연약지반 다수의 터널 병렬시공 시 기존터널의 거동

The Behaviours of Existing Tunnels in response to Multiple side-by-side Tunnel Construction in Soft Ground

  • 투고 : 2008.07.17
  • 심사 : 2008.09.10
  • 발행 : 2008.11.30

초록

본 논문은 연약지반에서 복수의 신규터널 시공을 모사하기 위해 실시된 모형실험 과정 및 결과에 대해 기술한다. 새로운 터널이 기존터널에 근접하여 시공될 때 기존터널의 거동을 조사하기 위해 1/50의 상사율로 모형실험이 실시되었다. 모형 터널은 압밀된 Speswhite Kaolin 점토에 시공되었으며, 오거 형상 굴착기와 실드로 구성된 터널굴착 장비가 사용되었다. 기존터널의 거동 계측을 위해 스트레인 게이지와 변형계가 사용되었다. 모형시험 분석 결과는 영국 Old Street 런던 지하철 Northern Line 확장공사 현장계측 결과와 비교되었다. 또한, 모형시험 결과는 동일한 실험기구 및 실험방법이 사용된 별도의 모형실험에서 계측된 지반변형 데이터와도 비교되었다.

This paper describes laboratory experiments modelling multiple tunnel construction in soft ground. A series of small-scale model tests have been conducted at approximately 1/50 scale in order to investigate the behaviours of existing tunnels in response to the construction of new tunnels in close proximity. The model tunnels were constructed in a consolidated Speswhite Kaolin clay using a tunnelling device involving an auger type cutter within a shield. Strain gauges and LVDTs were used for instrumenting the existing tunnels. The findings obtained from the analyses of these tests were compared to the field measurements involving the reconstruction of the Northern Line London Underground Ltd. tunnels at Old street, United Kingdom. The results were also compared to the ground movement measurements obtained from a separate set of tests undertaken using the same apparatus and experimental procedures.

키워드

참고문헌

  1. Addenbrooke, T.I., 'Numerical modelling in stiff clay'. Ph.D. thesis, Imperial college, UK. 1996
  2. Ahn, S.K., 'Model tests investigating the interaction between closely spaced tunnels in clay'. Ph.D. thesis, Birmingham University, UK. 2007
  3. Cooper, M.L., 'Tunnel-induced ground movements and their effects on existing tunnels and tunnel linings'. Ph.D. thesis, Birmingham University, UK. 2001
  4. Cording, E.J., 'Hansmire, W.H., Displacement around soft ground tunnels. Proceedings of the Pan-American conference of soil mechanics and foundation engineering', 1975. 4, pp. 571-663
  5. Grant, R.J., 'Movements around a tunnel in two-layer ground'. Ph.D. thesis, City University, UK. 1998
  6. Hunt, D.V.L., 'Predicting the ground movements above twin tunnels constructed in London clay'. Ph.D. thesis, Birmingham University, UK. 2005
  7. Kim, S., 'Model testing and analysis of interactions between tunnels in clay'. Ph.D thesis, Oxford University, UK. 1996
  8. Love, J.P., 'Model testing of geogrid in unpaved roads'. Ph.D. thesis, Oxford University, UK. 1984
  9. Mair, R.J., 'Centrifuge modelling of tunnel construction in soft clay'. Ph.D. thesis, Cambridge University, UK. 1979
  10. Nyren, R., 'Field measurements above twin tunnels in London clay'. Ph.D. thesis, Imperial college, UK. 1998
  11. Selby, A.R., 'Surface movements caused by tunnelling in two-layer soil'. Engineering Geology of Underground Movements (eds. Bell, F.G., Culshaw, M.G., Cripps, J.C., Lovell, M.A.), Geological Society Engineering Geology Special Publication, No. 5, 1988, pp. 71-77
  12. Taylor, R.N., 'Ground movements associated with tunnels and trenches'. Ph.D. thesis, Cambridge University, UK. 1984
  13. Ward, W.H., Pender, M.J., 'Tunnelling in soft ground - General Report'. Proceedings of 10th international conference on Soil Mechanics and Foundation Engineering, Session 2, 1981, pp. 261-275