Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Assessment of Frozen Soil Characterization Via Electrical Resistivity Survey

전기비저항 탐사를 활용한 동결 지반의 거동 평가

  • Jang, Byeong-Su (Dept. of Disaster Safety Engrg., Daejeon Univ.) ;
  • Kim, Young-Seok (Northern Infrastructure Specialized Team, Korea Institute of Civil Engrg. and Building Technology) ;
  • Kim, Se-Won (Dept. of Geotechnical Engrg. Research, Korea Institute of Civil Engrg. and Building Technology) ;
  • Choi, Hyun-Jun (Northern Infrastructure Specialized Team, Korea Institute of Civil Engrg. and Building Technology) ;
  • Yoon, Hyung-Koo (Dept. of Disaster Safety Engrg., Daejeon Univ.)
  • 장병수 (대전대학교 재난안전공학과) ;
  • 김영석 (한국건설기술연구원 북방인프라특화팀) ;
  • 김세원 (한국건설기술연구원 지반연구본부) ;
  • 최현준 (한국건설기술연구원 북방인프라특화팀) ;
  • 윤형구 (대전대학교 재난안전공학과)
  • Received : 2023.12.05
  • Accepted : 2023.12.11
  • Published : 2023.12.31
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Abstract

In this study, we evaluated the behavior of frozen soil using an electrical resistivity survey method-a nondestructive technique-and examined its characteristics through field experiments. Frozen soil was artificially prepared by injecting fluid to accelerate the freezing process, and naturally frozen soil was selected in a nearby area for comparison. A dynamic cone penetration test (DCPT) was performed to compare the reliability of the electrical resistivity survey, and time-domain reflectometry surveys were performed to assess the moisture content of the ground. Field experiments were conducted in February-when the atmosphere temperature was below freezing-and May-when the temperature was above freezing. This temperature-compensated method was used to determine reliability because the behavior of frozen soil depends on the underlying temperature. In the resistivity survey method, a section of high electrical resistivity was observed under freezing conditions due to the frozen water and converted into porosity. The converted porosity was compared with the porosity inferred from the DCPT, and the results showed that the measured electrical resistivity was valid.

해당 연구의 목적은 비파괴 탐사 기법의 일환인 전기비저항 탐사 방법을 활용하여 동결 지반의 거동을 평가하는 것으로, 현장 실험을 통해 그 특성을 살펴보았다. 현장 실험은 동결된 상태를 가속화하기 위하여 유체를 주입한 인위적인 동결 지반을 만들었으며, 결과를 비교하기 위하여 이와 근접한 지역에서 자연적으로 동결된 지반에도 실험을 진행하였다. 실험은 전기비저항 탐사 외에 측정 값의 신뢰성을 비교할 수 있도록 동적 콘 관입 실험(Dynamic Cone Penetration Test)를 추가적으로 활용하였으며, 지반의 함수비도 평가하기 위해 Time Domain Reflectometry (TDR) 탐사도 수행하였다. 현장 실험은 대기 온도가 영하인 2월과 영상 조건을 보이는 5월에 각각 진행하였다. 전기비저항 탐사로 측정된 결과는 온도에 의존하는 경향이 있어 각 측정 값들은 온도 보상을 수행한 후 결과를 비교하였다. 측정 결과 동결 조건에서는 지반이 고체 특성을 보여 고비저항 구간이 다소 나타났으며 이를 간극률로 환산하였다. 환산된 간극률은 DCPT 결과로 유추한 간극률과 비교하여 신뢰성을 검증하였으며, 동결토에서 측정한 결과가 타당한 값으로 나타났다.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부의 한국연구재단(NRF-2020R1A2C2012113)과 국토교통부 국토교통과학기술진흥원 'AI 기반 가스·오일 플랜트 운영·유지관리 핵심기술 개발(RS-2021-KA161932)' 사업의 지원으로 수행되었으며 이에 감사드립니다.

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