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

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
권호 표지
DOI QR코드

DOI QR Code

A study on numerical modeling method considering gap parameter and backfill grouting of the shield TBM tunnel

쉴드 TBM 터널의 gap parameter와 뒤채움재를 고려한 수치모델링 방법에 대한 연구

  • You, Kwang-Ho (School of Civil Environment Energy Eng., Univ. of Suwon) ;
  • Kim, Young-Jin (School of Civil Environment Energy Eng., Univ. of Suwon)
  • 유광호 (수원대학교 건설환경에너지공학부) ;
  • 김영진 (수원대학교 건설환경에너지공학부)
  • Received : 2017.08.21
  • Accepted : 2017.09.19
  • Published : 2017.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Backfill grouting and realistic convergence distribution were not properly considered in previous studies on 2D numerical analysis of a shield TBM tunnel. In this study, a modeling method was suggested to cope with this problem by considering a realistic convergence distribution and proper properties of backfill grouting. To this end, the influence of gap parameter and depth of rock cover on volume loss and composed of ground volume loss around tunnel excavation and surface volume loss were analyzed with a single layer of weathered soil. As a result, most of surface settlements were occurred immediately after excavation. Additional, as depth of rock cover and gap parameter increased, the influence range of surface settlement curves obtained from 2D numerical analyses became broader than a suggested theoretical equation. Therefore, it is inferred that gap parameter should be applied based on load distribution ratio and the property of backfill grouting properly considered for the estimation of the precise behavior of a shield TBM tunnel in 2D numerical analysis.

쉴드 TBM 터널에 대한 2차원 수치해석 시 기존 연구에서는 뒤채움재 및 실제적인 내공변위 분포를 적절히 고려하지 않았다. 따라서 본 연구에서는 이를 보완하고자 gap parameter 적용 시 굴착면에서 발생하는 실제적인 내공변위분포를 고려하고, 적정한 뒤채움재 물성치를 적용한 모델링 방법을 제시하였다. 이를 위해 단일층 풍화토 지반을 대상으로 gap parameter와 토피고가 굴착면의 지반손실량과 지표손실량으로 구성되는 체적손실량에 미치는 영향을 분석하였다. 그 결과 대부분의 지표침하가 굴착 직후에 발생하였으며, 토피고 및 gap parameter가 증가할수록 수치해석을 통해 얻은 지표침하곡선의 영향범위가 제안된 이론식보다 넓게 나타났다. 따라서 2차원 수치해석 시 쉴드 TBM 터널의 거동을 정확히 평가하기 위해서는 하중분담률을 이용하여 gap parameter를 적용하고, 뒤채움재의 물성치도 적절히 고려해야 한다고 판단된다.

Keywords

References

  1. Chi, S.Y., Chern, J.C., Lin, C.C. (2001), "Optimized back-analysis for tunneling-induced ground movement using equivalent ground loss model", Tunnelling and Underground Space Technology, Vol. 16, No. 3, pp. 159-165. https://doi.org/10.1016/S0886-7798(01)00048-7
  2. Cho, J.S. (2008), "Analysis of ground movements and lining segment in shield TBM based on Three dimensional finite element method", Master's Dissertation, Pukyong National University, 58p.
  3. Cording, E.J. (1991), "Control of ground movements around tunnels in soil", 9th Pan American Conference, Vina del Mar, Chile. Vol. 4, pp. 2195-2244.
  4. Joo, H.S. (2016), Geoinformatics, Korean Studies Information, 865p.
  5. Koh, S.Y., Kwon, S.J., Hwang, C.H., Kim, S.I., Choo, S.Y. (2011), "A study on gap parameter and influence area of ground settlement using back analysis constructed by shield TBM with shallow depth", 2011 Spring Annual Conference of the Korean Society for Railway, pp. 1509-1518.
  6. Lee, K.M., Rowe, R.K. (1992), "Subsidence owing to tunnelling. II. Evaluation of a prediction technique", Canadian Geotechnical Journal, Vol. 29, pp. 941-954. https://doi.org/10.1139/t92-105
  7. Nam, K.M., Choi, M.K., Kim, J.J., Turab, H.J., Yoo, H.K. (2017), "Stability analysis of an existing utility tunnel due to the excavation of a divergence tunnel emerging from double-deck tunnel", Korean Tunneling and Underground Space Association, Vol. 19, No. 2, pp. 231-248. https://doi.org/10.9711/KTAJ.2017.19.2.231
  8. O'Reilly, M.P., New, B.M. (1982), "Settlements above tunnels in the United Kingdom - their magnitude and effects", Tunnelling '82, M. J. Jones, ed., London, England, pp. 173-181.
  9. Oh, J.Y., Park, H.K., Kim, D.Y., Chang, S.B., Lee, S.B., Choi, H.S. (2017), "Study on the effect of tail void grouting on the short- and long-term surface settlement in the shield TBM tunneling using numerical analysis", Korean Tunnelling and Underground Space Association, Vol. 19, No. 2, pp. 265-281. https://doi.org/10.9711/KTAJ.2017.19.2.265
  10. Peck, P.B. (1969), "Deep excavations and tunneling in soft ground", Proceeding of 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico City, State of-the-Art Report, pp. 225-290.
  11. Son, M.R., Yun, J.C. (2009), "Numerical analysis of tunnelling-induced ground movements", Korean Tunnelling and Underground Space Association, Vol. 11, No. 3, pp. 229-242.
  12. Western Metro (2016), "Final design of private infrastructure investment project on OO-OO double track railway (zone 4)", Tunnel Analysis Report, 906p.
  13. You, K.H., Jin, S.H., 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", Korean Tunneling and Underground Space Association, Vol. 19, No. 1, pp. 41-56. https://doi.org/10.9711/KTAJ.2017.19.1.041
  14. You, K.H., Kim, Y.J. (2017a), "Application of gap parameter for 2D numerical analysis of a shield TBM tunnel", 2017 Spring Annual Conference of Korean Tunnelling and Underground Space Association, pp. 47-48.
  15. You, K.H., Kim, Y.J. (2017b), "A comparative study with displacement controlled model on 2D numerical analysis of a shield TBM tunnel", KSCE 2017 Convention. (in press)
  16. You, K.H., Lee, M.H., Park, Y.J. (2007), "Comparison and validation on shotcrete modelling method for the quantitative stability estimation of a tunnel", Korean Tunneling and Underground Space Association, Vol. 9, No. 2, pp. 99-107.