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2025 Vol.27, Issue 1 Preview Page

Research Paper

The numerical analysis study on the necessity of backfill grouting for cast-in-place concrete lining

현장타설 콘크리트 라이닝 뒤채움 그라우팅 필요성 분석을 위한 수치해석 연구

Hong-Joo Lee1
,
Ki-Il Song2*
,
Young-Gyun Na3
,
Tack-Woo Lee4
,
Dong-Gun Lee5
이 홍주1
,
송 기일2*
,
나 영균3
,
이 택우4
,
이 동건5
1Master Student, Dept. of Civil Engineering, Inha University
2Professor, Dept. of Civil Engineering, Inha University
3Master Student, Dept. of Smart City Engineering, Inha University
4Research Fellow, Innovative Railway Research Institute, Korea National Railway
5Doctor Student, Dept. of Civil Engineering, Inha University
1비회원, 인하대학교 토목공학과 석사과정
2정회원, 인하대학교 사회인프라공학과 교수
3비회원, 인하대학교 스마트시티공학과 석사과정
4비회원, 국가철도공단 철도혁신연구원 실용화연구처 차장
5비회원, 인하대학교 토목공학과 박사과정
*Corresponding Author
31 January 2025. pp. 23-43
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Abstract

Voids behind tunnel linings are often cited as a cause of deformation in tunnels, leading to lining cracks and convergence. Design standards and specifications for lining construction, both domestically and internationally, have reported that voids behind the lining negatively impact tunnel stability. This study analyzes the behavior of tunnels and linings under various NATM (New Austrian Tunnelling Method) tunnel conditions considering the influence of such voids. To examine tunnel behavior, the models were developed considering different rock mass grades, cover depths, and groundwater conditions. For models with groundwater presence, coupled hydro-mechanical analyses were performed. To model the sequence of NATM tunnel construction, the process from primary support stabilization through lining installation and backfill grouting was simulated. After lining installation and backfill grouting, voids behind the lining were modeled, with variations in models based on the presence or absence of backfill grouting. For the constructed models, long-term behavior was assumed post-tunnel construction, with scenarios established for failure of primary support, and for both failure of primary support and pressure generated by plastic zone development. In each scenario, the behavior of the tunnel and lining was compared and analyzed based on the presence or absence of backfill grouting.

Keywords
NATM tunnel
Tunnel numerical analysis
Voids behind the lining
Backfill grouting

터널 라이닝 배면에 존재하는 공동은 터널 변상의 원인 중 하나로 거론되며, 라이닝 균열, 붕락, 터널 내공변위 증가 등의 변상을 유발할 수 있다. 국내외 라이닝 관련 설계기준 및 시방서에서도 라이닝 배면에 발생한 공동이 터널의 안정성에 부정적인 영향을 미치는 것으로 보고하였다. 본 연구에서는 다양한 NATM (New Austrian Tunnelling Method) 터널 조건에서 배면 공동에 따른 터널과 라이닝의 거동을 분석하였다. 다양한 터널 조건에서 거동을 분석하기 위해 암반등급, 토피고, 지하수의 유무를 달리한 터널 모델들을 구축하였다. 이때, 지하수가 존재하는 모델은 수리-역학 연계 해석을 수행하였다. NATM 터널 시공의 일련 과정을 모델링하기 위해 1차 지보재 평형 이후 공정인 라이닝 타설과 뒤채움 그라우팅 시공까지 모델링 하였다. 라이닝 타설과 뒤채움 그라우팅 시공 이후 배면의 공동을 모델링 하였고, 뒤채움 그라우팅 시공 여부를 달리한 모델을 구축하였다. 구축한 모델에 대해 터널이 시공된 후 장기 거동을 한 것으로 가정하여 1차 지보재 열화가 발생한 시나리오, 그리고 1차 지보재 열화와 소성압이 발생한 시나리오를 설정하였다. 각 시나리오에서 뒤채움 그라우팅 여부에 따른 터널과 라이닝의 거동을 비교 분석하였다.

키워드
NATM 터널
터널 수치해석
배면 공동
뒤채움 그라우팅
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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 : 27
  • No :1
  • Pages :23-43
  • Received Date : 2024-11-13
  • Revised Date : 2024-12-19
  • Accepted Date : 2024-12-19
  • DOI :https://doi.org/10.9711/KTAJ.2025.27.1.023
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