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In this study, the thermal analysis is carried out for a result of borehole heater test using ABAQUS ver 6.10 based on finite element analysis code. Thermal-mechanical rock properties as determined by laboratory tests before the in situ test and characteristics of the atmosphere at the test section are used as the initial condition. When comparing the results of the in situ test and thermal analysis, the temperature of C3 observation hole that is 0.9 m away from the heater showed very similar patterns and figures (about 1.3℃ difference). But the results of the A and B observation hole showed a significant difference around 15℃20℃. To find the reason for these results, the over-coring is carried out for the A1 and B1 observation holes. As a result of checking the excavated rock core with the naked eye, there is no problem on the number and position of the sensor as the test plan. However the state of cement injection in the observation hole is poor. Key words KURT, BHT, Thermal analysis, Over-Coring, Rock mass temperature       FEM  ABAQUS ver 6.10    .           ,         .       ,  0.9 m  C3       ( 1.3℃ ) , A B     15℃20℃     .     A1 B1   over-coring  .     ,  ,   ,       .  , ,  , ,

A Study on the Temperature Distribution of Rock Mass at KAERI Underground Research Tunnel: Verification on the Result of Borehole Heater Test