Pillar load and ground deformation in 2-arch tunnel in the jointed rock mass

Sang-Duk Lee

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2007 Vol.9, Issue 1 Preview Page

Pillar load and ground deformation in 2-arch tunnel in the jointed rock mass 절리암반에서 2-Arch 터널의 필라하중과 지반변위

31 March 2007. pp. 91-97

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Abstract

Loads on the pillar and ground deformation in 2-arch tunnel, which is excavated in the rock mass with regular discontinuities, depending on the dips of discontinuities and the construction sequences were experimentally studied. Large scale model tests in the biaxial test facility were performed. Tested model (width 3.3m, height 3.0m, and length 0.45m) for 2-arch tunnel in 1/10 scale were built with various dips. Test results show that discontinuities have greate affects on the behavior of the 2-arch tunnel, especially on the pillar loads and ground deformation.

Keywords

2-Arch tunnel

construction sequences

pillar loads

ground deformation

절리가 존재하는 암반에서 2-Arch 터널을 굴착할 때 절리방향과 굴착단계에 따른 필라하중의 변화를 실험적으로 연구하였다. 이를 위해, 대형 모형 실험기(폭 3.3m, 높이 3.0m, 길이 0.45m)에 1/10 크기의 2-Arch 모형터널을 갖는 다양한 각도의 절리를 포함한 지반을 조성하고, 실제 시공과정을 따라 굴착하면서 터널굴착으로 인한 터널 주변지반의 변형을 측정하고, 굴착단계에 따라 필라에 작용하는 하중을 측정하였다. 계측된 데이터로부터 2-Arch 터널의 굴착에 따른 거동을 분석한 결과 절리의 각도에 따라 굴착단계별로 터널 주변지반의 변형 및 필라에 작용하는 하중이 크게 영향을 받는 것을 확인하였다.

키워드

2-Arch 터널

절리암반

터널굴착단계

필라하중

터널주변지반변형

References

1.이상덕, 전은숙 (2003), “사질토 지반에서 2-Arch 터널의 거동”, 한국터널공학회 논문집, Vol. 6, No. 2, pp. 171～182.

2.이상덕, 김홍문, 김찬웅, 홍용희 (2004), “라이닝 강성에 따른 2-Arch 터널 필라부의 거동”, 대한토목학회 전문학회세미나, Vol. 4H.

3.Duddeck, H., Erdmann, J. (1985), “On structural desi-gn models for tunnels in soft soil”, Underground Space, Vol. 9, Pergamon Press, pp. 246～259.

4.Lee, S. D. (2002), Influence of the discontinuity planes on the shallow tunnel, 28th ITA General Assembly and World Tunnel Congress, ITA, pp. 217～225.

5.Kouthabeloulis, N. C., Griffiths, D. V. (1989), “Numeri-cal modeling of the trap door problem”, Conf. Soil Mech. Found. Engng., Cambridge, Vol. 39. No. 1.

6.Matsuda, T. (1997), “A study on design methods for twin tunnel constructed by the single drift and central pier method”, Proceedings of Studies on Tunnel Engi-neering, Vol. 7.

7.Matsuda, T. (1998), “Ground behavior and settlement control of twin tunnels in soil ground”, Tunnels and Metropolises, pp. 1193～1198.

8.Terzaghi, K. (1936), “Stress distributionin dry and in saturated sand above a yielding trap-door”, Proc. 1st Int. Conf. Soil Mech. Found. Engng., Cambridge, Vol. 1.

9.Vardoulakis, I. (1981), “Trap-door problem with dry sand: A statical approach based upon model test kinema-tics”, Int. J. Num. Analy. Meth. Geomech., Vol. 5.

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 : 9
No :1
Pages :91-97

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

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