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2024 Vol.26, Issue 3 Preview Page

Research Paper

Deformation of segment lining and behavior characteristics of inner steel lining under external loads

외부 하중에 따른 세그먼트 라이닝 변형과 보강용 내부 강재 라이닝의 거동 특성

Gyeong-Ju Yi1
,
Ki-Il Song2*
이 경주1
,
송 기일2*
1Ph.D. Student, Dept. of Civil Engineering, Inha University / Executive Managing Director, SQ Engineering
2Professor, Dept. of Civil Engineering, Inha University
1정회원, 인하대학교 토목공학과 박사과정 / 에스큐엔지니어링 전무
2정회원, 인하대학교 토목공학과 정교수
*Corresponding Author
31 May 2024. pp. 255-280
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Abstract

If there are concerns about the stability of segment lining due to section deficiency or large deformation in shield TBM tunnel, reinforcement can be done through ground grouting outside the tunnel or by using steel plate reinforcement, ring beam reinforcement, or inner double layer lining inside the tunnel. Traditional analyses of shield TBM tunnels have been conducted using a continuum method that does not consider the segmented nature of segment lining. This study investigates the reinforcement mechanism for double layer reinforced sections with internal steel linings. By improving the modeling of segment lining, this study applies Break-joint mode (BJM), which considers the segmented characteristics of segment lining, to analyze the deformation characteristics of double layer reinforced sections. The results indicate that the existing concrete segment lining functioned similarly to ground reinforcement around the tunnel, rather than distribution the load. In general, both the BJM model considering the segmentation of segment lining and the continuum rigid method were similar deformation shapes and stress distributions of the lining under load. However, in terms of deformation, when the load strength exceeded the threshold, the deformation patterns of the two models differed.

Keywords
Segment lining deformation
Break-joint mode
Stress distribution of segment lining
Convergence confinement method
Inner steel lining

쉴드TBM 터널에서 단면 부족이나 큰 변형이 세그먼트 라이닝의 안정성에 우려될 경우 터널 외부에 지반 그라우팅으로 보강하거나 터널 내부에 강판 보강, 링 빔 보강, Inner double layer lining으로 보강하는 경우가 있다. 또한, 기존의 쉴드TBM 터널의 해석은 세그먼트라이닝의 분절 특성을 고려하지 않는 연속체의 강성일체법으로 해석되어왔다. 본 연구는 내부 강재 라이닝으로 보강한 double layer 보강 단면에 대해 보강 메커니즘을 연구하였다. 본 연구는 세그먼트 라이닝에 대한 모델링을 개선하여 세그먼트 라이닝의 분절 특성을 고려한 분절체 모델링(BJM)을 적용하였고 이를 통해 세그먼트 라이닝의 변형 특성을 반영한 double layer 보강 단면을 해석하였다. 연구 결과 기존 콘크리트 세그먼트 라이닝은 하중을 일정부분 분담하는 역할이 아닌 터널 주변 지반을 보강한 것과 같은 역할을 하였다. 일반적으로, 세그먼트 라이닝의 분절을 고려한 BJM 모델과 분절을 고려하지 않는 강성일체법 모두 하중을 받은 라이닝의 변형 형상과 응력 분포가 유사하게 나타났다. 그러나 하중의 강도가 임계치를 넘는 경우 변형의 양상에 차이가 있으며 변형 특성을 보다 면밀히 검토할 수 있는 것으로 나타났다.

키워드
세그먼트 라이닝 변형
Break-joint mode
세그먼트 라이닝 응력 분포
내공변위제어법
내부 강재 라이닝
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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 : 26
  • No :3
  • Pages :255-280
  • Received Date : 2024-05-07
  • Revised Date : 2024-05-20
  • Accepted Date : 2024-05-21
  • DOI :https://doi.org/10.9711/KTAJ.2024.26.3.255
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