Simulations of thermo-hydro-mechanical behavior of the potential repository at Yucca Mountain are presented in this paper.Zones of altered rock were taken from thermo-mechanical simulations of Mack et al.~1 to identify regions where the fracture aperture either increased or decreased by a factor of two.Comparisons were made between mechanically altered and unaltered thermohydrologic simulations during approximately 700 years of heating.results showed that the altered and unaltered simulations produced similar trends in fracture flow,liquid saturations,and temperatures,although the reduced aperture in the vicinity of the repository caused results of the altered case to be slightly different then the unaltered results.
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