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| Temporospatial Evolution Rules of Acoustic Emission Caused bu the Failure Process of Gas-saturated Coal |
| LIU Xingguang, GAO Feng, ZHANG Zhizheng, XING Yan, LI Xiru |
| State Key Laboratory for Geomechanics and Deep Underground Engineering; School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China |
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Abstract: To study the temporospatial evolution rules of Acoustic Emission (AE) caused by the failure process of gas-saturated coal, a series of triaxial compression AE tests were carried out by using MTS815 rock mechanics test system and gas seepage test system on raw coal samples with the different gas pressures. The experimental results indicate that the cumulative number of AE locating points gradually increases with load increasing, and the AE locating points mainly distribute in the vicinal area of main crack surface. With load increasing, the AE counts in unit load interval experience initial quiet period, low-level stabilization period in the medium-term, rapid development period before the peak, and high-level stabilization period in the post peak; it is similar to the variation of the cumulative AE counts of coal samples. The increase of gas pressure enhances the AE activity of coal samples before the initial damage, reduces the initial damage stress, and promotes the damage development of coal samples.
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Received: 04 January 2013
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2013, Vol. 31 
