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  • Seismic validation of 3-d thermo-mechanical models for the prediction of the rock damage around radioactive waste packages in geological repositories SAFETI, Final report
FP5

Seismic validation of 3-d thermo-mechanical models for the prediction of the rock damage around radioactive waste packages in geological repositories SAFETI, Final report

Project ID: FIKW-CT-2001-00200
Funded under: FP5-EAECTP C

Abstract

Until now, computational limitations have meant that it was not practical to produce detailed three-dimensional (3D) field-scale experiments using discrete element modelling codes. The SAFETI project has produced a state of the art code (AC/DC) and visualization package (ACDCvis) that allows models of field-scale experiments in brittle materials (such as rock or concrete) to be performed. The code makes use of parallel computing technology, and has been successfully tested on 40 nodes of the Networked Earth Science Super Computer (NESSC) at Liverpool University, and a smaller computer cluster in France.
The models can contain excavations and an insitu 3D stress field can be applied. Microcracking is interpreted at the regions in the model where bond breakages occur between the model particles. The microcracks can be viewed and analyzed in terms of their location, orientation, and basic failure mechanism (shear or tensile). Further algorithms have been developed for spatially and temporally interpreting the microcracks in terms of acoustic emission/ microseismic (AE/MS) parameters including magnitude and the moment tensor source mechanism. Methods for measuring the static and dynamic stiffness tensor at specific locations within a 3D AC/DC model have been developed, which allows the damage and anisotropy to be quantified. Algorithms have been produced for predicting time dependent behaviour in the AC/DC model, calibrated to laboratory measurements. Methods have also been developed for interpreting and visualizing (using 3FLO) the hydraulic fracture network, and calculating the corresponding hydraulic parameters.

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