Back-Analysis of Rock Mass Strength at a Radioactive Waste Disposal Site Using Acoustic Emission Monitoring Data and 3D Numerical Modelling

In this study, a new method was examined that used acoustic emission (AE) monitoring data, in combination with a primary Boundary Element stress analysis, to back-calculate rock mass strength. The presented AE data came from the National Radioactive Waste Repository (NRWR) for low- and intermediate-...

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Bibliographic Details
Published in:Energies (Basel) 2023-06, Vol.16 (12), p.4686
Main Authors: Deák, Ferenc, Perras, Matthew A., Szűcs, István, Török, Ákos
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic emission testing
Compressive strength
Crack initiation
Crack propagation
Deformation
Emission analysis
Excavation
Geology
granite
hypocenter
Investigations
Laboratories
Low level radioactive wastes
Martin, C. Dianne
Modulus of deformation
Monitoring
Nuclear power plants
Numerical models
Objective function
Pollution monitoring
Radioactive pollution
radioactive waste
Radioactive waste disposal
Radioactive waste sites
Radioactive wastes
Rock masses
Rocks
spalling
Storage facilities
Stress analysis
Underground construction
Underground storage
Waste disposal
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Summary:In this study, a new method was examined that used acoustic emission (AE) monitoring data, in combination with a primary Boundary Element stress analysis, to back-calculate rock mass strength. The presented AE data came from the National Radioactive Waste Repository (NRWR) for low- and intermediate-level waste (LLW/ILW). AE monitoring is able to detect the pre-peak, peak, and post-peak stress changes in rock mass. The presented method used AE monitoring data to back-calculate parameters, such as uniaxial compressive strength and the rock mass deformation modulus. The AE initiation threshold was used to develop an objective function that considered the stress in the rock mass and the rock mass strength. The findings of this research propose that most AE events can be related to the crack initiation threshold, and in space, most of them are located at points away from the excavated walls. In the vicinity of the excavation damage zones around the cavities, the stress conditions beyond the crack damage boundary of the rock mass occur in many areas, leading to significant irreversible deformations. This novel method was demonstrated to aid in the prediction of rock mass strength and is a valuable, non-invasive method for improving the spatial prediction of rock mass parameters, which will lead to safer underground storage facilities.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16124686