DOI QR코드

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Investigation of divergence tunnel excavation according to horizontal offsets between tunnels

  • Hong, Soon-Kyo (Department of Civil Engineering, Seoul National University of Science and Technology) ;
  • Oh, Dong-Wook (Department of Civil Engineering, Seoul National University of Science and Technology) ;
  • Kong, Suk-Min (Department of Civil Engineering, Seoul National University of Science and Technology) ;
  • Lee, Yong-Joo (Department of Civil Engineering, Seoul National University of Science and Technology)
  • 투고 : 2019.12.11
  • 심사 : 2020.03.02
  • 발행 : 2020.04.25

초록

In most cases in urban areas, construction of divergence tunnel should take into account proximity to existing tunnel in operation. This inevitably leads to deformation of adjacent structures and surrounding ground. Preceding researches mainly dealt with reinforcing of the diverging section for the stability including the pillar. This has limitations in investigating the interactive effects between existing structures and surrounding ground due to the excavation of the divergence tunnel. In this study, the complex interactive behavior of pile, the operating tunnel, and the surrounding ground according to horizontal offsets between the two adjacent tunnels was quantitatively analyzed based on conditions diverged from operating tunnel in urban areas. The effects on ground structures confirmed by analyzing the ground surface settlements, pile settlements, and the axial forces of the pile. The axial forces of lining in operating tunnel investigated to estimate their impact on existing tunnel. In addition, in order to identify the deformation of the surrounding ground, the close range photogrammetry applied to the laboratory model test for confirming the underground displacements. Two-dimensional finite element numerical analysis was also performed and compared with the results. It identified that the impact of excavating a divergence tunnel decreased as the horizontal offset increased. In particular, when the horizontal offset was larger than 1.0D (D is the diameter of operating tunnel), the impact on existing structures further reduced and the deformation of surrounding ground was concentrated at the top of the divergence tunnel.

키워드

과제정보

연구 과제 주관 기관 : SeoulTech (Seoul National University of Science and Technology)

This study was supported by the Research Program funded by SeoulTech (Seoul National University of Science and Technology).

참고문헌

  1. Ahn, B.H. (2002), "A study on the characteristics of the jumunjin standard sand by triaxial compression tests", M.Sc. Dissertation, Changwon National University, Changwon, Korea.
  2. Ahn, H.H., Choi, J.I., Shim, S.H. and Lee, S.W. (2008), "Behavior of closely-spaced tunnel according to separation distance using scaled model tests", J. Kor. Geotech. Soc., 24(7), 5-16.
  3. An, Y.K., Kong, S.M. and Lee, Y.J. (2014), "Assessment of minimum pillar width and reinforcement of parallel tunnel using numerical analysis and field monitoring", J. Kor. Tunn. Undergr. Sp. Assoc., 16(3), 299-310. https://doi.org/10.9711/KTAJ.2014.16.3.299.
  4. Atkinson, J.H. (2007), The Mechanics of Soils and Foundations, Taylor & Francis Group, 2nd edition, 12-407.
  5. Bulter, H.D. and Hoy, H.E. (1997), "User's Manual for the Texas quick load method for foundation load testing", FHWA-IP-77-8, Federal Highway Administration, Office of Development, Washington, U.S.A. 9-46.
  6. Chehade, F.H. and Shahrour, I. (2008), "Numerical analysis of the interaction between twin-tunnels: Influence of the relative position and construction procedure", Tunn. Undergr. Sp. Technol., 23(2), 210-214. https://doi.org/10.1016/j.tust.2007.03.004.
  7. Choi, M.K. (2017), "The effects of excavation of divergence tunnel from double-deck tunnel on stability of underground common Duct", M.Sc. Dissertation, Hanyang University, Seoul, Korea.
  8. Das, B.M. (2010), Principles of Geotechnical Engineering, Cengage Learning, Seventh Edition, 296-301.
  9. Das, B.M. (2011), Principles of Foundation Engineering, Cengage Learning, Seventh Edition, 535-556.
  10. Do, N.A., Dias, D., Oreste, P. and Djeran-Maigre, I. (2014), "Three-dimensional numerical simulation of a mechanized twin tunnels in soft ground", Tunn. Undergr. Sp. Technol., 42, 40-51. https://doi.org/10.1016/j.tust.2014.02.001.
  11. Ghaboussi, J. and Ranken, R.E. (1977), "Interaction between two parallel tunnels", Int. J. Numer. Anal. Meth. Geomech., 1(1), 75-103. https://doi.org/10.1002/nag.1610010107.
  12. Han, Y.C., Kim, S.H. and Jeong, S.S. (2014), "Ground behavior around tunnel using tunnel-shaped trapdoor model test", J. Kor. Geotech. Soc., 30(4), 65-80. https://doi.org/10.7843/kgs.2014.30.4.65
  13. Han, Y.C., Lim, H.S. and Jeong, S.S. (2014), "The strength and deformation characteristics of Jumunjin sand under low confining stresses", J. Kor. Geotech. Soc., 30(2), 33-42. https://doi.org/10.7843/kgs.2014.30.2.33.
  14. Hong, S.K., Oh, D.W., Kong, S.M. and Lee, Y.J. (2019), "Behaviour of serviced tunnel and surrounding ground based on offset from divergence tunnel", Proceedings of the 2019 World Congress on Advances in Structural Engineering and Mechanics (ASEM19), Jeju, Korea, September.
  15. Im, J.C., Lee, T.H. and An, M.H. (2000), "A study on the estimation of internal friction angle of sand ground through the bearing capacity experiment", J. Kor. Soc. Civ. Eng. C, 20(6C), 495-506.
  16. Jeon, Y.J., Kim, S.H., Kim, J.S. and Lee, C.J. (2017), "A study on the effects of ground reinforcement on the behaviour of preexisting piles affected by adjacent tunnelling", J. Kor. Tunn. Undergr. Sp. Assoc., 19(3), 389-407. https://doi.org/10.9711/KTAJ.2017.19.3.389.
  17. Jongpradist, P., Kaewsri, T., Sawatparnich, A. Suwansawat, S., Youwai, S., Kongkitkul, W. and Sunitsakul, J. (2013), "Development of tunneling influence zones for adjacent pile foundations by numerical analysis", Tunn. Undergr. Sp. Technol., 34, 96-109. https://doi.org/10.1016/j.tust.2012.11.005.
  18. Kang, J.G., Lee, C.K. and Lee, K.I. (2015), "Numerical analysis of rock pillar in tunnel diverging area", J. Kor. Geosynth. Soc., 14(2), 81-88. https://doi.org/10.12814/jkgss.2015.14.2.081.
  19. Kim, H.E., Kim, J.J., Lee, J.K. and Yoo, H.K. (2017), "Stability analysis of an existing tunnel due to the excavation of a divergence tunnel emerging from double-deck tunnel", J. Kor. Tunn. Undergr. Sp. Assoc., 19(5), 779-797. https://doi.org/10.9711/KTAJ.2017.19.5.779.
  20. Kim, Y.S., Ko, H.W., Kim, J.H. and Lee, J.G. (2012), "Dynamic deformation characteristics of Joomunjin standard sand using cyclic triaxial test", J. Kor. Geotech. Soc., 28(12), 53-64. https://doi.org/10.7843/kgs.2012.28.12.53.
  21. Kong, S.M. and Lee, Y.J. (2016), "A study on soil behaviour due to tunnelling under embedded pile using close range photogrammetry", J. Kor. Tunn. Undergr. Sp. Assoc., 18(4), 365-376. https://doi.org/10.9711/KTAJ.2016.18.4.365.
  22. La, Y.S. (2019), "A study on stability of double deck tunnels with a divergence section", Ph.D. Dissertation, Dongguk University, Seoul, Korea.
  23. La, Y.S. and Kim, B.J. (2016), "Effect of separation between main and divergent tunnels in divergence section of double-deck tunnel on the stability", J. Kor. Geosynth. Soc., 15(2), 45-54. https://doi.org/10.12814/jkgss.2016.15.2.045.
  24. Lambe, T.W. and Whiman, R.V. (1979), Soil Mechanics, John Wiley & Son, SI Version, 29-148.
  25. Lee, C.K., Lee, K.I. and Kang, J.G. (2016), "An assessment of rock pillar stability in tunnel asymmetric diverging area using the Mohr-Coulomb failure theory", J. Kor. Geosynth. Soc., 15(4), 17-23. https://doi.org/10.12814/jkgss.2016.15.4.017.
  26. Lee, H.G. (2017), "Investigation of ground behaviour according to ground water locations due to tunnelling under shallow foundation in sand", M.Sc. Dissertation, Seoul National University of Science and Technology, Seoul, Korea.
  27. Lee, J.H. (2014), "Model tunnel excavation using close range photogrammetric technique for tunnel roof reinforcement", M.Sc. Dissertation, Seoul National University of Science and Technology, Seoul, Korea.
  28. Lee, J.H. (2019), "A comparative study of measurement on ground behaviour using close range photogrammetry and image processing", M.Sc. Dissertation, Seoul National University of Science and Technology, Seoul, Korea.
  29. Lee, Y.J. (2007), "Assessment of tunnel collapse load by closed-form analytical solution and finite element analysis", J. Kor. Geotech. Soc., 23(4), 185-197.
  30. Nam, K.M., Choi, M.K., Kim, J.J., Jafri, T.H. and Yoo, H.K. (2017), "Stability analysis of an existing utility tunnel due to the excavation of a divergence tunnel emerging from double-deck tunnel", J. Kor. Tunn. Undergr. Sp. Assoc., 19(2), 231-248. https://doi.org/10.9711/KTAJ.2017.19.2.231.
  31. Oh, D.W., Ahn, H.Y. and Lee, Y.J. (2018), "Behaviour of vertically and horizontally loaded pile and adjacent ground affected by tunneling", Geomech. Eng., 15(3), 861-868. https://doi.org/10.12989/gae.2018.15.3.861.
  32. Park, Y.J., Jang, N.J., Kim, K.H. and Choi, C.R. (2018), "A study on the stability analysis for double deck tunnel branch geometry", J. Kor. Tunn. Undergr. Sp. Assoc., 20(2), 393-404. https://doi.org/10.9711/KTAJ.2018.20.2.393.
  33. PLAXIS AE (2016), Reference Manual, Plaxis, 80-84.
  34. Xie, J., Gunn, M.J. and Rahim, A. (2004), "Collapse analysis for two parallel circular tunnels with different diameters in soil", Proceedings of the 9th International Symposium on Numerical Models in Geomechanics-NUMOG IX, Ottawa, Canada, August.
  35. Yoo, C.S. and Song, A.R. (2006), "Effects of tunnel construction on an existing tunnel lining", J. Kor. Tunn. Undergr. Sp. Assoc., 8(4), 307-324.
  36. You, K.H., Jin, S.H. and Kim, Y.J. (2017), "A stability study of deep and double-deck tunnels considering shape and reinforcing method of an enlarged section by using numerical analyses", J. Kor. Tunn. Undergr. Sp. Assoc., 19(1), 41-56. https://doi.org/10.9711/KTAJ.2017.19.1.041.

피인용 문헌

  1. Hoek-Brown failure criterion for damage analysis of tunnels subjected to blast load vol.26, pp.1, 2021, https://doi.org/10.12989/gae.2021.26.1.041