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2020 Vol.22, Issue 5 Preview Page

Research Paper

A study on the effect of support structure of steel rib in partitioning excavation of tunnel

터널 상 ‧ 하반 분할 굴착 시 강지보재 지지구조 효과에 대한 연구

Ki-Hyun Kim1
,
Yeon-Deok Kim2
,
Beoung-Hyeon Hwang3
,
Yong-Kyu Choi4
,
Sang-Hwan Kim5*
김 기현1
,
김 연덕2
,
황 병현3
,
최 용규4
,
김 상환5*
1Director, DMEC Co., Ltd.
2Ph.D. Student, Dept. of Civil Engineering, Hoseo University
3Master Student, Dept. of Civil Engineering, Hoseo University
4Professor, Dept. of Civil Engineering, Kyungsung University
5Professor, Dept. of Civil Engineering, Hoseo University
1비회원, 동명기술공단 이사
2정회원, 호서대학교 토목공학과 박사과정
3학생회원, 호서대학교 토목공학과 석사과정
4비회원, 경성대학교 토목공학과 교수
5정회원, 호서대학교 토목공학과 교수
* Corresponding Author
30 September 2020. pp. 543-561
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Abstract

This paper is the result of the study on the effect of the support structure of the tunnel steel rib. In tunnel excavation, the top and bottom half excavation methods result in subsidence of steel rib reinforcement due to insufficient support of steel rib reinforcement when the ground is poor after excavation. The foundation of the steel rib installed in the upper half excavates the bottom part of the base, causing the subsidence to occur due to various effects such as internal load and lateral pressure. As a result, the tunnel is difficult to maintain and its safety is problematic. To solve these problems, steel rib support structures have been developed. For the purpose of verification, the behavior of the supporting structure is verified by model experiments reduced to shotcrete and steel rib material similarity, the numerical analysis of ΔP and ΔP generated by bottom excavation by Terzaghi theoretical equation. As a result, it was found that the support structure of 20.100~198.423 kN is required for the 10~40 m section of the depth for each soil of weathered soil~soft rock. In addition, as a result of the reduced model experiment, a fixed level of 50% steel rib deposit of steel rib support structure was installed. The study shows that the installation of steel rib support structures will compensate for uncertainties and various problems during construction. It is also thought that the installation of steel rib support structure will have many effects such as stability, economy, and air reduction.

Keywords
Steel rib
Tunnel auxiliary construction method
Steel rib support structure

본 논문은 터널 강지보 지지구조의 효과에 대한 연구 결과이다. 터널 굴착에 있어 상 ‧ 하 반단면 굴착 공법은 상반굴착 후 지반이 불량한 경우, 강지보재의 지지력 부족으로 강지보재의 침하가 발생한다. 상반 굴착부에 설치된 강지보재 기초부가 하반을 굴착함에 따라 자체 하중, 측압 등 여러 영향으로 강지보재의 침하가 발생된다. 이로 인하여 터널 내공유지 곤란 및 안전성에 문제가 발생하게 된다. 이러한 문제들을 해결하기 위해 강지보재 지지구조체를 개발하였다. 이를 검증하기 위해 Terzaghi 이론식을 이용한 하중 및 하반 굴착으로 발생하는 ΔP를 구해 수치해석을 통한 구조검토 및 검증, 숏크리트 및 강지보재의 재료상사를 통한 축소모형 실험으로 지지구조체 유 ‧ 무에 따른 거동특성을 분석하였다. 그 결과, 풍화토~연암 각 지반의 경우 토피고 10~40 m 구간에 대해 20.100~198.423 kN의 지지구조가 필요한 것으로 나타났다. 또한 축소모형 실험 결과 강지보재 지지구조체 설치 시 강지보재의 침하는 미설치시의 50% 수준으로 나타났다. 본 연구를 통하여 강지보재 지지구조체의 설치로 시공 시 발생하는 불확실성 및 여러 문제점을 보완할 수 있을 것으로 보여진다. 또한 강지보재 지지구조체 설치로 안정성, 경제성 및 공기 단축등과 같은 여러 효과로 적용성 또한 클 것으로 판단된다.

키워드
강지보재
터널 보조공법
강지보 지지구조체
References
1
Kim, K.H. (2020), A study on the structure of tunnel steel rib support, Ph.D. Thesis, Kyungsung University, pp. 13-95.
2
Korea Rail Network Authority (2010), Seoul metropolitan high speed railway (Suseo~Pyoungtaek) design of roadbed and optimization of concrete lining.
3
KS F 2314 (2018), Standard test method for unconfined compression test of soils, National Institute of Technology and Standards, Korea.
4
Park, S.C., Kim, S.S., Shin, Y.W., Shin, H.S., Kim, Y.G. (2008), "A numerical study on the analysis of behavior characteristics of inclined tunnel considering the optimum direction of steel rib", Journal of Korean Tunnelling and Underground Space Association, Vol. 10, No. 3, pp. 245-256.
5
Terzaghi, K. (1946), Rock defects and loads on tunnel support, Rock Tunneling with Steel Supports, eds. R.V. Proctor and T. White, Commercial Shearing Co., Youngstown, pp. 15-99.
6
Tunnel and Underground Space in Korea (2007), Tunnel engineering series 2 tunnel theory and practice, Goomibook, Seoul, pp. 3-4.
7
Yang, J.Y., Choe, B.S., Yun, I.B., Im, H.C. (2010), "Reinforcement case of low depth soil tunnels in urban areas", Magazine of Korean Tunnelling and Underground Space Association, Vol. 12, No. 2, pp. 47-56.
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 : 22
  • No :5
  • Pages :543-561
  • Received Date : 2020-07-27
  • Revised Date : 2020-08-18
  • Accepted Date : 2020-08-18
  • DOI :https://doi.org/10.9711/KTAJ.2020.22.5.543
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