Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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A Study on the Behaviour of a Single Pile to Adjacent Tunnelling Conducted in the Lateral Direction of the Pile

단독말뚝의 측면으로 시공되는 터널에 의한 말뚝의 거동 연구

  • 이철주 (강원대학교 토목공학과)
  • Received : 2010.09.11
  • Accepted : 2010.10.26
  • Published : 2011.01.01
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Abstract

Three-dimensional(3D) numerical analyses have been conducted to study the behaviour of a single pile to adjacent tunnelling conducted in the lateral direction of the pile. In the numerical analyses, the interaction between the tunnel, the pile and the soil next to the pile has been analysed. The study includes the pile settlement, the relative shear displacement between the pile and the soil, the shear stresses at the soil next to the pile and the axial force on the pile. In particular, the shear stress transfer mechanism along the pile related to the tunnel advancement has been rigorously analysed. Due to changes in the relative shear displacement between the pile and the soil next to the pile during the tunnel advancement, the shear stress and the axial force distributions along the pile have been changed. Downward shear stress developed above the tunnel springline (Z/L=0.0-0.7~0.8), while upward shear stress is mobilised below the tunnel springline (Z/L=0.7~0.8-1.0) resulting in compressive force on the pile, where Z is the pile location and L is the pile length. Maximum compressive force of about $0.475P_a$ was developed on the pile after completion of tunnel advancement, where $P_a$ is the allowable pile capacity. Some insights into the pile behaviour to tunnelling obtained from the numerical analyses will be reported and discussed.

본 연구에서는 단독말뚝의 측면에서 시공되는 터널에 의한 말뚝의 거동에 대하여 3차원 수치해석을 통하여 분석하였다. 수치해석을 통하여 터널-말뚝-지반의 상호거동에 대한 심도 있는 분석을 실시하였다. 수치해석을 통해 말뚝의 침하, 말뚝과 주변지반 사이의 상대변위, 전단응력 및 말뚝의 축력변화를 고찰하였다. 특히 터널굴착에 의한 전단응력의 전이과정에 대한 심도 있는 분석을 실시하였다. 터널굴착에 의한 말뚝과 인근지반에서의 상대변위 변화로 인하여 말뚝에 작용하는 전단응력 및 축력의 분포가 변하게 되는 것으로 나타났다. 터널 중심부의 상부에서는 하향의 전단응력이 발생하는 반면(Z/L=0.0-0.7~0.8), 그 하부에서는 (Z/L=0.7~0.8-1.0) 상향의 전단응력이 발생하여 말뚝에 압축력이 발생된다, 이때 Z는 임의의 심도, L은 말뚝의 길이다. 터널굴착이 종료된 후 말뚝에는 최대 $0.475P_a$의 압축력이 발생하였다, 이때 $P_a$는 말뚝의 설계지지력이다. 수치해석을 통해서 도출된 터널굴착이 말뚝 거동에 미치는 영향에 대해 상세히 고찰하였다.

Keywords

References

  1. 대한토목학회(2005), 도심지 터널 근접시공을 중심으로, 제5회 터널 시공기술 향상 대토론회, 대한토목학회.
  2. Bezuijen, A. and Schrier, J. V. D.(1994), The Influence of a Bored Tunnel on Pile Foundations, Centrifuge 94, (Edited by Lee & Tan), Balkema, Rottterdam, pp. 681-686.
  3. Cheng, C. Y., Dasari, G. R., Chow, Y. K. and Leung, C. F. (2007), Finite Element Analysis of Tunnel-soil-pile Interaction using Displacement Controlled Model, Tunnelling and Underground Space Technology, Vol. 22, pp. 450-466. https://doi.org/10.1016/j.tust.2006.08.002
  4. Cheng, C. Y., Dasari, G. R, Leung, C. F. and Chow, Y. K.(2003), Finite Element Study of Tunnel-soil-pile Interaction, National University of Singapore Publication, Hulme Prize Winning Paper.
  5. Chen, L. T., Poulos, H. G. and Loganathan, N.(1999), Pile Responses Caused by Tunnelling. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 125, No. 3, pp. 207-215. https://doi.org/10.1061/(ASCE)1090-0241(1999)125:3(207)
  6. Chiang, G. H.(2002), The Load Transfer Behavior of Piles Caused by Nearby Tunnelling, Master thesis, National Central University, Taiwan (in Chinese).
  7. Coutts, D. R. and Wang, J.(2000), Monitoring of Reinforced Concrete Piles under Horizontal and Vertical Loads due to Tunneling, Tunnels and Underground Structures, Balkema, London, pp. 541-546.
  8. Davisson, M. T.(1972), High Capacity Piles, Proceedings and Lecture Series in Innovations in Foundation Construction, ASCE, Illinois Section, pp. 82-112.
  9. Huang, M., Zhang, C. and Li, Z.(2009), A Simplified Analysis Method for the Influence of Tunnelling on Grouped Piles, Tunnelling and Underground Space Technology, Vol. 24, pp. 410-422. https://doi.org/10.1016/j.tust.2008.11.005
  10. Jacobsz, S. W.(2002), The Effects of Tunnelling on Piled Foundations, Ph D thesis, University of Cambridge, pp. 3-1-3-28, 5-1-5-70.
  11. Jacobsz, S. W.(2003), Tunnelling Effects on Piled Foundations, Tunnels and Tunnelling International, pp. 28-31.
  12. Kaalberg, F. J., Teunissen, E. A. H., van Tol, A. F. and Bosch, J. W.(2005), Dutch Research on the Impact of Shield Tunnelling on Pile Foundations, Geotechnical Aspects of Underground Construction in Soft Ground, Proceedings of 5th International Conf. of TC 28 of the ISSMGE, pp. 123-133.
  13. Kitiyodom, P., Matsumoto, T. and Kawaguchi, K.(2005), A Simplified Analysis Method for Piled Raft Foundations Subjected to Ground Movements Induced by Tunneling, Int. J. Numer. Anal. Meth. Geomech, Vol. 29, pp. 1485-1507. https://doi.org/10.1002/nag.469
  14. Lee, C. J. and Jacobsz, S. W.(2006), The Influence of Tunnelling on Adjacent Piled Foundations, ITA 2006, CD.
  15. Lee, C. J. and Chiang, K. H.(2007), Responses of Single Piles to Tunnelling-induced Soil Movements in Sandy Ground, Canadian Geotechnical Journal, Vol. 44, pp. 1224-1241. https://doi.org/10.1139/T07-050
  16. Lee, G. T. K., and Ng, C. W. W.(2005), The Effects of Advancing Open Face Tunnelling on an Existing Loaded Pile, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 131, No. 2, pp. 193-201. https://doi.org/10.1061/(ASCE)1090-0241(2005)131:2(193)
  17. Lee, R. G., Turner, A. J., and Whitworth, L. J.(1994), Deformations Caused by Tunneling beneath a Piled Structure, Proceedings of 13th International Conference on Soil Mechanics and Foundation Engineering, New Delhi, India, Vol. 2, pp. 873-878.
  18. Lee, S. W., Cheang, W. W. L., Swolfs, W. M. and Brinkgreve, R. B. J.(2009), Tunneling Near a Building Supported by Endbearing Piles, Proc. of Hong Kong Tunneling Conf, pp. 135-145.
  19. Lee, S. W., Choy, C. K. M., Cheang, W. W. L., Swolfs, W. and Brinkgreve, R.(2010), Modeling of Tunneling Beneath a Building Supported by Friction Bored Piles, The 17th Southeast Asian Geotechnical Conference (Accepted).
  20. Lee, Y. J.(2004), Tunnelling Adjacent to a Row of Loaded Piles. Ph D Thesis, University College London, University of London, pp. 35-64.
  21. Loganathan, N. and Poulos, H. G.(1998), Analytical Prediction for Tunneling-induced Ground Movement in Clays. J. Geotech. Geoenvironmental Eng., ASCE, Vol. 124, No. 9, pp. 846-856. https://doi.org/10.1061/(ASCE)1090-0241(1998)124:9(846)
  22. Loganathan, N., Poulos, H. G. and Stewart, D. P.(2000), Centrifuge Model Testing of Tunneling-induced Ground and Pile Deformations, Geotechnique, Vol. 50, No 3, pp. 283-294. https://doi.org/10.1680/geot.2000.50.3.283
  23. Mair, R. J. and Taylor, R. N.(1997), Theme Lecture: Bored Tunnels in the Urban Environment, Proc. 14th International Conference on Soil Mechanics and Foundation Engineering, Hamburg, Balkema, Vol. 4, pp. 2353-2385.
  24. Morton, J. D. and King, K. H.(1979), Effect of Tunneling on the Bearing Capacity and Settlement of Piled Foundation, Proceedings of Tunneling 79, Institution of Mining and Metallurgy, London, pp. 57-68.
  25. Mroueh, H. and Shahrour, I.(2002), Three-dimensional Finite Element Analysis of the Interaction between Tunnelling and Pile Foundation. Int. J. Numer. Anal. Meth. Geomech, Vol. 26, pp. 217-230. https://doi.org/10.1002/nag.194
  26. Ong, O. W., Leung, C. F., Yong, K. Y. and Chow, Y. K. (2006), Pile Responses due to Tunneling in Clay, Physical Modeling in Geotechnics, 6th International Conference on Physical Modeling in Geotechnics, Taylor & Francis Group, London, pp. 1177-1182.
  27. Pang, C. H.(2006), The Effects of Tunnel Construction on Nearby Pile Foundation, Ph D thesis, The National University of Singapore, pp. 27-56.
  28. Selemetas, D.(2005), The Response of Full-scale Piles and Piled Structures to Tunnelling, Ph D thesis, University of Cambridge, pp. 113-219.
  29. Vermeer, P. A., and Bonnier, P. G.(1991), Pile Settlements due to Tunnelling, Proc. 10th European Conference on Soil Mechanics and Foundation Engineering, Florence, Balkema, Vol. 2, pp. 869-872.
  30. Xu, K. J. and Poulos, H. G.(2001), 3-D Elastic Analysis of Vertical Piles subjected to "Passive" Loadings, Comput. Geotech. Vol. 28, pp. 349-375. https://doi.org/10.1016/S0266-352X(00)00024-0
  31. Yong, K. Y. and Pang, C. H.(2004), Geotechnical Challenges of the Mass Rapid Transit(MRT) System in Singapore, In Malaysian Geotechnical Conference 2004, March 2004, Special Lecture.