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Suggestion for the improvement of the field measurements on the shotcrete lining

터널 숏크리트 계측의 개선방안

Hak-Joon* Kim1*
,
Si-Hyun Park2
,
Gyu-Jin Bae3
김 학준*1*
,
박 시현2
,
배 규진3
1대전대학교 지반설계정보공학과 교수
2한국시설안전공단 일반도로팀 지반파트장
3한국건설기술연구원 부원장
*교신저자. *Corresponding Author. 
31 March 2010. pp. 177-192
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Abstract

The field measurements on the shotcrete lining are usually performed during the tunnel construction. However, the credibility of the measurements is not certain because of the non-stress related strains occurring in the shotcrete, the uncertainty of the deformation modulus of the shotcrete, and the intrinsic difficulties involved in the strain measurements in the shotcrete. The problem related to the field measurements on the shotcrete is investigated using the review of the previous studies and the field measurement performed for this study. A method for the correction of stress measurements at the shotcrete lining, considering the non-stress related strains, is suggested using the literature review and the actual measurements obtained from the non-stress shotcretes. The deformation modulus used for the calculation of the stress acting on the shotcrete is also suggested.

Keywords
Field measurements
shotcrete lining
non-stress shotcretes
deformation modulus of the shotcrete

터널현장에서는 터널의 안정성을 평가하기 위하여 숏크리트 계측이 활발히 수행되고 있다. 그러나 숏크리트 응력 측정은 지반하중과 관계없이 발생되는 변형률 및 숏크리트 변형계수의 불확실성, 숏크리트 응력 측정 자체의 어려움 등에 의하여 측정 결과의 신뢰성을 기대하기 어렵다. 본 연구에서는 국내외의 숏크리트 계측의 현황 분석 및 현장 계측 결과를 통하여 기존 숏크리트 계측의 문제점을 분석하였다. 문헌조사 및 터널 현장에서의 무응력 숏크리트 계측 결과를 이용하여 무응력 상태에서 발생하는 숏크리트 응력의 보정 방안을 제시하였다. 또한 측정된 변형률을 응력으로 환산할 경우에 적용할 숏크리트 변형계수를 제시하였다.

키워드
현장 계측
숏크리트 라이닝
무응력 숏크리트
숏크리트 변형계수
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 12
  • No :2
  • Pages :177-192
  • Received Date : 2010-02-17
  • Revised Date : 2010-03-03
  • Accepted Date : 2010-03-10
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