Acoustic Emission (AE) Setup
- One triaxial setup equipped for AE measurements on intact or fractured rock specimens
- Sleeve with radial and axial P&S- wave transmitter-receiver pairs and twelve one-component piezoceramic receivers for passive monitoring
- Hardware and software for acquisition and interpretation
Applications
- AE rate vs. stress and strain; for evaluation of AE rate vs. strain development and failure process and during re-mobilization of fractures during residual shear
- Event localizationin 3D space – time; comparison with fracture pattern from 3D re-constructed image based on CT scan of plug after test
- Source mechanism of fracture events; using moment tensor inversion to highlight tensile vs. shear fracturing
- Micro seismic; upscaling/evaluations of AE for field scale micro seismic monitoring applications
Figure: NGI's sleeve for acoustic emission (left), and CT scan of plug with shear fracture generated around a horizontal borehole (middle) and corresponding event localization (right)
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