DOI QR코드

DOI QR Code

Evaluation of the backfill injection pressure and its effect on ground settlement for shield TBM using numerical analysis

쉴드 TBM 뒤채움압 산정 및 침하영향에 대한 수치해석적 연구

  • 안창균 (건국대학교 사회환경공학과) ;
  • 유정선 (건국대학교 사회환경공학과) ;
  • 이석원 (건국대학교 사회환경공학과)
  • Received : 2018.01.05
  • Accepted : 2018.02.07
  • Published : 2018.03.31

Abstract

Backfill injection pressure in shield TBM affects not only ground settlement but also adjacent underground structures. Therefore, it is essential to estimate a suitable backfill injection pressure in advance in design stage. In this paper, seven suggested equations worldwide to calculate the backfill injection pressure were reviewed and compared. By assuming 6 cases of virtual ground condition, backfill injection pressures were calculated and analyzed. it was confirmed that the backfill injection pressure increases as the depth of overburden increases, but the increasing ratio decreases. The numerical analysis was carried out by applying the calculated backfill injection pressure to investigate the influence of backfill injection pressure on the settlement of surface and crown of tunnel. It was confirmed that the final settlement at the surface and crown of tunnel on the both unsaturated and saturated condition are more influenced by the applied face pressure than the applied backfill injection pressure. In addition, the effect of backfill injection pressure decreases as the depth of overburden increases, and the effect of backfill injection pressure increases as the applied face pressure decreases.

Acknowledgement

Grant : 고수압 초장대 해저터널 기술자립을 위한 핵심요소 기술개발

Supported by : 국토교통과학기술진흥원

References

  1. Anagnostou, G., Kovari, K. (1996), "Face stability conditions with earth-pressure-balanced shields", Tunnelling and Underground Space Technology, Vol. 11, No. 2, pp. 165-173. https://doi.org/10.1016/0886-7798(96)00017-X
  2. Biosca, F., Bono, R. (2008), "Construccion de la linea 9 del metro de Barcelona", Obras Urbanas Magazine, pp. 1-8.
  3. DIN 4085 (2011), "Baugrund-Berechnung des Erddrucks", pp. 1-22.
  4. Gatti, M.C., Cassani, G. (2007), "Ground loss control in EPB TBM Tunnel excavations", Underground space-the 4th dimension of metropolis, Proceedings of the world tunnel congress, Prague, pp. 1141-1146.
  5. Kim, K.H., Kim, H., Mun, C.H., Kim, Y.H., Kim, D.H., Lee, J.Y. (2017), "A study on the establishment of domestic criteria through analysis of shield TBM requirements in overseas ITB (Invitation to Bid)", Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 6, pp. 985-997. https://doi.org/10.9711/KTAJ.2017.19.6.985
  6. Lee, G.J., Kwon, T.H., Kim, K.Y., Song, K.I. (2017), "Relationship between brittleness index of hard rocks and TBM penetration rates", Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 4, pp. 611-634. https://doi.org/10.9711/KTAJ.2017.19.4.611
  7. Lovera, V. (2010), "Tunnelling with full face shield machines: study of the backfill of the tail void", Ph.D. Thesis, Central University of Venezuela, pp. 31-49.
  8. Mollon, G., Dias, D., Soubra, A.H. (2013), "Probabilistic analyses of tunneling-induced ground movements", Acta Geotechica, Vol. 8, No. 2, pp. 181-199. https://doi.org/10.1007/s11440-012-0182-7
  9. Murayama, S. (1966), "Review of excavation performance of mechanized shield from viewpoint of soil mechanics", Proceedings of the 1st Japan National Conference on Soil Mechanics and Foundation Engineering, pp. 12-17.
  10. Peila (2010), "Personal communication".
  11. Ramirez (2010), "Personal communication".
  12. Seong, J.H., Youn, J.U. (2017), "Identification and importance analysis of hazards affecting the stability of TBM tunnelling works", Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 6, pp. 973-983. https://doi.org/10.9711/KTAJ.2017.19.6.973
  13. Wittke, W. (2007), "Stability analysis and design for mechanized tunnelling", WBI-PRINT6, pp. 16-22.
  14. Yu, J.S. (2016), "Evaluation of the face pressure for slurry shield TBM", Master Thesis, Konkuk University, pp. 34-55.