Characterization of Discontinuities in the Stripa Granite
An important problem in the storage of radioactive waste in fractured crystalline rock is the characterization of natural fractures for both thermomechanical and hydrologic purposes. From a thermomechanical standpoint fractures can introduce nonlinear behavior in the rock mass response to heating. Hydrologically, fractures represent the principal flow paths for radionuclide transport away from a repository. In the Swedish-American Radioactive Waste Storage Program at Stripa, Sweden, the fracture system is being characterized over either a local or large scale according to the needs of the experiment (1). The large scale studies are hydrologically oriented (2), whereas this paper deals with local fracturing around one of the underground heater tests at Stripa. The experiment, termed the “time-scaled” test, is located in a cavern 335 m below surface in massive granitic rock. While the site geology and experiment are described elsewhere (3), the purpose here is to present observational fracture data that can serve as input for thermomechanical interpretation of the test.
KeywordsRock Mass Trace Length Major Principal Stress Radionuclide Transport Experiment Drift
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