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

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Analysis on the behavior of shield TBM cable tunnel: The effect of the distance of backfill grout injection from the end of skin plate

뒷채움 주입 거리에 따른 전력구 쉴드 TBM 터널의 거동 특성 분석

  • Cho, Won-Sub (Department of Civil Engineering, Inha University) ;
  • Song, Ki-Il (Department of Civil Engineering, Inha University) ;
  • Ryu, Hee-Hwan (Power System Laboratory, KEPCO Research Institute)
  • Received : 2014.03.10
  • Accepted : 2014.03.21
  • Published : 2014.03.30
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Abstract

Recently, tunnelling with TBM is getting popular for the construction of cable tunnel in urban area. Mechanized tunnelling method using shield TBM has various advantages such as minimization of ground settlement and prevention of vibration induced by blasting that should be accompanied by conventional tunnelling. In Korea, earth pressure balance (EPB) type shield TBM has been mainly used. Despite the popularity of EPB shield TBM for cable tunnel construction, study on the mechanical behavior of cable tunnel driven by shield TBM is insufficient. Especially, the effect of backfill grout injection on the behavior of cable tunnel driven by shield TBM is investigated in this study. Tunnelling with shield TBM is simulated using 3D FEM. The distance of backfill grout injection from the end of shield skin varies. Sectional forces such as axial force, shear force and bending moment are monitored. Vertical displacement at the ground surface is measured. Futhermore, the relation between volume loss and the distance of backfill grout injection from the end of skin plate is derived. Based on the stability analysis with the results obtained from the numerical analysis, the most appropriate injection distance can be obtained.

최근, tunnel boring machine (TBM)을 이용한 도심지 지중 전력구 터널 건설이 증가하고 있다. 쉴드 TBM을 이용한 기계화 터널 굴착 공법은 재래식 공법에 비해 지반침하를 최소화 하고 발파에 의한 진동을 줄일 수 있는 장점이 있다. 국내에서는 earth pressure balance(EPB) 쉴드 TBM이 주로 사용되고 있다. 그러나 전력구 터널 굴착을 위한 쉴드 TBM 공법이 증가함에도 불구하고, 전력구 쉴드 TBM 터널의 거동 분석에 관한 연구는 미비한 실정이다. 본 연구에서는 후방주입 거리에 따른 전력구 쉴드 TBM 터널의 거동 특성을 분석하고, 굴착면 지반 손실과 후방주입 거리와의 상관관계를 도출하고자 한다. 쉴드 TBM을 이용한 터널 굴착은 3D FEM을 이용하여 시뮬레이션 하였다. 뒷채움 그라우트가 설치되는 거리의 변화에 따른 축력, 전단력, 휨 모멘트와 같은 단면력을 검토하고 지표면에서의 연직 변위를 분석하였다. 또한, 유한요소해석으로 얻어진 결과와 안정성 분석에 기초하여, 지반과 터널 구조물의 안정성을 확보할 수 있는 뒷채움재 주입시기를 결정할 수 있다.

Keywords

References

  1. ITA WG Mechanized Tunneling (2000), "Recommendations and Guidelines for Tunnel Boring Machines (TBMs)", pp. I-22-I-34.
  2. ITA-AITES WG "Research" (2007), "ITA/AITES report 2006 on settlements induced by tunneling in soft ground", Tunnelling and Underground Space Technology, Vol. 22, pp. 119-149. https://doi.org/10.1016/j.tust.2006.11.001
  3. Kang, T.H. (2013), "A study of earth pressure calculating method about shield TBM tunnel segments in the rock", Master Thesis, Hanyang University.
  4. Kim, J.Y. (2013), "EPB shield TBM tunnel construction -How to set the face pressure value and management for the stability of face-", Korean Geotechnical Society, Vol. 29, No. 2, pp. 21-27.
  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", 2013 Autumn Conference & Annual Meeting of the Korean Society for Railway, Vol. 14, No. 2, pp. 1509-1518.
  6. Lee, K.M., Rowe, R.K., Lo, K.Y. (1992), "Subsidence owing to tunnelling, I. estimating the gap parameter", Canada, Geotech. J., Vol. 29, pp. 929-941. https://doi.org/10.1139/t92-104
  7. Peck, R.B. (1969), "Deep excavations and tunneling in soft ground", Proceedings of the 7th international conference on Soil Mechanics and Foundation Engineering, Mexico City, State of the Art Volume, pp. 225-290.
  8. Schmidt, B. (1969), "Settlements and ground movements associated with tunneling in soils", PhD Thesis, University of Illinois.
  9. Snezana Maras-Dragojevic (2012), "Analysis of ground settlement caused by tunnel construction", Gradevinar, Vol. 64, No. 7, pp. 573-581.
  10. Son, M.R., Min, J.C. (2010), "Comparison of ground movements in a single ground layer and multiple ground layers due to nearby tunnel excavation", Korean Society of Civil Engineers, Vol. 30, No. 3-C, pp. 167-174.

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