Characteristics of acoustic emission signals in damp cracking coal rocks

被引：13

作者：

TANG S. ^{[1
]}

TONG M. ^{[1
]}

HU J. ^{[1
]}

HE X. ^{[1
]}

机构：

[1] School of Information and Electrical Engineering, China University of Mining and Technology, Xuzhou

来源：

Mining Science and Technology | 2010年 / 20卷 / 01期

关键词：

Acoustic Emission (AE); coal rocks cracking; de-noising; signal processing; wavelet packet analysis;

D O I：

10.1016/S1674-5264(09)60176-9

中图分类号：

学科分类号：

摘要：

A uniaxial load experiment on coal rocks at different stress rates was carried out, based on the characteristics of acoustic emission (AE) signals in cracking coal rocks, decomposition, de-noising and reconstruction for the AE signals through wavelet packet transform for solving the current problems created by the presence of noise in AE signals and the existing problems in AE signal processing. The results show that the various characteristics of AE signals in coal rocks cracking under different situations can be clearly reflected, after the AE signals are de-noised by the wavelet packet. Compared to dry coal rocks, the number of AE occurrences in damp coal rocks was significantly reduced, as well as the average amplitude. The number of AE occurrences in damp and dry coal rocks clearly increased with increases in the loading rate, but the largest amplitude of the AE signals in damp coal rocks has been reduced. There is no clear evidence of change in dry coal rocks. © 2010 China University of Mining and Technology.

引用

页码：143 / 147

页数：4

共 14 条

[1]

Sun Y.J., Yang G.Y., Zheng L., Distinguishing system study on resource of mine water inrush based on GIS, Coal Geology & Exploration, 35, 2, pp. 34-37, (2007)

[2]

Li J.P., Zhou C.B., Experimental research on acoustic emission characteristics of rock mass, Rock and Soil Mechanics, 25, 3, pp. 374-378, (2004)

[3]

Zhao E.L., Wang E.Y., Experimental study on acoustic emission characteristics of rock and soil in the failure process, Journal of Disaster Prevention and Mitigation Engineering, 26, 3, pp. 316-320, (2006)

[4]

Shen X., Wang X.W., In L., Experimental study of RAINBOW actuators made of PSZT, Journal of Intelligent Material Systems and Structures, 17, 8-9, pp. 691-694, (2006)

[5]

Lai X.P., Cai M.F., Couple analyzing the acoustic emission characters from hard composite rock fracture, Journal of University of Science and Technology Beijing, 11, 2, pp. 97-101, (2004)

[6]

Lu A.H., Mao X.B., Liu H.S., Physical simulation of rock burst induced by stress waves, Journal of China University of Mining & Technology, 18, 3, pp. 401-405, (2008)

[7]

Sun Y.J., Xu Z.M., Dong Q.H., Forecasting water disaster for a coal mine under the Xiaolangdi reservoir, Journal of China University of Mining & Technology, 18, 4, pp. 516-520, (2008)

[8]

Zhu Q.H., Feng M.M., Mao X.B., Numerical analysis of water inrush from working-face floor during mining, Journal of China University of Mining & Technology, 18, 2, pp. 159-163, (2008)

[9]

Masayasu O., Hiroshi W., Quantitative damage estimation of concrete by acoustic emission, Construction and Building Materials, 15, pp. 217-224, (2001)

[10]

Wang G.F., Analysis of energy distributions of rock acoustic emission signals using the wavelet packet method, Mining Engineering, 4, 5, pp. 11-14, (2006)

← 1 2 →