| Popis: |
Constraining the volumetric extent of excavation damage zones (EDZ) around engineered structures has benefitted from the application of remote, scaled seismic studies that passively monitor the medium using microseismic (MS) and acoustic emissions (AE) techniques combined with active ultrasonic surveys. By mapping AE/MS locations, fracturing and rock deformation can be correlated with the different operations in a working repository, e.g. gallery excavations, pressurization of containment holes and thermal stresses from the waste. These technologies provide a unique means of monitoring in real time the evolution of the EDZ and rock volumes surrounding a disposal facility and particularly the potential for creation of paths for fluid communication between the facility and its environment. This paper present presents a series of case studies where these methodologies have been applied for the imaging of damage development and containment capability of repositories excavated both in crystalline and plastic rocks. |
