All Issue

2018 Vol.20, Issue 2 Preview Page
Numerical investigation on the effect of backfill grouting on ground behavior during shield TBM tunneling in sandy ground

사질토 지반을 통과하는 쉴드 TBM에서 뒤채움 그라우팅이 지반 거동에 미치는 영향에 대한 수치해석적 연구

Ju-Young Oh1
,
Hyunku Park2*
,
Seokbue Chang2
,
Hangseok Choi3
오 주영1
,
박 현규2*
,
장 석부2
,
최 항석3
1Manager, Infrastructure Division, Samsung C&T Corporation
2Director, Infrastructure Division, Samsung C&T Corporatio
3Professor, School of Civil, Environmental and Architectural Engineering, Korea University
1기상청 지진화산센터 연구원
2한국건설기술연구원 지반연구소 신진연구원
3한국건설기술연구원 지반연구소 수석연구원
*교신저자. *Corresponding Author. 
31 March 2018. pp. 375-392
PDF XML Citation
Abstract

The shield TBM method is widely adopted for tunneling works in urban area because it has more beneficial ways to control settlement at ground surface than conventional mined tunneling. In the shield tunneling, backfill grouting at tail void is crucial because it is supposed not only to restraint ground deformation around tail void during excavation but also to compensate precedent ground settlement by pushing up the ground with highly pressurized grout. However, the tail void grouting has been found to be ineffective for settlement compensation particularly in sandy ground, which might be caused by complicate interaction between ground and tail void grouting. In this paper, the effects of tail void grouting on behavior of ground in shield TBM tunneling were investigated based on 3-dimensional finite element analyses. The results of numerical analyses indicated that backfill grouting actually reduces settlement by degrading settlement increasing rate in excavation, which means decrease of volume loss. Meanwhile, the grouting could not contribute to compensate the precedent settlement, because reduction of volume loss by grouting was found to be counterbalanced by volume change of ground.

Keywords
Shield TBM
Backfill grouting
Sandy ground
Surface settlement
Volume loss

쉴드 TBM 공법은 터널의 변형을 최소화할 수 있는 공법으로 도심지 얕은 터널 공사에 적합한 공법이다. 하지만 이러한 쉴드 TBM 공법의 장점에도 불구하고 침하가 발생하며, 토피가 낮은 지반에서 쉴드 TBM 굴진 중 침하에 대한 대책은 여전히 주요 쟁점사항 중 하나로 남아있다. 쉴드 TBM 공법에서 테일 보이드는 불가피하게 발생하는 공간으로 테일 보 이드의 변형은 침하의 주요 원인이 된다. 이러한 테일 보이드의 변형은 뒤채움 그라우팅을 통해 제어되며, 이를 통해 침 하를 억제하거나 회복시킬 수 있다고 여겨지고 있다. 하지만 실제 뒤채움 그라우팅을 통한 침하 회복은 기대하기 어려우 며 특히 사질토에서 두드러진다. 이는 뒤채움 그라우팅과 사질토 지반 사이의 상호작용에 기인한 것으로 유추할 수 있다. 본 연구에서는 3차원 수치해석을 통해 사질토 지반에서 뒤채움 그라우팅이 지반거동에 미치는 영향을 파악하고자 하였 다. 해석결과, 뒤채움 그라우팅은 침하증가율을 감소시켜 쉴드 TBM 굴진으로 인하 침하를 감소시키나, 그라우팅 이전 에 발생한 침하를 회복시키지는 못하는 것으로 나타났다. 이는 뒤채움 그라우팅으로 인해 감소된 체적손실의 지표침하 감소 효과를 지반 내 체적변형이 상쇄하기 때문인 것으로 나타났다.

키워드
쉴드 TBM
뒤채움 그라우팅
사질토
지표침하
체적손실
References
1
ABAQUS (2011), “Abaqus/Standard v.6.11, User Manual”, Hibbit, Karlsson & Sorensen, Inc.
2
Ata, A.A. (1996), “Ground settlements induced by slurry shield tunnelling in stratified soils”, Proceedings of the North American Tunnelling ’96, Vol. 1, pp. 43-50.
3
Attewell, P.B. (1978), “Large ground movements and structures, Chapter: ground movements caused by tunnelling in soil”, Pentech Press, pp. 812-948.
4
Bezuijen, A., Talmon, A.M. (2003), “Grout the foundation of a bored tunnel”, Proceedings of the International Conference on Foundations Innovations, Observations, Design & Practice (ICOF 2003 Dunde), London, pp. 95-100.
5
Gu, B.H., Park, E.T. (1997), “EPB shield tunnelling in sand”, Proceedings of the KGS Spring ’97 National Conference, Korea, pp. 113-124.
6
Han, Y.W., Zhu, W., Zhong, X.C., Jia, R. (2007), “Experimental investigation on backfill grouting deformation characteristics of shield tunnel in sand”, Underground Space - the 4th Dimension of Metropolises, London, Taylor & Francis Group, pp. 303-306.
7
Hansmire, W.H., Cording, E.J. (1985), “Soil tunnel test section: case history summary”, Journal of Geotechnical Engineering, Vol. 111, No. 11, pp. 1301-1320.
8
Jancsecz, S., Frietzsche, W., Breuer, J., Ulrichs, K.R. (2001), “Minimierung von Senkungen beim Schildvortrieb am Beispiel der U-Bahn Düsseldorf”, Taschenbuch für den Tunnelbau, pp. 165-214.
9
Jun, G.C., Kim, D.H. (2016), “A interaction on the estimating shield TBM tunnel face pressure through analytical and numerical analysis”, Journal of Korean Tunnelling and Underground Space Association, Vol. 18, No. 3, pp. 273-282.
10
Lanier, J., di Prisco, C., Nova, R. (1991), “Etude expérimentale et analyse théorique de l’anisotropie induite du sable d'Hostun”, Revue Française de Géotechnique, Vol. 57, pp. 59-74.
11
Leca, E., New, B. (2007), “ITA/AITES Report 2006 on Settlements induced by tunneling in soft ground”, Tunnelling and Underground Space Technology, Vol. 22, No. 2, pp. 119-149.
12
Mähr, M. (2006), “Ground movements induced by shield tunneling in non-cohesive soils”, Logos Verlag Berlin, pp. 1-163.
13
Mair, R.J., Taylor, R.N. (1997), “Theme lecture: bored Tunnelling in the urban environment”, Proceedings of the 14th International Conference on Soil Mechanics and Foundation Engineering, Vol. 4, pp. 2353-2385.
14
Marshall, A.M., Farrell, R., Klar, A., Mair, R. (2012), “Tunnels in sands: the effect of size, depth and volume loss on greenfield displacements”, Géotechnique, Vol. 62 , No. 5, pp. 385-399.
15
Meschke, G., Kropik, C., Mang, H.A. (1996), “Numerical analyses of tunnel lining by means of a viscoplastic model for shotcrete”, International Journal for Numerical Methods in Engineering, Vol. 39, No. 18, pp. 3145-3162.
16
Mo, H.H., Chen, J.S. (2008), “Study on inner force and dislocation of segments caused by shield machine attitude”, Tunnelling and Underground Space Technology, Vol. 23, No. 3, pp. 281-291.
17
Moh, Z.C., Ju, D.H., Hwang, R.N. (1996), “Ground movements around tunnels in soft ground. Proceedings of the International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, London, pp. 311-315.
18
Oh, J.Y., Park, H., Kim, D., Chang, S., Lee, S., Choi, H. (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”, Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 2, pp. 265-281.
19
Park, H., Oh, J.Y., Chang, S., Lee, S. (2016), “Case study of volume loss estimation during slurry TBM tunnelling in weathered zone of granite rock”, Journal of Korean Tunnelling and Underground Space Association, Vol. 18, No. 1, pp. 61-74.
20
Suwansawat, S. (2002), “Earth pressure balance (EPB) shield tunneling in Bangkok: ground response and prediction of surface settlements using artificial neutral networks”, Doctoral Dissertation, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, pp. 35-595.
Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 20
  • No :2
  • Pages :375-392
  • Received Date : 2018-01-29
  • Revised Date : 2018-02-26
  • Accepted Date : 2018-03-05
  • DOI :https://doi.org/10.9711/KTAJ.2018.20.2.375
Journal Informaiton Journal of Korean Tunnelling and Underground Space Association Journal of Korean Tunnelling and Underground Space Association
Online Submission & Review System
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close