Moment tensor analysis of the acoustic emission source in the rock damage process
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.
作 者： Yu Huaizhong ZHU Qingyong Yin Xiangchu WANG Yucang 作者单位： Yu Huaizhong(State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080,China)ZHU Qingyong(School of Mathematics and Computational Science, Zhongshan University, Guangzhou 510275, China)
Yin Xiangchu(State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China;Center for Analysis and Prediction, China Seismological Bureau, Beijing 100036, China)
WANG Yucang(Quakes, Department of Earth Science, University of Queensland,Brishbane, Austrialia)
刊 名： 自然科学进展（英文版） SCI 英文刊名： PROGRESS IN NATURAL SCIENCE 年，卷(期)： 2005 15(7) 分类号： P5 关键词： moment tensor acoustic emission rock fracture