Search | Korea Science

Kwon, S.;Lee, C.;Yoon, C.H.;Jeon, S.W.;Cho, W.J.
- Tunnel and Underground Space
- /
- v.21 no.3
- /
- pp.225-234
- /
- 2011
In this study, an in situ heater test for investigating the thermo-mechanical behavior related to heat flow was carried out. It was the first in situ heater test in Korea. For the test, an adequate design of heater, observation sensors, and data logging system was developed and installed with a consideration of the site condition and the test purposes. It was possible to observe that steep joints are overwhelmingly developed in the test area from a joint survey. The major rock and rock mass properties at the test site could be determined from the thermal and mechanical laboratory tests using the rock cores from the site. From the measured rock temperature distribution, it was possible to observe the influence of the rock joints and the heat flow through tunnel wall. When the heater temperature was maintained as $90^{\circ}C$, the rock temperature at 0.3 m from the heater hole was increased up to $40^{\circ}C$.
https://doi.org/10.7474/TUS.2011.21.3.225 인용 PDF KSCI

Yoon, Chan-Hoon;Choi, Young-Chul;Kwon, Sang-Ki;Choi, Heui-Joo
- Tunnel and Underground Space
- /
- v.23 no.4
- /
- pp.297-307
- /
- 2013
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 $1.3^{\circ}C$ difference). But the results of the A and B observation hole showed a significant difference around $15^{\circ}C{\sim}20^{\circ}C$. 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.
https://doi.org/10.7474/TUS.2013.23.4.297 인용 PDF KSCI