental study on triaxial compression deformation and acoustic emission property of rock, Journal of Wuhan University of Technology, 30, 2, pp. 94-96, (2008)
[5] Cao S., Liu Y., Zhang L., Et al., Experimental on acoustic emission of outburst-hazardous coal under uniaxial compression and creep, Journal of China Coal Society, 32, 12, pp. 1264-1268, (2007)
[6] Yang Y., Chen S., Han G., Experimental on acoustic emission during compression rupture procedure of coal sample, Journal of China Coal Society, 31, 5, pp. 562-565, (2006)
[7] Liu B., Li D., Zhao B., Damage evolution and acoustic emission character of coal-rock under unloading condition, Journal of Civil, Architectural & Environmental Engineering, 31, 2, pp. 57-61, (2009)
[8] Liu B., Huang J., Wang Z., Et al., Study on damage evolution and acoustic emission character of coal-rock under uniaxial compression, Chinese Journal of Rock Mechanics and Engineering, 28, SUPPL.1, pp. 3234-3238, (2009)
[9] Gaillet L., Benmedakhne S., Laksimi A., Nickel high temperature oxydation under creep loading using acoustic emission monitoring, Journal of Materials Science, 38, pp. 1479-1484, (2003)
[10] Zwerschke S.P., Wanner A., Arzt E., Evolution of fiber fragmentation in a short-fiber-reinforced metal-matrix model composite during tensile creep deformation-an acoustic emission study, Metallurgical and Materials Transactions, 5, pp. 1549-1557, (2002)

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