Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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A study on the methods of identifying and verifying the causes of defects on rock bolt stressmeter and rod extensometer

터널계측용 록볼트축력계와 지중변위계의 불량원인 파악과 검증방법에 대한 연구

  • Kim, Yeong-Bae (Civil and Environmental Engineering, Daejin University, President of Mirae E&C Co., Ltd.) ;
  • Noh, Won-Seok (Mirae E&C Co., Ltd.) ;
  • Lee, Seong-Won (Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering & Building Technology) ;
  • Jeon, Hunmin (Civil and Environmental Engineering, Daejin University) ;
  • Lee, Kang-Il (Smart Construction and Environmental Engineering, Daejin University)
  • 김영배 (대진대학교 토목환경공학과, 미래이엔씨(주)) ;
  • 노원석 (미래이엔씨(주), 기술연구소) ;
  • 이성원 (한국건설기술연구원 지반연구본부) ;
  • 전훈민 (대진대학교 토목환경공학과) ;
  • 이강일 (대진대학교 스마트건설환경공학부)
  • Received : 2022.08.02
  • Accepted : 2022.09.14
  • Published : 2022.09.30
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Abstract

Instrumentations are essential in NATM tunnels, however measuring instruments are installed and applied without performance verification procedures due to insufficient research on methods, procedures, regulations, etc. to verify the reliability of the measuring instruments. In this study, domestic and foreign regulations relating to the verification and calibration of instruments were investigated and necessities for accreditation standards were proposed. In order to identify the causes of the defects, an external inspection was performed on rock bolt stressmeter and rod extensometer, which are measuring instruments with relatively complex structures. For verifying the performance of these instruments, verification devices were developed that can load step-by-step and the causes of defects were identified in measuring instruments of nine domestic manufacturers. Through the performance test, a number of measuring instruments were found to be defective. It was important to test the performance of the instruments in the state of a finished product and accordingly performance inspection methods and procedures were proposed. The results of this study are expected to help preparing related regulations for verifying instrument performance and selecting instruments in the field.

NATM 터널에서 계측은 필수 불가결한 요소이나 계측기의 신뢰도를 검증할 방법, 절차, 규정 등에 대한 연구가 부족함으로 인해 터널에서 계측기가 성능검증 절차 없이 설치 및 적용되고 있다. 본 연구에서는 국내외 계측 검·교정 관련 규정을 조사하고 공인 인정기준의 필요성을 제시하였다. 또한 터널계측기 중 록볼트 축력계와 지중변위계를 대상으로 계측기의 불량원인을 외관검사로 파악하였으며 성능검사를 위해 단계별 하중 재하가 가능한 검증 장치를 개발하여 국내 9개 계측제조업체의 정밀계측기 불량원인을 파악하였다. 개별센서 위주의 성능테스트도 중요하나 완제품 상태에서 검증 절차를 통과해야 함이 필수적이므로 이에 따른 성능검사 방법과 절차를 제시하였다. 본 연구를 통하여 향후 계측기 성능검증을 위한 관련 규정 마련과 현장에서 계측기를 선정하는 데 도움이 될 것으로 판단된다.

Keywords

Acknowledgement

이 연구는 국토교통부(국토교통과학기술진흥원) 2020년 건설기술연구사업의 '도심 지하 교통 인프라 건설 및 운영 기술 고도화 연구' 연구단의 지원으로 수행되었으며 이에 깊은 감사를 드립니다.

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