Abstract

In this study, the damage parameters of Mazars model for KURT (KAERI UndergroundResearch Tunnel) granite are measured form uniaxial compressive and Brazilian testsunder the simulated coupled condition of a deep geological disposal. The tests areconducted in three different temperatures (15°C, 45°C, and 75°C) and dry/saturatedconditions. Major model parameters such as maximum effective tensile strain (), At,Bt, Ac, and Bc differ from the typical reference values of concrete specimens. This islikely due to the difference in elastic modulus between rock and concrete. It is foundthat the saturation of specimens causes an increase in value of Bt and Bc while, the risein temperature increases  and Bt and decreases Bc. The damage model obtained fromthis study will be used as the primary input parameters in the development of coupledThermo-Hydro-Mechanical Damage numerical model in KAERI.