An in situ borehole heater test was carried out in an underground research tunnel, which is for the validation of high-level radioactive waste disposal system suggested in Korea. For the test at a shallow depth in granite, the thermal and mechanical properties of rock were measured at different conditions. During the test, the heater temperature was increased to 90°C to simulate the thermo-mechanical behavior of crystalline rock under normal underground repository conditions. For simulating an abnormal over heating condition, the heater temperature was increased to 115°C at the end of the test. The air, wall and rock temperatures were measured over a period of several years. The peak temperatures at the observation holes located at 0.3m and 0.6m from the heater hole were approximately 50°C and 37°C, respectively. From the temperature measurements, it was possible to observe thee influence of rock joints and the influence of heat convection through the tunnel wall.
Investigation of the Thermal Behavior of Crystalline Rock Mass Using an In Situ Borehole Heater Test
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Kwon, S., Lee, C.S, and W.J. Cho. "Investigation of the Thermal Behavior of Crystalline Rock Mass Using an In Situ Borehole Heater Test." Paper presented at the ISRM Regional Symposium - 7th Asian Rock Mechanics Symposium, Seoul, Korea, October 2012.
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