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(사)한국터널지하공간학회

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Vol.21 No.4
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Evaluation of mechanical properties of KURT granite under simulated coupled condition of a geological repository

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2019, v.21 no.4, pp.501-518
https://doi.org/10.9711/KTAJ.2019.21.4.501




& (2019). Evaluation of mechanical properties of KURT granite under simulated coupled condition of a geological repository. (사)한국터널지하공간학회, 21(4), 501-518, https://doi.org/10.9711/KTAJ.2019.21.4.501
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Abstract

The rock properties measured under in-situ geological condition can be used to increase the reliability in numerical simulations with regard to the long-term performance of a high-level waste repository. In this study, the change in mechanical properties of KURT (Korea atomic energy research institute Underground Research Tunnel) granite was evaluated under the simulated THM (Thermo-Hydro-Mechanical) coupled condition due to a deep geological formation in the disposal repository. The rock properties such as uniaxial compression strength, indirect tensile strength, elastic modulus and Poisson’s ratio were measured under the coupled test conditions (M, HM, TM, THM). It was found that the mechanical properties of KURT granite is more susceptible to the change in saturation rather than temperature within the test condition of this study. The changes in uniaxial compression strength and indirect tensile strength from the rock samples of dried or saturated conditions showed the maximum relative error of about 20% and 13% respectively under the constant temperature condition. Therefore, it is necessary to use the material properties of rock measured under the coupled THM condition as input parameters for the numerical simulation of long-term performance assessment of a disposal repository

keywords
고준위 방사성폐기물장, THM 복합 환경, KURT 화강암, 암석의 역학적 물성 변화, High-level radioactive waste disposal repository, THM coupled condition, KURT granite, Change of mechanical rock property

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