Behavior of double deck tunnel due to feature change and variation of ground water table

No-Hyeon  Park; Ho-Jong  Kim; Jong-Ho Shin

doi:10.9711/KTAJ.2016.18.6.581

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2016 Vol.18, Issue 6 Preview Page

Behavior of double deck tunnel due to feature change and variation of ground water table 다목적 복층터널의 기능전환과 지하수위 변화에 따른 거동분석

30 November 2016. pp. 581-591

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Abstract

Several attempts to construct multi-purpose tunnel for both road and waterway have been made. The multi-purpose tunnel is mainly used as a road tunnel, however it is transferred to waterway to control flood during rainy season. The planning of the multi-purpose tunnel is recognized as cost-effective way of infrastructure construction. In case of the multi-purpose tunnel constructed beneath groundwater table, seasonal fluctuation of groundwater table and repeated flow in the tunnel may cause long-term deterioration of the tunnel system. In this study, the behavior of multi-purpose tunnel in view of groundwater table or flow in the tunnel is investigated using model test and numerical modeling method. The results have shown that rising of groundwater table caused buoyant force to the tunnel and the fluctuation of rainwater in the tunnel generated loosening of surrounding ground. It is recommended to evaluate the effect of the long-term water pressure variation in the design of a multi-purpose tunnel.

Keywords

Multi-purpose tunnel

Fluctuation of water level

Inner water pressure

Long-term deterioration

최근 사회기반시설의 투자효율성을 높이기 위하여 평상 시 도로터널로 운영되지만 홍수 시 수로로 이용되는 수로·도로 다목적 터널의 계획이 시도되고 있다. 이러한 다목적 터널은 수로터널로의 이용이 한시적이기 때문에 내수압과 지하수위가 일정하지 않아 터널 내부와 외부의 압력변화가 상당할 수 있다. 특히 지하수위 아래에 건설 된 다목적 터널의 경우 장기간 운영 중에 발생하는 계절적 압력변화는 터널에 반복하중으로 작용하여 구조물과 인접지반의 열화로 이어질 가능성이 있다. 본 연구에서는 다목적 터널의 외부 및 내부 수위조건에 따라 발생할 수 있는 구조물의 거동특성을 모형실험 및 수치해석을 통하여 조사하였다. 그 결과 수위변화로 인한 터널 거동의 주 원인은 부력이며, 터널 내부 및 외부의 반복적인 수위변화는 터널 주변지반의 이완영역을 확대시키는 것으로 나타났다. 따라서 다목적 터널의 설계 시 수위변화에 따른 영향검토가 필요하며 경우에 따라 저항성을 유지시킬 수 있는 대책의 검토가 필요하다.

키워드

다목적 터널

반복수위

내수압

장기 열화

References

1.Brekke, T.L., Ripley, B.D.. (1987), “Design guidelines for pressure tunnels and shafts”, EPRI Report, AP-5273 Research Project 1745-17.

2.Cheuk, C.Y., White, D.J., Bolton, M.D. (2008), “Uplift mechanisms of pipes buried in sand”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 134, No. 2, pp. 154-163.10.1061/(ASCE)1090-0241(2008)134:2(154)

3.Choi, C.U. (2006), “A study on the design of under-ground structures in the consideration of the uplift pressure”, Master’s dissertation, University of Seoul, Graduate School.

4.Firouzian, S., Vahdatirad, M.J., Barari, A., Rezaei, D. (2009), “Modeling of the uplift response of buried pipelines”, Electronic Journal of Geotechnical Engi-neering, Vol. 14, pp. 1-15.

5.Kim, H.J., Kim, H.A., Joo, E.J., Shin, J.H. (2015), “Review the buoyancy effect of the double deck tunnels during operation”, Journal of Korean Tunnelling and Underground Space Association, Vol. 17, No. 6, pp. 301-314.10.9711/KTAJ.2015.17.6.623

6.Kim, N.Y., Kim, H.J. (2012), “Overseas case study regarding underground roads”, Geoenvironmental Engineering, Vol. 13, No. 5, pp. 13-21.

7.Korea Rail Network Authority (2013), “Railway design standard for roadbed”.

8.Kwon, S.H., Kim, J.H., Chung, G.H. (2015), “Prorosal of design criteria on multi-functional tunnel for the urban traffic tunnel to flooding bypass”, Journal of the Korea Academia-Industrial, Vol. 16, No. 5, pp. 3518-3524.10.5762/KAIS.2015.16.5.3518

9.Liu, X.Y., Yuan, D.J. (2015), “Mechanical analysis of anti-buoyancy safety for a shield tunnel under water in sands”, Tunnelling and Underground Space Technology, Vol. 47, pp. 153-161.10.1016/j.tust.2014.12.005

10.Shin, J.H. (2015), Geomechanics & Engineering Ⅱ, pp. 301-314.

11.Shin, J.H., Shin, Y.S., Ahn, S.R., Park, D.I. (2006), “A study on the long-term behavior due to the hydraulic interaction between ground water and tunnel”, Korean Geotechnical Society Spring Conference 2006, pp. 239-248.

12.White, D.J., Barefoot, A.J., Bolton, M.D. (2001), “Centrifuge modelling of upheaval buckling in sand”, International Journal of Physical Modelling in Geo-technics, Vol. 2, No. 1, pp. 19-28.10.1680/ijpmg.2001.010202

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 : 18
No :6
Pages :581-591
Received Date : 2016-11-14
Revised Date : 2016-11-24
Accepted Date : 2016-11-28
DOI :https://doi.org/10.9711/KTAJ.2016.18.6.581

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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