Abstract
An experimental tunnel was excavated at the 420-m depth at Atomic Energy of Canada Limited's (AECL) Underground Research Laboratory (URL) to investigate rock mass response to excavation-induced stress changes. The results show how the development of excavation-induced damage can be monitored and characterized remotely and non-destructively by examining acoustic emission/microseismicity (AE/MS). Geological mapping, conventional instrumentation and video camera monitoring were used to validate the seismic interpretation. In addition, we describe an AE/MS laboratory test designed to study thermally-induced damage from emplacement of a simulated nuclear waste container within the rock.
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