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

Evaluation of Mazars damage model of KURT granite under simulated coupled environment of geological disposal