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Assessment of NATM tunnel lining thickness and its behind state utilizing GPR survey

GPR탐사를 통한 NATM터널(무근)라이닝의 두께 분포 및 배면상태 평가

  • Choo, Jin-Ho (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Yoo, Chang-Kyoon (Technical Support in Diagnosis Division, Korea Infrastructure Safety and Technology Cooperation) ;
  • Oh, Young-Chul (Technical Support in Diagnosis Division, Korea Infrastructure Safety and Technology Cooperation) ;
  • Lee, In-Mo (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 추진호 (고려대학교 건축사회환경공학부) ;
  • 유창균 (한국시설안전공단 기술진단지원팀) ;
  • 오영철 (한국시설안전공단 기술진단지원팀) ;
  • 이인모 (고려대학교 건축사회환경공학부)
  • Received : 2019.07.25
  • Accepted : 2019.08.21
  • Published : 2019.09.30

Abstract

In this study, lining thickness distribution and its behind state (particularly, its void state) were analyzed using the GPR survey data performed on three currently operating NATM tunnels. Results of GPR analysis showed that void areas were mostly detected between concrete lining and primary support, particularly, near the crown of the tunnels. The lining thickness in the left-hand side of the tunnel was different from that of the right-hand side by 8.6~253.5 mm when measured in transverse direction. It was also found that longitudinal cracks were prevailed in the area lining thickness was sharply changed. Longitudinal thickness distribution at the crown was also studied and tested by performing 3 goodness-of-fit tests in order to find the most suitable thickness distribution. Normal distribution (or similar distribution) fit most suitably to the measured data if the measured average thickness was larger than designed one; Gamma and/or Inverse Gauss distribution fit to the measured data reasonably well if the measured average thickness was less than the designed value of thickness. Since actual lining thickness can be a potential index when assessing the state and safety of the unreinforced NATM tunnel lining, measuring of the lining thickness with GPR survey might be needed rather than assuming the thickness is always constant and same with the designed value.

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