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《Rock and Soil Mechanics》 2001-04
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Numerical simulation research of acoustic emission characteristics under symmetrical and asymmetrical compressive loads

LIU Hong -yuan,TANG Chun-an,YANG Tian-hong,LI Lian-chong (Center for rock instability and seismicity research,North-east University,Shenyang110006,China)  
Failure process and acoustic emission(AE)characteristics accompanied by the failure process of rock specimens under symmetrical and asymmetrical compressive load conditions were simulated by Rock Failure Process Analysis(RFPA 2D )system,which was developed by the authors.The simulated results reflect macroscopic failure evolution process induced by microscopic fracture and the spatial and temporal distribution characteristics of acoustic emissions event hypocenter.Based on the simulated results,it was pointed out that the great difference between two loading scenarios is the occurrence of localized shear rupture plane and a more localized distribution of acoustic emissions event hypocenter.From the physical point of view,the asymmetrical tests represent a new approach in understanding the brittle failure of rock under controlled laboratory conditions with the path of the propagating rupture front known.From the point of AE research,a localization of AE event hypocenter can be better observed in the asymmetrical test than in the symmetrical test.
【Fund】: 国家杰出青年科学基金(编号:59525408);; 国家自然科学基金(编号49974009)项目资助。
【CateGory Index】: TU459
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