Geomechanics and Engineering

  • 제21권2호
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  • Pages.171-178
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  • 2020
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Deformation characteristics of tunnel bottom after construction under geological conditions of long-term deformation

  • Kim, Nag-Young (Institute of Research, Korea Expressway Corporation) ;
  • Park, Du-Hee (Department of Civil and Environment Engineering Hanyang University) ;
  • Jung, Hyuk-Sang (Department of Railway Construction and Safety Engineering, Dongyang University) ;
  • Kim, Myoung-Il (Department of Civil and Environment Engineering Hanyang University)
  • 투고 : 2019.12.04
  • 심사 : 2020.03.03
  • 발행 : 2020.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Mountainous areas cover more than 70% of Korea. With the rapid increase in tunnel construction, tunnel-collapse incidents and excessive deformation are occurring more frequently. In addition, longer tunnel structures are being constructed, and geologically weaker ground conditions are increasingly being encountered during the construction process. Tunnels constructed under weak ground conditions exhibit long-term deformation behavior that leads to tunnel instability. This study analyzes the behavior of the bottom region of tunnels under geological conditions of long-term deformation. Long-term deformation causes various types of damage, such as cracks and ridges in the packing part of tunnels, as well as cracks and upheavals in the pavement of tunnels. We observed rapid tunnel over-displacement due to the squeezing of a fault rupture zone after the inflow of a large amount of groundwater. Excessive increments in the support member strength resulted in damage to the support and tunnel bottom. In addition, upward infiltration pressure on the tunnel road was found to cause severe pavement damage. Furthermore, smectite (a highly expandable mineral), chlorite, illite, and hematite, were also observed. Soil samples and rock samples containing clay minerals were found to have greater expansibility than general soil samples. Considering these findings, countermeasures against the deformation of tunnel bottoms are required.

키워드

참고문헌

  1. Chang, Y.C., Kim, N.Y., Jin, K.D. and Son, Y.M. (2014), "Upheaval behaviour of tunnel bottom in the weathered fracture zone under tunnel excavation", J. Kor. Geo-Environ. Soc., 15(6), 49-56. https://doi.org/10.14481/jkges.2014.15.6.49.
  2. Korea Expressway Corporation (2002), Stability of Tunnel Bottom.
  3. Korea Expressway Corporation (2012), Stability of Tunnel under Construction.
  4. Laver, R., Li, Z. and Soga, K. (2016), "Method to evaluate the long-term surface movements by tunnelling in London clay", J. Geotech. Geonviron. Eng., 143(3). https://doi.org/10.1061/(ASCE)GT.1943-5606.0001611.
  5. Li, Z., Soga, K. and Wright, P. (2015), "Long-term performance of cast-iron tunnel cross passage in London clay", Tunn. Undergr. Sp. Technol., 50, 152-170. https://doi.org/10.1016/j.tust.2015.07.005.
  6. Nakano, R. (1974), "On the design of water tunnels in relation with the type and magnitude of rock load with special references to the mechanism and prediction of squeezing-swelling rock pressure", Bull. Natl. Res. Inst. Agr. Eng., 12, 89-142.
  7. Shen, S., Wu, H., Cui, Y. and Yin, Z. (2014), "Long-term settlement behaviour of metro tunnels in the soft deposits of Shanghai", Tunn. Undergr. Sp. Technol., 40, 309-323. https://doi.org/10.1016/j.tust.2013.10.013.
  8. Son, Y.M., Kim, N.Y. and Min, G.J. (2015), "A study on behaviour of tunnel considering the location of groundwater leaching and fault fracture zone under tunnel construction", J. Kor. Geo-Environ. Soc., 16(12), 37-43. https://doi.org/10.14481/jkges.2015.16.12.37.
  9. Wongsaroj, J., Soga, K. and Mair, R.J. (2013), "Tunneling-induced consolidation settlements in London Clay", Geotechnique, 63(13), 1103-1115. https://doi.org/10.1680/geot.12.P.126.
  10. Yang, X. L., Xu, J.S., Li, Y.X. and Yan, R.M. (2016), "Collapse mechanism of Tunnel roof considering joined influences of nonlinearity and non-associated flow rule", Geomech. Eng., 10(1), 21-35. https://doi.org/10.12989/gae.2016.10.1.021.
  11. Yang, X.L. and Li, K.F. (2016), "Roof collapse of shallow Tunnel in layered Hoek-Brown rock media", Geomech. Eng., 11(6), 867-877. https://doi.org/10.12989/gae.2016.11.6.867.
  12. Yang, X.L. and Yan, R.M. (2015), "Collapse mechanism for deep Tunnel subjected to seepage force in layered soils", Geomech. Eng., 8(5), 741-756. https://doi.org/10.12989/gae.2015.8.5.741.
  13. Yang, X.L. and Zhang, R. (2017), "Collapse analysis of shallow tunnel subjected to seepage in layered soils considering joined effects of settlement and dilation", Geomech. Eng., 13(2), 217-235. https://doi.org/10.12989/gae.2017.13.2.217.
  14. Yoo, C. (2016), "Effect of spatial characteristics of a weak zone on tunnel deformation behavior", Geomech. Eng., 11(1), 41-58. https://doi.org/10.12989/gae.2016.11.1.041.
  15. Zheng, G., Du, Y., Cheng, X., Diao, Y., Deng X. and Wang, F. (2017), "Characteristics and prediction methods for tunnel deformations induced by excavations", Geomech. Eng., 12(3), 361-397. https://doi.org/10.12989/gae.2017.12.3.361.

피인용 문헌

  1. Effects of the borehole drainage for roof aquifer on local stress in underground mining vol.24, pp.5, 2020, https://doi.org/10.12989/gae.2021.24.5.479