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A stability study of deep and double-deck tunnels considering shape and reinforcing method of an enlarged section by using numerical analyses

수치해석을 이용한 대심도 복층터널의 확폭단면 형상 및 보강방법에 대한 안정성 연구

Kwang-Ho You1*
,
Su-Hyun Jin2
,
Young-Jin Kim3
유 광호1*
,
진 수현2
,
김 영진3
1Prof., Dept. of Civil Eng., Univ. of Suwon
2Graduate Student, Dept. of Civil Eng., Univ. of Suwon
3Graduate Student, Dept. of Civil Eng., Univ. of Suwon
1수원대학교 토목공학과 교수
2수원대학교 토목공학과 석사과정
3수원대학교 토목공학과 석사과정
*교신저자. *Corresponding Author. 
31 January 2017. pp. 41-56
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Abstract

Recently, the necessity of deep and double-deck tunnels has been grown day by day due to the increase of traffic volume at metropolitans and thus the study on the divergence of those tunnels becomes required. Therefore sensitivity analyses were conducted with FLAC 2D program by selecting ground condition, coefficient of lateral pressure, support pattern, and depth of rock cover as parameters. Ultimately, this study is to find the optimal shape and support method of a diverged section. As the results of this study, it turned out that the box type gave higher stability of the section than arch type unlike the general thought. It can be explained that the arch type has about 30% bigger excavation area than the box type. When the ground conditions are poor, steel pipe grouting reinforcement gives higher stability than rockbolt reinforcement, but its thickness and range do not give a great influence on the stability of the enlarged section.

Keywords
Sensitivity analysis
Deep tunnel
Double-deck tunnel
Enlarged shape
Reinforcement method
Stability

최근 대도시에서는 교통량 증가 등으로 인해 대심도 터널 건설의 필요성이 날로 증대되고 있어서, 대심도 복층터널의 분기에 대한 연구가 필요한 실정이다. 때문에 본 연구에서는 FLAC 2D 프로그램을 이용하여 지반의 종류, 측압계수, 보강방법, 토피고를 매개변수로 선정하여 민감도 분석을 실시하였다. 궁극적으로 터널 분기부에서 최적의 분기부 형상 및 보강방법을 찾고자 하였다. 본 연구결과 일반적인 생각과 달리 박스형 확폭단면이 아치형보다 안정성이 높게 나타났다. 이는 아치형 굴착면적이 박스형보다 약 30% 정도 넓었기 때문인 것으로 판단된다. 또한 지반이 좋지 않은 경우는 록볼트 보강보다 강관그라우팅 보강 시의 안정성이 더 높았으며, 강관그라우팅의 보강두께와 범위는 확폭부의 안정성에 큰 영향을 끼치지 못하였다.

키워드
민감도 분석
대심도 터널
복층터널
확폭형상
보강방법
안정성
References
1
1.Yang, Y.W., Moon, J.J., Shin, T.G. (2016), “A Study on the Inflow Velocity Reduction Measures in Case of Fire Great Depth Underground Double-Deck Tunnel”, Fire Science and Engineering, Vol. 30, No. 2, pp. 81-86 (in Korean).
2
2.La, Y.S., Kim, B.J. (2016), “Effect of Separation Between Main and Divergent Tunnels in Divergence Section of Double-Deck Tunnel on the Stability”, Korean Geosynthetics Society, Vol. 15, No. 2, pp. 45-54 (in Korean).
3
3.Lee, H.S., Moon, H.K. (2016), “Behavior of the Segment Lining due to the Middle Slab and the Lateral Pressure Coefficient in Duplex Tunnel”, Korean Society for Rock Mechanics, Vol. 26, No. 3, pp. 192-200 (in Korean).
4
4.You, K.H., Park, Y.J., Hong, K.Y., Lee, H.K., Kim, J.K. (2005), “Numerical Estimation for Safety Factors of Tunnels Considering the Failure of Supports”, Korean Tunneling and Underground Space Association, Vol. 7, No. 1, pp. 37-49 (in Korean).
5
5.Yoon, W.J. (2014), Influence Analysis of Continuous Pile Walls on the Stability of a Soil Tunnel at the Shallow Depth, Master’s Dissertation, the University of Suwon, p. 58 (in Korean).
6
6.Itasca Consulting Group, Inc. (2005), Fast Lagrangian Analysis of Continua, Ver. 5.0, Itasca Consulting Group, Minnesota, USA.
7
7.Hwang, W.S. (2008), The Reinforced Efficiency for Using Numerical Analysis of Reinforced Tunnel of Umbrella Arch Method, Master’s Dissertation, Kyungpook University, p. 99 (in Korean).
8
8.Park, S.H., Shin, Y.S. (2007), “A Study on the Safety Assessment Technique of a Tunnel Using Critical Strain Concept”, Journal of the Korean Geotechnical Society, Vol. 23, No. 5, pp. 29-41.
9
9.Lee, I.M., Lee, J.S., Nam, S.W. (2003), “Evaluation of Tunnel Face Stability Based on Upper Bound Theorem”, Korean Tunneling and Underground Space Association, Vol. 5, No. 1, pp. 3-11 (in Korean).
10
10.You, K.H., Lee, M.H., Park, Y.J. (2007), “Comparison and Validation on Shotcrete Modelling Method for the Quantitative Stability Estimation of a Tunnel”, Korean Tunneling and Underground Space Association, Vol. 9, No. 2, pp. 99-107 (in Korean).
11
11.Korea Institute of Civil Engineering and Building Technology (2016), Development of Design and Construction Technology for Double Deck Tunnel in Great Depth Underground Space, Annual Report, p. 395 (in Korean).
12
12.Western Metro (2016), Final Design of Private Infrastructure Investment Project on OO-OO Double Track Railway (zone 4), Tunnel Analysis Report, p. 906 (in Korean).
13
13.Road Research Laboratory of Korea Expressway Corporation (2001), Enhancement and Quality Control of Steel Fiber Reinforced Shotcrete (Ⅱ), Korea Expressway Corporation, p. 268 (in Korean).
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 : 19
  • No :1
  • Pages :41-56
  • Received Date : 2017-01-13
  • Revised Date : 2017-01-23
  • Accepted Date : 2017-01-26
  • DOI :https://doi.org/10.9711/KTAJ.2017.19.1.041
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