Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Model for predicting ground surface settlement by field measuring and numerical analysis in shield TBM tunnel

현장계측과 수치해석에 의한 쉴드TBM 터널의 지표침하 예측모델

  • Received : 2013.04.22
  • Accepted : 2013.05.06
  • Published : 2013.05.31
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Abstract

In this study, more convenient model(S-model) for predicting ground surface settlement is developed through comparing field monitoring data of the domestic subway applied shield TBM method with conventional equation & numerical analysis. Sample stations are chosen from whole of excavation section and lateral & vertical ground surface settlement characteristic with excavation are analysed. Based on analysis result, through the comparison with actual monitoring data, the model that is possible to compute maximum surface settlement and settlement influence area is suggested with assumption that lateral surface settlement forms are composed relaxed zone and elastic zone. In addition, vertical ground surface settlement patterns with excavation are similar to cubic-function and S-model with assumption that coefficients are function of tunnel diameter and depth is suggested. Consequently, the ground surface settlement patterns are significantly similar to actual monitoring data and numerical method result. Thus, as a result, when tunnels are excavated using sheild TBM through rather soft weathered soil & rock layer, prediction of ground surface settlement with excavation using convenient S-model is practicable.

본 연구는 쉴드 TBM을 적용한 국내 지하철 현장의 계측 자료를 분석하고 기존 이론식에 의한 모델 및 수치해석 결과와의 비교를 통해 보다 간편한 지표침하 예측 S-모델을 개발하였다. 이를 위해 전체 굴착 구간 중, 대표 station을 선정하여 횡방향 지표침하 특성과 굴착 진행에 따른 종방향 지표침하 특성을 분석하였다. 분석 결과를 바탕으로 횡방향 지표침하 형태는 이완영역과 탄성영역으로 구성된다고 가정하고 실제 계측 자료와의 비교를 통해 최대 지표침하량과 침하 영향 범위를 산정할 수 있는 모델을 제안하였다. 이에 의하면 굴착 진행에 따른 종방향 지표침하 형태는 3차 함수 특성과 유사하였으며 각각의 계수를 터널 직경 및 토피고의 함수로 하여 S-모델을 제안하였고, 실제 계측 값 및 수치해석 결과와 상당히 유사한 형태의 지표침하를 얻을 수 있었다. 따라서 본 연구결과를 통해 다소 연약한 풍화토, 풍화암 지층을 통과하는 쉴드 TBM 굴착 시공 시, 간편 S-모델을 이용하여 굴착에 따른 지표침하의 예측이 가능할 것으로 판단된다.

Keywords

References

  1. Attewell, P.B., Farmer, I.W. (1974), "Ground deformations resulting from shield tunnelling in London Clay" Canadian Geotech, J. Vol. 11, pp. 380-395. https://doi.org/10.1139/t74-039
  2. Attewell, P.B. (1978), "Ground movements caused by tunnelling in soil" Proc. Int. Conf. on Large movements and Structures, Pentech Press, London, pp. 812-948.
  3. Attewell, P.B., Woodman, J.P. (1982), "Predicting the dynamics of ground settlement and its derivatives caused by tunnelling in soil", Ground Engineering Vol. 15, pp. 13-22.
  4. Attewell, P.B., Yeates J., Selby, A.R. (1986), "Soil movements induced by tunnelling and their effects on pipelines and structures", Blackie, London.
  5. Boscardin, M.D., Cording, E.J. (1989), "Building response to excavation induced settlement", J. Geotech. Engng ASCE, Vol. 115, pp. 1-21. https://doi.org/10.1061/(ASCE)0733-9410(1989)115:1(1)
  6. Bowers, K.H., Hiller, D.M., New, B.M. (1996), "Ground movement over three years at the Heathrow Expresss Trial Tunnel", Mair and Tayler (eds.) 1996, pp. 647-652.
  7. Chang, S.H., Choi, S.W., Lee, G.P., Bae, G.J. (2011), "Rock TBM design model derived from the multi-variate regression analysis of TBM driving date", Journal of Korean Tunnelling and Underground Space Association, Vol. 13, No. 6, pp. 531-555.
  8. Davis, E.H., Gunn, M.J., Mair, R.J., Seneviratne, H.N. (1980), "Stability of shallow tunnels and underground openings in cohesive materials", Geotechnique, Vol. 30, No. 4, pp. 397-416. https://doi.org/10.1680/geot.1980.30.4.397
  9. Glossop, N.H., Farmer, I.W. (1979), "Settlement Associated with Removal of Compressed Air Pressure during Tunnelling in Alluvial Clay" Geotechnique, Vol. 29, No. 1, pp. 67-72. https://doi.org/10.1680/geot.1979.29.1.67
  10. Kim, M.M., Kim, S.Y., Lee, J.H. (2004), "Verification for the VisualFEA", Korean Geotechnical Society.
  11. Kim, S.H., Kim, J.D., Park, I.J. (2011), "An experimental study on screw conveyor system of EPB shield TBM", Journal of Korean Tunnelling and Underground Space Association, Vol. 13, No. 6, pp. 519-530.
  12. Lee, K.M., Rowe, R.K., Lo. K.Y. (1992), "Subsidence owing to tunnelling, I. Estimating the gap parameter", Canada, Geotech. J., Vol. 29, pp. 929-941. https://doi.org/10.1139/t92-104
  13. Lee, J,Y., Ahn S.Y. (2011), "Interactive visualization of elasto-plastic behavior though stress paths and yield surfaces in finite element analysis", Finite Elements in Analysis and Design Vol. 47, pp. 496-510. https://doi.org/10.1016/j.finel.2010.12.017
  14. Mair, R.J., Tayler, R.N., Bracegirdle, A. (1993) "Subsurface settlement prifile above tunnels in clays", Geotechnique, Vol. 43, No. 2, pp. 312-320.
  15. Mair, R.J., Tayler, R.N. (1996), "Proc. int. symp. on geotechnical aspects of underground construction in soft ground", Balkema, Rotterdam.
  16. Muir Wood, A.M. (1970), "Soft ground tunnelling", Technol Pot. Tunnelling (Johannesburg), pp. 167-174.
  17. Rowe, R.K., Lee, K.M. (1992), "Subsidence owing to tunnelling, II. Evaluation of a prediction technique", Canada, Geotech. J., Vol. 29, pp. 941-954. https://doi.org/10.1139/t92-105
  18. O'Reilly, M.P., New, B.M. (1982), "Settlements above tunnels in the United Kingdom - their magnitude and prediction", 82 Symposium. Institution of Mining and Metallurgy, London, pp. 173-181.
  19. Peck, R.B. (1969), "Deep excavations and tunnels in soft ground", Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico City, State of the Art Volume pp. 225-290.
  20. Roh, B.K., Kon, S.Y., Choo, S.Y. (2012), "Infiltration behavior of the slury into tunnel face during slury shield tunnelling in sandy soil" Journal of Korean Tunnelling and Underground Space Association, Vol. 13, No. 3, pp. 261-275.
  21. Simic, D., Gittoes, G. (1996), "Ground behavior and potential damage to buildings caused by the construction of a large diameter tunnel for the Lisbor Metro", in Mair and Tayler (eds) 1996. 745-750.
  22. Suwanswat, S. (2007) "Longitudinal surface settlements induced by EPB tunnelling in Bangkok Clay" Underground Space the 4th Dimension of Metropolices, Vol. 2, pp. 921-926.