Moment tensor analysis of the acoustic emission source in the rock damage process  

作　　者：YUHuaizhong ZHUQingyong YINXiangchu WANGYucang 

机构地区：[1]StateKeyLaboratoryofEarthquakeDynamics,InstituteofGeology,ChinaEarthquakeAdministration,Beijing100029,China [2]SchoolofMathematicsandComputationalScience,ZhongshanUniversity,Guangzhou510275,China [4]StateKeyLaboratoryofNonlinearMechanics,InstituteofMechanics,ChineseAcademyofSciences,Beijing100080,China／／CenterforAnalysisandPrediction,ChinaSeismologicalBureau,Beijing100036 [5]Quakes,DepartmentofEarthScience,UniversityofQueensland,Brishbane,Austrialia）

出　　处：《Progress in Natural Science:Materials International》2005年第7期609-613,共5页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant Nos. 10232050, 4014019 and 10102024) the Ministry of Science and Technology of China (Grant No. 2002CCA04500)the Computer Network Information Center of Chinese Academy of Sciences (Grant No. INF105-SCE-2-02)

摘　　要：To further investigate the mechanism of acoustic emission (AE) in the rock fracture experiment, moment tensor analysis was carried out. The AE sources characterized by crack sizes, orientations and fracture modes, are represented by a time-dependent moment tensor. Since the waveforms recorded by AE monitors correlate to the moment tensors, we prefer to select the P wave amplitude from the full-space Green's function of homogeneous and isotropic materials to determine the six independent components of the moment tensor. The moment tensor analysis was used to investigate the AE sources recorded in the experiment, and three types of micro-cracks were found, which are tensile mode, shear mode and mixture of the tensile and shear mode. In addition, the motion of micro-cracks was decided by eigenvectors of moment tensor. Results indicate that the moment tensor analysis may be used as a measurement to reflect the damage evolution of rock specimen.To further investigate the mechanism of acoustic emission (AE) in the rockfracture experiment, moment tensor analysis was carried out. The AE sources characterized by cracksizes, orientations and fracture modes, are represented by a time-dependent moment tensor. Since thewaveforms recorded by AE monitors correlate to the moment tensors, we prefer to select the P waveamplitude from the full-space Green's function of homogeneous and isotropic materials to determinethe six independent components ofthe moment tensor. The moment tensor analysis was used toinvestigate the AE sources recorded in the experiment, and three types of micro-cracks were found,which are tensile mode, shear mode and mixture of the tensile and shear mode. In addition, themotion of micro-cracks was decided by eigenvectors of moment tensor. Results indicate that themoment tensor analysis may be used as a measurement to reflect the damage evolution of rockspecimen.

关 键 词：moment tensor acoustic emission rock fracture 

分 类 号：O42[理学—声学]