Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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A Study on the Temperature Distribution of Rock Mass at KAERI Underground Research Tunnel: Verification on the Result of Borehole Heater Test

지하처분연구시설(KURT) 내 암반의 온도 분포에 관한 연구 : 시추공히터시험 결과의 검증

  • 윤찬훈 (한국원자력연구원 방사성폐기물 처분연구부) ;
  • 최영철 (한국원자력연구원 방사성폐기물 처분연구부) ;
  • 권상기 (인하대학교 에너지자원공학과) ;
  • 최희주 (한국원자력연구원 방사성폐기물 처분연구부)
  • Received : 2013.07.23
  • Accepted : 2013.08.20
  • Published : 2013.08.31
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Abstract

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.

본 연구에서는 시추공히터시험의 실측 결과를 FEM 해석코드인 ABAQUS ver 6.10을 이용하여 열 해석을 수행하였다. 현장시험 전 암석 코아에 대한 실내 실험을 통해 결정된 열, 역학적 암반물성과 실험구간 내 대기특성을 해석 초기조건으로 입력하였다. 현장시험과 열 해석의 결과를 비교했을 때, 히터로부터 0.9 m 이격된 C3 관측공의 온도는 상당히 유사한 패턴과 수치(약 $1.3^{\circ}C$ 차이)를 보였으나, A와 B 관측공의 현장시험 결과와는 최대 $15^{\circ}C{\sim}20^{\circ}C$가량의 큰 차이를 나타냈다. 이러한 결과의 이유를 찾고자 A1과 B1 관측공을 대상으로 over-coring을 실시하였다. 육안으로 시추된 코어를 확인한 결과, 센서의 위치, 개수는 문제가 없었지만, 관측공내 시멘트의 주입 상태가 불량하였다.

Keywords

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