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| INVESTIGATION ON ACOUSTIC EMISSION BEHAVIOR AND ITS TIME-SPACE EVOLUTION MECHANISM IN FAILURE PROCESS OF COAL-ROCK COMBINED BODY |
| ZUO Jianping1，2，PEI Jianliang3，LIU Jianfeng3，PENG Ruidong1，LI Yuechun2 |
(1. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Beijing 100083，China；
2. Institute of Rock Mechanics and Fractals，School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；3. College of Water Resources and Hydropower，Sichuan University，Chengdu，
Sichuan 610065，China) |
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Abstract Both of MTS 815 testing system and acoustic emission (AE) monitoring system are used to measure the AE activities of single rock，single coal and coal-rock combined body under uniaxial compression test. We focus on finding the discrepancies of failure mechanisms of the three；and then it can provide guidance for microseismic monitoring in the field. The experimental results indicate that with the increase of load，the cumulative AE numbers of single rock，single coal and coal-rock combined bodies are increasing. In addition，the AE numbers of unit volume of single coal or coal-rock combined body is about 1 order of magnitude more than those of single rock. It can be attributed to the low coal strength and its internal fractured structure. Through comparison of the AE numbers of different periods，we find the essential characteristics among the three kinds of samples. With the increase of load，the AE number in a time interval gradually increases in rock，decreases in coal，and increases initially and then decreases in coal-rock combined body. In the three kinds of samples，single rock and coal have the maximum and the minimum failure strength，respectively. However，the failure strength of coal-rock combined body lies in between the single rock and coal. For the coal-rock combined body，the AE number accounts for about 10%–30% in rock，and about 70%–90% in coal. In addition，the spatial distribution of AE activity is mainly affected by the coal initial internal micro structure and the primary micro cracks.
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Received: 14 February 2011
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2011, Vol. 30 
