Acoustic Emission Behaviors in Rock Failure Process
Kenji AOKI, Yoshitada MITO, Takayuki MORI and Toshio MAEJIMA
Abstract:Underground excavation causes crack initiation and propagation, and Excavation Disturbed Zone (EDZ) could be formed around the cavern. Especially in highly stressed rock at great depth (e.g. high-level waste repository case), the formation of EDZ is strongly influenced by stress change in rock mass. Therefore, it is very important to monitor EDZ with stress change. For this purpose, AE measurement would be a suitable in both of scientific and practical point of views, and this will allows us to perform the rational observational design and construction. In order to realize this system, the relationship between AE, stress change, and fracturing is examined through the triaxial test and DEM analysis. Key Words:Acoustic emission (AE), Stress change, Rock failure, Tri-axial compression test, Distinct element method (DEM)