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| EXPERIMENTAL STUDY OF CHARACTERISTICS OF SEEPAGE AND ACOUSTIC EMISSION OF GAS-FILLED COAL UNDER DIFFERENT STRESS PATHS |
| YIN Guangzhi1，2，3，QIN Hu1，2，3，HUANG Gun1，2，3 |
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China；
2. College of Resources and Environmental Sciences，Chongqing University，Chongqing 400030，China；3. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，Chongqing 400030，China) |
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Abstract A series of tests on characteristics of acoustic emission(AE) and seepage have been performed on gas-filled coal under conditions of conventional triaxial path and unloading confining pressure path. The difference in characteristics of AE and seepage of coal during failure process under two paths is studied. The results show that characteristics of AE and seepage change with stress paths. In the two paths tests，stress，gas flow and AE signal of gas-filled coal have good correlations；and the curve of gas flow has the similar change rules. The suffering point of gas flow lags in conventional triaxial path，but also an obvious and direct correspondence exists between the suffering point of gas flow and starting point under the unloading confining pressure path. Compared with the conventional triaxial path，the cumulative damage is bigger under the unloading confining pressure path. The curve slope of AE cumulative ringing from unloading confining pressure starting point increases obviously，and experiences a sharp increase in failure point. In the two paths tests，AE amplitude curves have different variations；and AE amplitude curves of gas-filled coal show a bimodal state bounded by the starting point under unloading confining pressure path.
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Received: 16 January 2013
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2013, Vol. 32 
