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| ACOUSTIC EMISSION CHARACTERISTICS OF MARBLE DURING FAILURE PROCESS UNDER DIFFERENT STRESS PATHS |
| ZHANG Liming1，2，WANG Zaiquan1，SHI Lei1，KONG Liang1 |
| (1. College of Science，Qingdao Technological University，Qingdao，Shandong 266033，China；2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China) |
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Abstract The acoustic emission parameter tests of marble are carried out under loading and unloading conditions. The results show that the acoustic emission(AE) characteristics change with stress paths. In triaxial loading test，the AE amplitude increases with the increase of confining pressure. The cumulative energy increases linearly before rock failure. The biggest ring count rate and energy count rate don?t appear at the peak stress，but in the residual stage. There exists a quiet period of AE before the peak stress and residual stress. Each sudden increase of ring count rate corresponds to a stress drop. In triaxial unloading test，the AE amplitudes are larger before rock failure than those after rock failure. The ring count rate and energy count rate increase quickly at first. The cumulative energy increases nonlinearly during unloading process. Rock failure process can be divided into three stages according to the increase speed of cumulative energy：elastic stage，elastoplastic stage，plastic stage. There exists a quiet period of AE before the large-scale AE appears. Compared with the triaxial loading test，the biggest ring count rate and cumulative release energy are higher，which indicates rock failure of unloading test is more violent.
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Received: 12 January 2012
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2012, Vol. 31 
