Effects of Excavation Methods on Tunnel Deformation Behavior - A Numerical Investigation

Chung-Sik Yoo; Joo-mi Kim; Sun-Bin* Kim

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2006 Vol.8, Issue 4 Next Page

Effects of Excavation Methods on Tunnel Deformation Behavior - A Numerical Investigation 굴착공법이 터널변위 거동에 미치는 영향 - 수치해석 연구

31 December 2006. pp. 289-305

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Abstract

This paper presents the effect of excavating methods on tunnel behavior. As part of this study, it is preliminarily focused on the comparison of two different excavation methods, center diaphram (CD) method and ringcut (RC) method. Especially, the purpose of this research is to study the behavioral mechanism of two tunnels which share the same construction environment but different excavating method. Two numerical analysis models with the same tunnel section and material properties are compared in this study, and they are analyzed by 3D finite element analysis. In each model, face stability, crown displacement, ground settlement, and shotcrete-lining stress are computed, then the general behavior of CD method and RC method is studied. The results indicate that the CD method tends to be effective in controlling tunnel displacement while the RC method is more effective in controlling ground settlement. Design implications of the findings from this study are discussed.

Keywords

Tunnel excavation method

finite element analysis

ringcut method

center diaphram method

settlement

tunnel displacement

본 논문에서는 굴착공법이 터널변위 거동에 미치는 영향에 대한 내용을 다루었다. 먼저 비교적 동일한 시공조건을 대상으로 중벽분할 굴착공법과 링컷공법을 비교하여 각 굴착공법에 따른 터널거동 메카니즘을 고찰하는데 초점을 두었다. 이를 위해 3차원 유한요소해석을 수행하였으며, 각 공법별 해석결과로부터 막장 안정, 천단침하, 지표침하, 숏크리트 라이닝의 응력을 비교하였다. 전반적으로 중벽분할 공법을 적용할 경우 굴진과정에서 터널변위 제어에 탁월한 효과가 있는 것으로 나타났으며, 링컷공법 적용 시 지표침하 억제 효과에 보다 효율적인 것으로 나타났다. 본 연구결과를 종합하여 설계 시 고려하여야 할 주안점을 제시하였다.

키워드

터널굴착공법

유한요소해석

링컷 굴착공법

CD 굴착공법

지표침하

터널변위

References

1.ABAQUS Users Manual, Version 6.4. (2003). Hibbitt, Karlsson, and Sorensen, Inc., Pawtu-cket, Providence, R.I.

2.Farias, M. M., Moraes, A. H. and Assis, A. P. (2004), “Displacement control in tunnels excavated by the NATM : 3-D numerical simula-tions”, Tunnelling and Underground Space Technology, Vol. 19, pp. 283-293.

3.Galli, G., Grimaldi, A. and Leonard, A. (2004), “Three-dimensional modelling of tunnel exca-vation and lining”, Computers and Geotech-nics, Vol. 31, pp. 171-183.

4.Karakus, M. and Fowell, R. J. (2003), “Effect of different tunnel face advance excavation on the settlement by FEM”, Tunnelling and Under-ground Space Technology, Vol. 18, pp. 513- 523.

5.Karakus, M. and Fowell R. J. (2006), “2-D and 3-D finite element analyses for the settlement due to soft ground tunnelling”, Tunnelling and Underground Space Technology, Vol. 21, pp. 392.

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 : 8
No :4
Pages :289-305

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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