A Physical Model Test on Behavior of Shield-tunnel Lining according to Drain Conditions

Gou-Moon Choi; Chan-Young Yune; Sang-Joon Ma

doi:10.7843/kgs.2014.30.5.55

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2014 Vol.30, Issue 5 Preview Page Next Page

A Physical Model Test on Behavior of Shield-tunnel Lining according to Drain Conditions 배수조건에 따른 쉴드터널 라이닝의 거동연구를 위한 모형실험

31 May 2014. pp. 55-65

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Abstract

Most shield tunnels are designed based on the assumption of a undrained condition. But they are operated as drained tunnels in which underground water flows and passes through a drainage facility. Therefore, it is necessary that the drainage condition be considered in the shield tunnel design. In this research, new testing device which can simulate the underground tunnel located below ground water level, was developed. Total stress and pore water pressure were examined and an inflow water into an inner pipe was measured using the testing device. Test results showed that the total stress, which was the sum of effective stress and pore pressure, increased more in an undrained condition and an inflow water into an inner pipe was proportional to the water pressure but inversely proportional to the loading stress. Consequently, if the drainage is considered in the shield tunnel design, the more economical design can be expected because of the stress reduction of the lining.

Keywords

Shield tunnel design

Underground water

Total stress

Water pressure

Drain condition

대부분의 쉴드터널은 비배수조건으로 설계되지만 현장에서 터널 내부로 지하수가 유입되고 배수시설을 통하여 배출되는 배수터널처럼 작동하기 때문에 쉴드터널 설계에서 배수조건이 고려될 필요가 있다. 본 연구에서는 배수조건과 응력조건 조절을 통하여 지하수면 아래에 위치한 터널을 모사할 수 있는 실험장비를 개발하였다. 모형실험을 통하여 지중내에 작용하는 전응력 및 간극수압을 조사하였고 배수내관의 유입유량을 측정하였다. 실험결과 간극수압과 유효응력의 합으로 나타나는 전응력의 증가율이 비배수조건에서 더 크게 나타났고, 유입유량은 수압에 비례하고 재하응력에 반비례하였다. 결과적으로 쉴드터널에서 배수를 고려한다면 응력이 감소되기 때문에 보다 경제적인 설계가 가능할 것으로 예상된다.

References

본 연구는 국토해양부가 출연하고 한국건설교통기술평가원에서 시행한 2012 건설기술혁신사업(과제명 : 배수 유로홈을 이용, 수압 저감을 통한 공사비 절감 슬림형 세그먼트 터널 라이닝 기술 개발)의 지원으로 수행되는 것으로 연구를 가능케 한 국토해양부에 감사드립니다.

참고문헌 (References)

1.Atkinson, J. H. and Mair, R. J. (1983), Loads on leaking and watertight tunnel linings, sewers and buried pipes due to groundwater, Technical note, Geotechnique, Vol.33, No.3, pp.341-344.

2.Chang, S. H., Lee, G. P., Choi, S. W., and Bae, G. J. (2011), State of the Art of Segment Lining in Shield Tunnel and Statistical Analysis of Its Key Design Parameters, TUNNEL & UNDERGROUND SPACE, Vol.21, No.6, pp.427-438.

3.Choi, G. M., Yune, C. Y., and Ma, S. J. (2013), An Experiment with a model to study action of shield-tunnel lining subject to drain condition. KGS Fall National Conference 2013, pp.1224-1229.

4.Dimitrios Kolymbas and Peter Wagner (2007), Groundwater ingress to tunnels - The exact analytical solution, Tunnelling and Underground Space Technology 22, pp.23-27.

5.Korean Tunnelling and Underground Space Association (2007), Tunnel design standard, Ministry of Construction and Transportation.

6.Korea expressway corporation (2009), Road design criteria, Vol.4.

7.Lee, I. M., Kim, Y. J., Lee, M. J., and Nam, S. W. (1993), Groundwater Considerations in Tunnel Design, KGS Spring ‘93 National Conference/Geotechnical Engineering and Tunnelling Technology. pp.1-8.

8.Shin, J. H., Ahn, S. R., and Shin, Y. S. (2005), Pore Water Pressure Development Mechanism and Sustainability of Tunnel Linings, 2005 Korean Society of Civil Engineers Annual Convention, pp.2943-2950.

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 30
No :5
Pages :55-65
Received Date : 2014-02-10
Revised Date : 2014-04-24
Accepted Date : 2014-05-13
DOI :https://doi.org/10.7843/kgs.2014.30.5.55

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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