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2025 Vol.35, Issue 2

Research Article

A Study on Design Improved Method for Economical Design of Cast-in-Place Lining for Expressway Tunnel

고속도로 터널 현장타설 라이닝의 경제적인 설계를 위한 설계 개선방안 검토 연구

Tae Hyun Lee1
,
Heui Soo Han2*
이 태현1
,
한 희수2*
1Ph.D. Candidate, Department of Civil Engineering, Kumoh National Institute of Technology
2Professor, Department of Civil Engineering, Kumoh National Institute of Technology
1국립금오공과대학교 토목공학과 박사과정
2국립금오공과대학교 토목공학과 교수
*Corresponding Author
30 June 2025. pp. 171-181
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Abstract

In Korea, the design of cast-in-place linings for highway tunnels predominantly follows the ultimate strength design (USD) method. However, the growing demand for more economical and efficient design and construction has led to the need to introduce the limit state design (LSD) approach. Although there have been domestic design cases and research adopting LSD, most have applied standards originally intended for bridges and road structures, and have mainly focused on segmental lining designs. In 2017, AASHTO introduced the first tunnel design standard based on the load resistance factor design (LRFD) method, a form of LSD. However, its application in Korea remains limited. Therefore, this study examines the applicability of the LRFD method by comparing a design based on the conventional USD method with an improved design using LRFD. The comparison showed that the moment in the lining was reduced by 50%, and the axial force by 52%. Furthermore, the review of the P-M interaction diagram indicated a resistance strength of 109% relative to the ultimate load. Based on these results, the design adequacy was verified, and it was concluded that LRFD can prevent overdesign and enable a more rational and cost-effective tunnel lining design.

Keywords
limit state design
load resistance factor design
cast-in-place lining
structural analysis
tunnel

국내 고속도로 터널 현장타설 라이닝의 설계는 대부분 강도설계법(ultimate strength design, USD)을 적용한다. 하지만, 지속적인 경제적인 설계와 시공이 요구에 따라 한계상태설계법(limit state design, LSD)의 도입이 요구되는 실정이다. 한계상태설계법(LSD)을 도입한 국내 설계 및 연구는 있지만 대부분 교량과 도로구조물 등에 대한 한계상태설계법(LSD) 기준을 차용하여 터널에 적용하였고, 세그먼트 라이닝 설계에 국한하여 수행되었다. 2017년도 AASHTO에 의하여 한계상태설계법(load resistance factor design, LRFD)을 적용한 최초의 터널 설계기준이 제시되었으며, 이는 국내에 적용된 사례가 드문 실정이다. 따라서 본 연구에서는 기존 강도설계법(USD)을 적용하여 수행된 설계와 한계상태설계법(LRFD)을 적용하여 개선된 설계를 비교하여 한계상태설계법(LRFD)의 적용성을 검토하였다. 검토 결과, 라이닝에 발생하는 모멘트는 50% 감소하였고, 축력은 52% 감소하는 것으로 나타났다. 또한 P-M 상관도를 검토한 결과, 극한하중대비 109%의 저항강도를 보였으며, 이에 따라 적정성이 검토되었으며, 과다설계를 방지하여 보다 합리적이고 경제적인 설계가 가능할 것으로 검토되었다.

키워드
한계상태설계법
하중저항계수설계법
현장타설 라이닝
구조해석
터널
References
1

AASHTO (American association of state highway and transportation officials), 2007, AASHTO LRFD bridge design specification (4th Edition).

2

AASHTO (American association of state highway and transportation officials), 2017, AASHTO LRFD road tunnel design and construction guide specifications (1st Edition).

3

CEN (European Committee for Standardization), 2004, Eurocode 7: Geotechnical design - Part 1: General rules.

4

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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 35
  • No :2
  • Pages :171-181
  • Received Date : 2025-03-31
  • Revised Date : 2025-06-11
  • Accepted Date : 2025-06-17
  • DOI :https://doi.org/10.9720/kseg.2025.2.171
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