Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Performance Verification and Reliability Test of Tunnel Shotcrete Stressmeter

터널 숏크리트 응력계의 성능검증과 신뢰성 시험 연구

  • Kim, Yeong-Bae (Korea Construction Instrument Calibration Center Co., Ltd) ;
  • Park, Yeong-Bae (Dept.of Smart City Construction Convergence Engineerin, Daejin Univ.) ;
  • Lee, Seong-Won (Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering & Building Technology) ;
  • Lee, Kang-Il (Dept. of Smart Construction and Environmental Engineering, Daejin Univ.)
  • 김영배 (한국건설계측 검.교정센터(주)) ;
  • 박영배 ( 대진대 스마트시티 건설융합공학과 ) ;
  • 이성원 (한국건설기술연구원 지반연구본부 ) ;
  • 이강일 (대진대학교 스마트건설환경공학부 )
  • Received : 2024.07.18
  • Accepted : 2024.08.06
  • Published : 2024.08.31
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Abstract

Shotcrete lining is an important material for the stability of tunnels in NATM tunnels. However, stressmeters for stress measurements of shotcrete lining are installed in the field without performance verification because of a lack of research on methods, procedures, regulations, and reliability of measurement equipment. To solve this problem, all shotcrete stressmeters currently used in Korea were investigated. For each stressmeter, external inspection and structural and functional inspection were performed to identify defects and problems in devices. For this purpose, a shotcrete stressmeter performance test device capable of load loading in stages was developed and obtained KOLAS certification. Using the device, stressmeter performance tests were conducted. Structural problems of integrated- and cell-type shotcrete stressmeters were identified through concrete mold tests, and improvement plans and performance verification procedures were suggested. The results of this study are expected to contribute to the preparation of regulations for the performance verification of shotcrete stressmeters and the selection of measuring instruments in the field in the future.

NATM 터널에서 숏크리트의 응력측정은 계측기기의 신뢰도를 검증할 방법, 절차, 규정 등에 관한 연구 부족으로 인해 터널현장에서는 성능검증 없이 숏크리트 응력계가 설치 및 관리되고 있다. 본 연구에서는 일체형 및 셀타입 숏크리트 응력계의 외관검사, 구조·기능검사를 통해 불량 원인 및 문제점을 파악하고, 성능검사는 1차 시험으로 센서에 직접 하중을 재하하는 방식으로 하고, 셀타입 숏크리트 응력계는 KOLAS인증을 받은 성능검증장치를 국내 최초로 개발하여 성능검사를 실시하였다. 2차 시험으로 콘크리트 몰드시험을 통하여 일체형 및 셀타입 숏크리트 응력계의 구조적인 문제점을 파악하고 개선방안과 성능검증 절차를 제시하였다. 본 연구는 향후 숏크리트 응력계의 성능검증을 위한 규정 마련과 현장에서 계측기기를 선정하는 데 도움이 될 것으로 판단된다.

Keywords

Acknowledgement

이 연구는 국토교통부(국토교통과학기술진흥원) 2023년 건설기술 연구사업의 '도심 지하 교통 인프라 건설 및 운영 기술 고도화 연구'연구단의 지원으로 수행되었으며 이에 깊은 감사를 드립니다.

References

  1. Ace Instrument Home page (2024a; 2024b), http://aceco.co.kr/home/pro_kr/tunnel/3.pdf (Jun 20, 2024) 
  2. Dunnicliff, J. (1988), Geotechnical Instrumentation For Monitoring Field Performance, John Wiley & Sons, p.577. 
  3. ENERPAC catalog (2017), https://www.enerpac.co.kr/assets/files/updates/1.pdf, Model RC - 101, p.9. 
  4. Kim, H.J. and Park, C. (2008), "Investigation on the Credibility of the Vibrating Wire Strain Gauges used for the Tunnel Instrumentation", The Journal of Engineering Geology, Vol.18, No.2, pp.153-158 
  5. Kim, H.J., Park, S.H., and Bea, G.J. (2010), "Suggestion for the Improvement of the Field Measurements on the Shotcrete Lining", Journal of Korean Tunnelling and Underground Space Association, Vol.12, No.12, pp.177-192. 
  6. KOLAS Home page, https://www.knab.go.kr/usr/gud/abt/Introduce.do (Jun 20, 2024) 
  7. Ministry of Land, Infrastructure and Transport (2021), KCS 10 50 10 (Measurement), Chapter 2.1. 
  8. Ministry of Land, Infrastructure and Transport (2023a), KCS 27 50 10 (Tunnel Measurement), Chapter 3.1.5. 
  9. Ministry of Land, Infrastructure and Transport (2023b), KCS 27 50 10 (Tunnel Measurement), Chapter 3.1.5, Chapter 3.2.1. 
  10. Ministry of Land, Infrastructure and Transport (2023c), KCS 27 50 10 (Tunnel Measurement), Chapter 1.6, Chapter 3.2.6. 
  11. Public Notice of the Ministry of Public Administration and Security (2024a), No. 2024-31 Chapter 2, 4. 
  12. Public Notice of the Ministry of Public Administration and Security (2024b), No. 2024-31 Chapter 4.1. 
  13. Selig, E, T. (1964), "A Review of Stress and Strain Measurement in Soil", Proceedings of the Symposium on Soil Structure Interaction, University of Arizona, Tucson, AZ, pp.172-186. 
  14. Seoul Metropolitan Government Infrastructure Headquarters (2015), Improvement of Measurement Management of Seoul Subway, Seoul Metropolitan Government Urban Infrastructure Headquarters, Chapter 2.