(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：To investigate the acoustic emission(AE) characteristics and laws of rock discontinuity under compression-shear stress，irregular serrated discontinuities with different asperity height were made of cement mortar and change laws of AE parameters and their mechanism of the discontinuities at different asperity height，shearing velocity and different normal stress are studied. Experimental results indicate that the ideal cumulative hits of discontinuity during shearing can be divided into three stages——quiet period，slow rise period and sharp growth period. It can be found that the peak energy rate increases while cumulative hits decrease with the increase of discontinuity asperity height when macroscopic shear failure occurs. With increase of shearing velocity，curves of energy rate and hit rate become higher volatility and peak energy rate，peak hit rate and cumulative energy tend to decrease. Change laws of AE parameters is not very obvious with the change of normal stress，but peak energy rate and cumulative energy tend to decrease while peak hit rate and cumulative hits increase with the increase of normal stress. Research results can provide guidance for applications of acoustic emission techniques into monitoring and prediction of the static or dynamic shear failure of in-situ rock discontinuities.
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2015, Vol. 34 
