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2025 Vol.27, Issue 3 Preview Page

Research Paper

Analysis of tunnel subgrade uplift behavior based on ground strength degradation model considering invert installation

지반 강도저하 모델을 이용한 인버트 유무에 따른 터널 노반 융기 거동 분석

Jungkuk Kim1
,
Heesu Kim2
,
Sangyun Kim3
,
Byounghun Kim4
,
Hoki Ban5*
김 정국1
,
김 희수2
,
김 상윤3
,
김 병훈4
,
반 호기5*
1Manager, Daewoo Engineering & Construction Co., Ltd.
2Post-Doctoral Researcher, Dept. of Civil Engineering, Kangwon National University
3Ph.D. Student, Dept. of Civil Engineering, Kangwon National University
4Master Student, Dept. of Civil Engineering, Kangwon National University
5Associate Professor, Dept. of Civil Engineering, Kangwon National University
1정회원, 대우건설 책임
2정회원, 강원대학교 건설융합학부 토목공학전공 박사후연구원
3비회원, 강원대학교 건설융합학부 토목공학전공 박사과정
4비회원, 강원대학교 건설융합학부 토목공학전공 석사과정
5정회원, 강원대학교 건설융합학부 토목공학전공 부교수
*Corresponding Author
31 May 2025. pp. 245-255
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Abstract

Tunnels are one of key elements in modern infrastructures, playing a crucial role in enhancing the efficiency of transportation and logistics systems. However, As the operation increases, ground degradation can occur, leading to uplift and horizontal displacement of the tunnel bottom, which can compromise structural stability. As the ground strength deteriorates over time, the deformation of the tunnel subgrade accelerates, resulting in increased maintenance costs and potential structural damage. Therefore, it is essential to analyze the displacement of the tunnel subgrade due to ground degradation and establish measures to control it. In this study, strength degradation model for surrounding soil was applied to numerically evaluate the long-term deformation behavior of the tunnel and analyze the effect of invert installation on displacement control. The numerical analysis results indicate that as the ground degradation rate increases, both uplift and horizontal displacement increase significantly. When the ground degradation rate increased from 10 to 70%, vertical displacement increased by approximately 4.9 times, while horizontal displacement increased by approximately 5.3 times. Additionally, an analysis of the displacement reduction effect of invert installation showed that although displacement continued to increase with higher ground degradation rates, the installation of an invert resulted in a maximum reduction of 91.4% in vertical displacement and 89.6% in horizontal displacement. Therefore, the numerical analysis using the ground degradation model proposed in this study is expected to be useful for quantitatively predicting settlement uplift and displacement behavior in various tunnel environments.

Keywords
Ground degradation
Long-term behavior
Numerical analysis
Invert installation
Bottom uplift

터널은 현대 인프라의 핵심 요소로, 교통 및 물류 시스템의 효율성을 높이는 데 중요한 역할을 한다. 그러나 장기 운영 과정에서 지반 열화(ground degradation)가 진행되면 지반 강도가 저하된다. 이에 따라 터널 노반의 융기가 발생하여 구조적 안정성을 저하시킬 수 있다. 특히, 지반 강도 저하는 시간이 지남에 따라 터널 노반의 변형을 가속화시키며, 유지보수 비용 증가 및 구조적 손상의 위험을 초래할 수 있다. 따라서 지반 열화에 따른 터널 노반의 변형 거동을 정량적으로 분석하고, 변위 제어를 위한 방안을 마련하는 것이 필수적이다. 본 연구에서는 지반 강도 저하 모델을 적용하여 터널 노반의 장기 변형 거동을 수치해석적으로 평가하고, 인버트(invert) 설치가 변위 제어에 미치는 영향을 분석하였다. 이를 위해 터널 주변 지반 열화율을 10, 30, 50, 70%로 설정하고, 인버트 설치 유무에 따른 터널 노반의 수직 변위를 비교 분석하였다. 수치해석 결과, 지반 열화율이 증가할수록 노반 융기가 급격히 증가하는 경향을 보였으며, 지반 열화율이 10%에서 70%로 증가할 경우 수직 변위는 약 4.9배 증가하는 것으로 나타났다. 또한, 인버트 설치 여부에 따른 변위 저감 효과를 분석한 결과, 인버트 설치 시에도 지반 열화율 증가에 따른 변위 증가는 지속되었으나, 최대 91.4%의 변위 저감 효과가 확인되었다. 따라서 본 연구에서 적용한 지반 강도 저하 모델을 활용한 수치해석 분석은 다양한 터널 환경에서 노반 융기 및 변위 거동을 정량적으로 예측하는 데 활용될 수 있을 것으로 기대된다.

키워드
지반열화
장기거동
수치해석
인버트
노반융기
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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 :3
  • Pages :245-255
  • Received Date : 2025-05-02
  • Revised Date : 2025-05-23
  • Accepted Date : 2025-05-23
  • DOI :https://doi.org/10.9711/KTAJ.2025.27.3.245
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