A Study on Determination of the Optimum Round Length for Weak Rock Tunnel

Young-Zoo* Lee; Chang-Yong Kim; Kwang-Yeom Kim; Sung-Won Lee; Wulf Schubert

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2006 Vol.8, Issue 3 Preview Page Next Page

A Study on Determination of the Optimum Round Length for Weak Rock Tunnel 연암터널의 최적 굴진장 결정에 관한 연구

30 September 2006. pp. 219-225

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Abstract

Although the round length for tunnel excavation has a major technical and economical impact in conventional tunnelling, there is no coherent procedure available for its determination. In this study, the influence of round length on the behaviour modes of weak rock tunnel was investigated by numerical analyses. Quantitative estimation of the behaviour modes of the face and the unsupported span was established by use of the safety factor for the face stability and the conditional chart. In addition, the optimum round length in the tunnel design stage was investigated based on the detail construction information such as cycle time and material costs. Although this proposed method has some restrictions, it is expected to provide useful information for the optimization of the tunnel excavation, especially in design stage.

Keywords

Round length

behaviour mode

safety factor

optimization

터널시공에 있어서 굴진장은 기술적인 면뿐만이 아니라 경제적인 면에서도 큰 영향을 끼치지만 현재까지 굴진장 결정을 위한 일관된 절차는 연구되지 않았다. 본 연구에서는 수치해석을 통해 굴진장이 연암터널의 거동형태에 끼치는 영향을 알아보았다. 터널 막장과 무지보구간의 거동형태를 막장안전률과 설계차트를 이용해 정량적으로 판단할 수 있도록 하였으며, 설계단계에서의 최적 굴진장을 사이클타임과 공사비 등의 시공자료를 이용해 분석하였다. 비록 본 연구결과가 몇몇 적용한계를 가지고 있지만 설계단계에서 터널 굴착을 최적화하기 위한 정보를 제공할 수 있다.

키워드

굴진장

거동형태

안전율

최적화

References

1.Chambon, P. and Corte, J. F.(1994), “Shallow tunnels in cohesionless soil : stability of tunnel face”, J. of Geotech. Engng. Vol. 120, No.7, pp. 1148 -1165.

2.Vermeer, P. A., Ruse, N., Marcher, T.(2002), “Tunnel heading stability in drained ground”, Felsbau 20, No.6, pp. 8-18.

3.Lee, Y. Z., Schubert, W. and Kim, C. Y.(2005), “The influence of the round length on the stability of tunnel face and unsupported span”, Proc. 31st ITA-AITES World Tunnel Congress, Istanbul, Tu-rkey, pp. 211-216.

4.Lee, Y. Z., Schubert, W. and Kim, C. Y.(2006), “Op-ti-mization of the round length in design stage for tunnel excavation in weak rock”, Proc. 4th Asian Rock Mechanics Symposium, Singa-pore, (to be published).

5.이영주, 김창용, 김광염, W. Schubert(2006), 연암터널의 막장 및 무지보 구간의 거동형태에 관한 연구, 터널과 지하공간, 한국암반공학회,(to be published).

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 :3
Pages :219-225

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

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