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Model Tests Investigating the Ground Movements Associated with Twin Side-by-Side Tunnel Construction in Clay

점성토 트윈 병렬 터널로 인한 지반침하 연구를 위한 모형실험

  • Ahn, Sung-Kwon (Railroad Structure Research Department, Korea Railroad Research Institute)
  • 안성권 (한국철도기술연구원 철도구조연구실)
  • Received : 2009.07.14
  • Accepted : 2009.10.19
  • Published : 2009.10.31

Abstract

This paper describes the findings obtained from a research project aimed at investigating, via 1 g laboratory model tests, the ground movements caused by multiple side-by-side (sbs) tunnel construction in clay. The ground movements above a second tunnel showed different trends from those observed above a first tunnel. These trends include an increase in the overall volume loss, and a widening of the settlement troughs on the near limb of the trough accompanied by a shift of the maximum settlement towards existing tunnel. This would suggest that the use of simple predictive methods of adopting a Gaussian curve for analysing the ground settlements associated with twin (sbs) tunnel construction is not appropriate. Therefore the current paper adopts a method that modifies the Gaussian curve approach in order to improve the predictions. This paper comments on the parameter selection involved with adopting this new method to apply it to full-scale field situations, and also discusses its limitations.

본 논문은 점성토에 시공된 트윈 병렬 터널로 인해 발생된 지반변형을 연구하기 위해 시행된 1g 모형실험의 과정 및 결과에 대해 기술한다. 트윈 병렬 터널 시공 시, 터널 2(후행터널)로 인한 지반침하는 터널 1(선행터널)로 인한 지반침하와 다른 양상을 보였다. 그 양상은 지반손실의 증가, 침하 폭의 증가, 최대침하의 증가 및 최대침하 위치의 이동으로 요약된다. 따라서 터널 2로 인한 지반침하를 예측하기 위해 기존 Gaussian curve방법을 이용하는 것은 적절치 못하다. 이에 본 논문은 터널 2로 인한 지반침하 예측 개선을 위해 새로운 지반침하 예측 방법(Modification factor방법)을 소개한다. 본 논문은 Modification factor 방법의 실대형 현장 상황 적용을 위한 파라미터 선택에 대해 기술하며, 또한 그 적용 한계에 대해 토의한다.

Keywords

References

  1. Attewell, P.B., Yeates, J., Selby, A.R. (1986), Soil movements induced by tunnelling and their effects on pipelines and structures. Chapman and Hall, NewYork
  2. Clough, G.W., Schmidt, B. (1981), Design and performance of excavations and tunnels in soft clay. In Soft Clay Engineering, Elsevier, 569-634
  3. Cording, E.J., Hansmire, W.H. (1975), Displacement around soft ground tunnels. Proceedings of the Pan-American conference of soil mechanics and foundation engineering, 4, 571-663
  4. Grant, R.J. (1998), Movements around a tunnel in two-layer ground. PhD thesis, City University, United Kingdom
  5. Heath, G.R., West, K. J. F. (1996), Ground movement at depth in London clay. Proceedings of Institution of Civil Engineers, Geotechnical Engineering, 119, 65-74 https://doi.org/10.1680/igeng.1996.28166
  6. Hunt, D.V.L. (2005), Predicting the ground movements above twin tunnels constructed in London clay. PhD thesis, Birmingham University, United Kingdom
  7. Kim, S. (1996), Model testing and analysis of interactions between tunnels in clay. DPhil thesis, Oxford University, United Kingdom
  8. Love, J.P. (1984), Model testing of geogrid in unpaved roads. DPhil thesis, Oxford University, United Kingdom
  9. Mair, R.J. (1979), Centrifuge modelling of tunnel construction in soft clay. PhD thesis, Cambridge University, United Kingdom
  10. Mair, R.J., Taylor, R.N., Bracegirdle, A. (1993), Sub-surface settlement profiles above tunnel. Geotechnique, 43, No.2, 315-320 https://doi.org/10.1680/geot.1993.43.2.315
  11. O’Reilly, M.P., New, B.M. (1982), Settlements above tunnels in the United Kingdom - their magnitude and prediction. Tunnelling’ 82, Ed. Jones, M.J., 173-181
  12. Peck, R.B. (1969) Deep excavation and tunneling in soft ground. 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico City, State-of-the-Art Report, 225-290
  13. Rankin, W.J. (1988), Ground movements resulting from urban tunnelling: Predictions and effects. Conference on Engineering Geology of Underground Movements, Nottingham, BGS, 5, 79-92
  14. White, D.J., Take, W.A. (2002), GeoPIV: Particle image velocimetry (PIV) software for use in geotechnical testing, CUED/D-SOILS/TR322